Switch Disconnector
Fuse Switch Disconnector 3NP1
System Manual • 11/2008
SENTRON
Introduction 1
General information
2
Product description
3
Product line, product group
4
Product combinations
5
Functions, operation
6
Mounting and installation
7
Connection, wiring
8
Maintenance
9
Technical data
10
Dimensional drawings and
hole drilling templates
11
ESD guidelines
A
List of abbreviations
B
SENTRON
Switch disconnector
Fuse switch disconnector 3NP1
System Manual
11/2008
7112905-02DS01
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the corresponding information is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The device/system may only be set up and used in conjunction with this documentation. Commissioning and
operation of a device/system may only be performed by qualified personnel. Within the context of the safety notes
in this documentation qualified persons are defined as persons who are authorized to commission, ground and
label devices, systems and circuits in accordance with established safety practices and standards.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be adhered to. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this
publication may be trademarks whose use by third parties for their own purposes could violate the rights of the
owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
Ordernumber: 3ZX1012-0NP10-1AC1
Ⓟ 12/2008
Copyright © Siemens AG 2008.
Technical data subject to change
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 5
Table of contents
1 Introduction................................................................................................................................................ 7
2 General information ................................................................................................................................... 9
3 Product description.................................................................................................................................. 11
3.1 Functions, performance features, application areas, applications...............................................11
4 Product line, product group...................................................................................................................... 13
4.1 Frame sizes..................................................................................................................................13
4.2 Application areas .........................................................................................................................13
4.3 Types of mounting .......................................................................................................................14
4.4 Connection...................................................................................................................................17
4.5 Accessories..................................................................................................................................17
4.6 Product range, taking size 00 as an example..............................................................................18
4.7 Order number structure................................................................................................................24
5 Product combinations .............................................................................................................................. 25
5.1 Mounting onto a 40 mm busbar system.......................................................................................25
5.2 Mounting onto a 60 mm busbar system.......................................................................................26
5.3 Mounting onto a 60 mm busbar system with a bottom trough.....................................................27
5.4 Mounting in distribution boards....................................................................................................28
6 Functions, operation................................................................................................................................ 29
6.1 Auxiliary switches - purpose, number and settings of the switching instant................................29
6.2 Locking device .............................................................................................................................31
6.3 Electronic fuse monitoring............................................................................................................32
6.4 Mechanical fuse monitoring .........................................................................................................48
7 Mounting and installation ......................................................................................................................... 51
7.1 Mounting position of the 3NP1 fuse switch disconnector (all frame sizes)..................................51
7.2 Approved circuits .........................................................................................................................52
7.3 Mounting onto standard rails........................................................................................................53
7.4 Installation of the auxiliary switches.............................................................................................57
7.5 Installing and removing the LV HRC fuses ..................................................................................61
7.6 Mounting onto and dismantling from a busbar system ................................................................62
7.7 Conversion options for the cable outlet .......................................................................................65
7.8 Locking the 3NP1 fuse switch disconnector ................................................................................68
7.9 Knockout openings ......................................................................................................................69
Table of contents
Fuse switch disconnector 3NP1
6 System Manual, 11/2008, 7112905-02DS01
7.10 Sealing the fuse switch disconnector.......................................................................................... 71
8 Connection, wiring ................................................................................................................................... 73
8.1 Uncovering the cable connections .............................................................................................. 73
8.2 Connection types for the main and auxiliary conductors ............................................................ 76
8.3 Connection accessories .............................................................................................................. 78
8.4 Main conductor connection ......................................................................................................... 80
8.5 Auxiliary conductor connection ................................................................................................... 86
9 Maintenance ............................................................................................................................................ 87
10 Technical data ......................................................................................................................................... 89
11 Dimensional drawings and hole drilling templates ................................................................................... 93
A ESD guidelines ........................................................................................................................................ 99
B List of abbreviations............................................................................................................................... 101
Index...................................................................................................................................................... 103
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 7
Introduction 1
Purpose of the manual
The manual describes the basic functions of the "3NP1 fuse switch disconnector" range of
switching devices.
It contains information about
● Selection
● Configuring
● Commissioning
Required basic knowledge
A general knowledge of low-voltage controls and distribution is required to understand this
manual.
Used symbols
The following table explains the meaning of the various symbols used within this document:
Table 1- 1 Symbols:
Symbol Meaning
Solid cables without end sleeve
Solid cables with end sleeve
Finely stranded cables without end sleeve
Finely stranded cables with end sleeve
Necessary tools
Permissible tightening torque
Allen key
Hexagon socket head screw
"Phillips PH" cross-tip screwdriver
"Pozidrive PZ" cross-tip screwdriver
Slotted screwdriver
$
[% %
$
Layered conductors
Introduction
Fuse switch disconnector 3NP1
8 System Manual, 11/2008, 7112905-02DS01
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 9
General information 2
Degrees of protection
The maximum degree of protection of the fuse switch disconnector is IP40.
Definitions
Definition of fuse switch disconnectors
Fuse switch disconnectors are switching devices for occasional manual switching / isolation
of loads and distribution boards. They are capable of making, carrying, and breaking the
specified rated current (including a defined overload). They protect downstream electrical
loads, safely disconnecting all poles from the power supply under load.
Standards
IEC 60947-3 Low-voltage switchgear and controlgear (switch
disconnectors)
IEC 60947-3, Tables 6 and 7 EMC requirements
IEC 60269-2-1 Fuses
DIN 43620 Fuses
DIN 1759 Busbars
DIN 46433 Busbars
DIN EN 12167 Busbars
DIN EN 61140 Protection against electric shock
DIN VDE 0100-410 Erection of power installations - Protection for safety
DIN EN 60715 Standard mounting rails (TH35-15)
Requirements
Overload and short-circuit protection is provided for downstream devices / loads by inserting
LV HRC fuses, sizes 000 to 3, depending on the type of mounting.
Shock and vibration tests must be performed based on SN 31205. Shock and vibration tests
are additionally carried out according to the customer's requirements.
CE marking
All products described in this manual conform to the device-specific EC directives (see
below) and bear the CE mark ( ).
General information
Fuse switch disconnector 3NP1
10 System Manual, 11/2008, 7112905-02DS01
Directives
EC directives:
● Low-voltage directive
● EMC directive
● Machinery directive
Environmental compatibility
All materials used are environmentally compatible, taking account of "Hazardous
substances, list of prohibited substances, list of substances to be avoided" (SN 36350).
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 11
Product description 3
3.1 Functions, performance features, application areas, applications
Functions
The 3NP1 fuse switch disconnector is used to make, carry, and break rated currents up to
630 A.
The current is switched on and off by operating the handle unit.
Performance features
● 3-pole device versions
● 5 frame sizes from 160 A to 630 A
● Types of mounting: Floor mounting, mounting onto standard rail, mounting onto
40/60 mm busbar system
● Busbar systems: Siemens and Rittal
● Conversion option for cable outlet on the top or bottom without interfering with the internal
conducting paths
● Option of converting from a 5 mm busbar to a 10 mm busbar without non-captive or
breakable parts
● Busbar holders suitable for top mounting
● Reach-round protection for the busbar system as standard in case of mounting onto a
busbar system
● Connection types:
– Blade terminal
– Box terminal
– Saddle terminal
– Prism terminal
● Fuses can be unlocked and removed without contact
● Fuse monitoring:
– Mechanical
– Electronic
● Extended touch and reach-round protection with optional terminal covers
● Two auxiliary switches for indicating switch positions
● Locking option
● Sealing option
Product description
3.1 Functions, performance features, application areas, applications
Fuse switch disconnector 3NP1
12 System Manual, 11/2008, 7112905-02DS01
Table 3- 1 Versions, sizes, and types of mounting
Blade terminal Box terminal
Frame
size Basic
device
MFM EFM 10 EFM 20/2
5
Basic
device
MFM EFM 10 EFM 20/2
5
000 ✓ ✓ ✓
00 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
1 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
2 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Floor
mounting
3 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
000 ✓ ✓ ✓
00 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
1
2
Busbar
system 40
mm
3
000 ✓ ✓ ✓
00 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
1 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
2 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Busbar
system 60
mm
3 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Application areas
The 3NP1 fuse switch disconnector is suitable for the following branches of industry:
● Process and basic industries
● Manufacturing industry
● Infrastructure (building installations, supply and disposal)
● Mining
Applications
Industrial
● Fused combination motor controllers
● Combination with semiconductor fuse for fuse protection of frequency converters
● Fuse protection of distribution boards, cables, and leads
● Fuse protection in reactive-power compensation modules
Infrastructure
● Fuse protection of distribution boards, cables, and leads
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 13
Product line, product group 4
4.1 Frame sizes
3NP1 fuse switch disconnectors are available in the following frame sizes:
● Size 000
● Size 00
● Size 1
● Size 2
● Size 3
4.2 Application areas
Utilization category, rated operational voltage
The devices are suitable for use at up to 690 V AC and 440 V DC.
Installation points
The 3NP1 product range is primarily used in the following places:
● Distribution boards with standard system dimensions (e.g. 32 mm / 194 mm,
70 mm / 184 mm)
● Cabinets
● Mounting plates (free assembly)
● Busbar systems
Product line, product group
4.3 Types of mounting
Fuse switch disconnector 3NP1
14 System Manual, 11/2008, 7112905-02DS01
4.3 Types of mounting
Types of installation and mounting
Type of installation Frame size
Floor mounting 000, 00, 1, 2, 3
Mounting onto 40 mm busbar system 000, 00
Mounting onto 60 mm busbar system 000, 00, 1, 2, 3
Floor mounting, mounting onto Siemens busbar system, mounting onto Rittal busbar system, fuse
switch disconnector sizes 000 to 160 A
Product line, product group
4.3 Types of mounting
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 15
Floor mounting, mounting onto Siemens busbar system, mounting onto Rittal busbar system, fuse
switch disconnector sizes 00 to 160 A
Floor mounting, mounting onto Siemens busbar system, mounting onto Rittal busbar system, fuse
switch disconnector sizes 1 to 250 A
Product line, product group
4.3 Types of mounting
Fuse switch disconnector 3NP1
16 System Manual, 11/2008, 7112905-02DS01
Floor mounting, mounting onto Siemens busbar system, mounting onto Rittal busbar system, fuse
switch disconnector sizes 2 to 400 A
Floor mounting, mounting onto Siemens busbar system, mounting onto Rittal busbar system, fuse
switch disconnector sizes 3 to 630 A
Product line, product group
4.4 Connection
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 17
4.4 Connection
Connection types
Cable connections via box terminals are permissible for all frame sizes.
Flat connectors with blade terminals are available for size 00 to 3 fuse switch disconnectors.
Saddle or prism terminals can be supplied as optional accessories for the "blade terminal"
version.
Refer also to chapter 8 "Connection, wiring".
Conversion options
If necessary, all versions can be converted for a cable outlet on the top or bottom without
interfering with the internal conducting paths.
Refer to chapter 7.7 "Conversion options for the cable outlet".
4.5 Accessories
Optional accessories
● Mechanical fuse monitoring
● Electronic fuse monitoring
● Saddle terminals
● Prism terminals
● 3-phase busbars
● Auxiliary switches
● Auxiliary conductor terminals
● Terminal covers
● System panels
Refer also to chapter 4.6 "Product range, taking size 00 as an example".
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
18 System Manual, 11/2008, 7112905-02DS01
4.6 Product range, taking size 00 as an example
① SENTRON 3NP1 fuse switch disconnector ⑪ Box terminal
② Cover support ⑫ Auxiliary conductor terminal for box terminal
③ Reach-round protection for mounting onto Siemens busbar
system
⑬ Blade terminal
④ Reach-round protection for mounting onto Rittal busbar
system
⑭ Auxiliary conductor terminal for blade terminal
⑤ Locking device ⑮ Deep-drawn terminal module
⑥ Auxiliary switch with actuator ⑯ Prism terminal
⑦ Molded plastic cover ⑰ Auxiliary conductor terminal for prism terminal
⑧ Handle unit with mechanical fuse monitoring (MFM) ⑱ Saddle terminal
⑨ Handle unit with electronic fuse monitoring (EFM 10) ⑲ Terminal cover
⑩ Handle unit with electronic fuse monitoring (EFM 20/25) ⑳ Terminal cover with reach-round protection on the back
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 19
Reach-round protection for mounting onto Siemens 40 mm busbar system, taking size 00 as an
example
Reach-round protection for mounting onto Siemens 60 mm busbar system, taking size 00 as an
example
Reach-round protection for mounting onto Rittal 40/60 mm busbar system, taking size 00 as an
example
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
20 System Manual, 11/2008, 7112905-02DS01
Terminal cover with reach-round protection on the back for Siemens busbar system
Terminal cover with reach-round protection on the back and bottom cover for floor mounting, size 00
Cover support
Molded plastic cover, taking size 00 as an example
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 21
Standard handle unit
Handle unit with electronic fuse monitoring (EFM 10)
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
22 System Manual, 11/2008, 7112905-02DS01
Handle unit with electronic fuse monitoring (EFM 20/25)
Handle unit with mechanical fuse monitoring (MFM)
Product line, product group
4.6 Product range, taking size 00 as an example
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 23
Mounting kit for mounting a 3NP1 fuse switch disconnector between two standard rails, taking size 00
as an example
Locking device
Product line, product group
4.7 Order number structure
Fuse switch disconnector 3NP1
24 System Manual, 11/2008, 7112905-02DS01
4.7 Order number structure
Order number structure for the main devices
Order numbers for the main devices
Frame size
Poles
System environment
Type of c onnection
Fuse monitoring
Type of mounting
3N 1P1 1-......
Order number structure for accessories
Order numbers for accessories
Frame size
Poles
- Type of connection
- Device covers
- System panels
- Mounting kits
- Auxiliary switches
- Handle units
- Locking device
3N 9P1 1-......
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 25
Product combinations 5
5.1 Mounting onto a 40 mm busbar system
Mounting onto a 40 mm busbar system
Product combinations
5.2 Mounting onto a 60 mm busbar system
Fuse switch disconnector 3NP1
26 System Manual, 11/2008, 7112905-02DS01
5.2 Mounting onto a 60 mm busbar system
Mounting onto a 60 mm busbar system
Required product order (from right to left):
1. Fuse switch disconnectors, size 000 (3NP1123-1BC20)
2. Fuse switch disconnectors, size 00 (3NP1133-1BC10)
3. Fuse switch disconnectors, size 1 (3NP1143-1BC10)
4. Fuse switch disconnectors, size 2 (3NP1153-1BC10)
5. Fuse switch disconnectors, size 3 (3NP1163-1BC10)
Product combinations
5.3 Mounting onto a 60 mm busbar system with a bottom trough
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 27
5.3 Mounting onto a 60 mm busbar system with a bottom trough
Mounting onto a 60 mm busbar system with a bottom trough
Product combinations
5.4 Mounting in distribution boards
Fuse switch disconnector 3NP1
28 System Manual, 11/2008, 7112905-02DS01
5.4 Mounting in distribution boards
Floor mounting in distribution boards, sizes 000 and 00 / sizes 1, 2, 3
Busbar system mounting in distribution boards, sizes 000 and 00 / sizes 1 2, 3
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 29
Functions, operation 6
6.1 Auxiliary switches - purpose, number and settings of the switching
instant
Purpose of the auxiliary switches
Auxiliary switches are used to signal the switch position of the handle unit. They can also be
retrofitted if required.
Number of auxiliary switches per basic enclosure
One basic enclosure can accommodate up to two auxiliary switches (changeover contacts).
Auxiliary switch versions
● 1 changeover contact, version DB2
● 1 "solid-state compatible" changeover contact, version DB3
Functions, operation
6.1 Auxiliary switches - purpose, number and settings of the switching instant
Fuse switch disconnector 3NP1
30 System Manual, 11/2008, 7112905-02DS01
Switching instant settings for the auxiliary switches
You can set different switching instants (leading, lagging / simultaneously) for the auxiliary
switches, depending on the frame size. Refer to chapter 7.4 "Installing the auxiliary switches"
for more information.
Frame size Switching operation
of fuse switch
disconnector
Remarks Application Switching instant
of auxiliary switch
000 00 1 2 3
Open The auxiliary switch
is actuated ≥ 20 ms
before
the main
contacts
A downstream contactor is
disconnected before the main
contacts of the fuse switch
disconnector are isolated
Leading X X X X X
Close The auxiliary switch
is actuated ≥ 20 ms
after
the main
contacts
A downstream contactor cannot
be connected until the main
contacts of the fuse switch
disconnector are closed
Open The auxiliary switch
is actuated either
after
the main
contacts or
simultaneously
with
the main contacts
This ensures that the outgoing
side of the fuse switch
disconnector is deenergized
Lagging /
simultaneously
— X X X X
Close The auxiliary switch
is actuated either
before
the main
contacts or
simultaneously
with
the main contacts
The auxiliary switch warns
against voltages that are present
on the outgoing side of the fuse
switch disconnector
Functions, operation
6.2 Locking device
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 31
6.2 Locking device
Locking the fuse switch disconnector
You can lock the 3NP1 fuse switch disconnector to protect it against unauthorized actuation.
Either an eye (optional accessory, see below) and a padlock (shackle diameter: 6 mm) or
two padlocks (shackle diameter: 2x 3 mm) are required for this purpose. The padlocks are
not supplied with the fuse switch disconnector.
NOTICE
You can open the handle unit of a fuse switch disconnector that has been locked with an
eye and one padlock by force in order to trip an emergency stop (rupture point on the eye).
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
32 System Manual, 11/2008, 7112905-02DS01
6.3 Electronic fuse monitoring
Electronic fuse monitoring EFM - overview
The electronic fuse monitoring devices EFM 10 and EFM 20/25 (for sizes 000 to 3) are
mounted on the handle unit and wired in the factory. The EFM 10 and the EFM 20 for
monitoring AC systems (up to Uin = 690 V) work regardless of whether or not a load is
present. They detect, signal, and indicate the states of the fuses. The EFM 25 is designed
for monitoring DC systems (up to Uin = 440 V).
Figure 6-1 Handle unit with electronic fuse monitoring (EFM 10)
Figure 6-2 Handle unit with electronic fuse monitoring (EFM 20-25)
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 33
Typical applications of the EFM
● If a fuse fails, a "general fault" is signaled to a control room by means of integrated
auxiliary switches (1 signaling relay with 1 changeover contact).
● If a fuse fails, a load is disconnected, e.g. a contactor.
Possible areas of application for the EFM
The 3NP1 fuse switch disconnector is allowed to be used as follows to ensure safe isolation
in conjunction with the EFM:
● EFM 10 and EFM 20: 3-phase, sine wave AC systems (50/60 Hz) up to 690 V
● EFM 25: DC systems up to 440 V
Principle of the EFM 10
The electronic fuse monitoring device EFM 10 is supplied via the phases of the AC system. It
works according to the closed-circuit principle: The signaling relay is normally energized (no
fault). The electronic fuse monitoring device measures the voltages upstream and
downstream of the three fuses. If the voltage drop at one of the three fuses exceeds
20 V ± 10%, the following operating states occur:
● The electronic fuse monitoring device trips
● The signaling relay (changeover contact) drops out as the general alarm output
● The red LED on the fuse concerned lights up.
The red LED and the signaling relay always indicate the current states of the fuses. The
states are not stored.
The green LED indicates that power is being supplied to the electronic fuse monitoring
device.
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
34 System Manual, 11/2008, 7112905-02DS01
Circuit diagram of the EFM 10
4
/
/
/
0LFUR
FRQWUROOHU
$&7,9(
)$8/7/
)$8/7/
)$8/7/
Pin assignment of the EFM 10
WARNING
The green LED does not light up if the electronic fuse monitoring device is connected in a
way other than that described above when the infeed is live and more than one fuse is
faulty! In this case, the EFM's internal power supply can no longer be guaranteed (refer to
"Voltage tap for the internal power supply and direction of the incoming supply" below)!
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 35
Principle of the EFM 20
The electronic fuse monitoring device EFM 20 is supplied via the three phases L1, L2, and
L3 of the AC system. It works according to the closed-circuit principle (default setting): The
signaling relay is normally energized (no fault). The electronic fuse monitoring device
measures the voltages upstream and downstream of the three fuses. If the voltage drop at
one of the three fuses exceeds 13 V ± 10%, the following operating states occur:
● The electronic fuse monitoring device trips
● The signaling relay drops out
● The corresponding signal is indicated on the display
If line monitoring is active, the following signals may also be output:
● "Undervoltage" line function active
● "Overvoltage" line function active
● "Phase failure" line function active
The illuminated display indicates that power is being supplied to the electronic fuse
monitoring device.
Circuit diagram of the EFM 20
4 'LVSOD\
0LFUR
FRQWUROOHU
/
/
/
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
36 System Manual, 11/2008, 7112905-02DS01
Pin assignment of the EFM 20
WARNING
The display is not illuminated if the electronic fuse monitoring device is connected in a way
other than that described above when the infeed is live and more than one fuse is faulty! In
this case, the EFM's internal power supply can no longer be guaranteed (refer to "Voltage
tap for the internal power supply and direction of the incoming supply" below)!
Principle of the EFM 25
The electronic fuse monitoring device EFM 25 is supplied via the two poles L+ and L- of the
DC system. It works according to the closed-circuit principle (default setting): The signaling
relay is normally energized (no fault). The electronic fuse monitoring device measures the
voltages upstream and downstream of the three fuses. If the voltage drop at one of the fuses
exceeds 20 V ± 10%, the following operating states occur:
● The electronic fuse monitoring device trips
● The signaling relay drops out
● The corresponding signal is indicated on the display.
If line monitoring is active, the following signals may also be output:
● "Undervoltage" line function active
● "Overvoltage" line function active
The illuminated display indicates that power is being supplied to the electronic fuse
monitoring device.
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 37
Circuit diagram of the EFM 25 for voltages up to 240 V DC
/
/
4 'LVSOD\
0LFUR
FRQWUROOHU
Circuit diagram of the EFM 25 for voltages up to 440 V DC
Micro-
controller
Display
L-
L+
-Q1
14
11
12
14
11
12
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
38 System Manual, 11/2008, 7112905-02DS01
Pin assignment of the EFM 25
WARNING
The display is not illuminated if the electronic fuse monitoring device is connected in a way
other than that described above when the infeed is live and more than one fuse is faulty! In
this case, the EFM's internal power supply can no longer be guaranteed!
Short-circuit protection of the EFM 25:
Max. protection: "DIAZED 2 A gLgG" fuse
Operation of the EFM 20 and EFM 25
To activate SETUP or RUN mode, press the "Enter" key for longer than 2 seconds. The
memory function is activated by means of the setup functions.
2 pushbutton units for setting values
1 "Enter" pushbutton unit for selecting the
mode and "branching" within the menu
ENTER
WARNING
The fuse or the line is not monitored in SETUP mode. Monitoring is only assured in RUN
mode.
If line monitoring is active, the voltage limits are monitored. If one of the voltages exceeds or
falls below the limit, relay 2 drops out providing closed-circuit principle is selected (see
below). The symbol for undervoltage or overvoltage appears on the display.
If a fault occurs, the relays respond according to the selected operating principle after the set
error delay time (Del):
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 39
+\VW
Ux
-
y
Ux-y
Lx
Lx
5HOD\
5HOD\
'HO
8[\
5HOD\
5HOD\
'HO
8[\
5HOD\
5HOD\
+\VW
8
'HO
8[\
5HOD\
5HOD\
+\VW
8
'HO
8[\
5HOD\
5HOD\
'HO
/ / / / / /
//
5HOD\
5HOD\
!8
'HO
8[\
RSHQ
FORVHG
+\VW
5HOD\
5HOD\
'HO
/ / / / / /
//
5HOD\
5HOD\
!8
'HO
8[\
0HP QROLQHPRQLWRULQJDFWLYH
Working-current principle
12
1&
Closed-circuit principle
Symbol
Figure 6-3 Closed-circuit / working current principle, EFM 20 (AC)
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
40 System Manual, 11/2008, 7112905-02DS01
L+
5HOD\
5HOD\
'HO
8
5HOD\
5HOD\
'HO
8
+\VW
U=
U=
5HOD\
5HOD\
+\VW
8
'HO
8
5HOD\
5HOD\
+\VW
8
'HO
8
5HOD\
5HOD\
!8
'HO
8
RSHQ
FORVHG
+\VW
5HOD\
5HOD\
!8
'HO
8
0HP QROLQHPRQLWRULQJDFWLYH
Working-current principle 12
1&
Closed-circuit principle
Symbol
Figure 6-4 Closed-circuit / working current principle, EFM 25 (DC)
You acknowledge an alarm by simultaneously pressing the Up and Down keys (only if the
memory function is active).
NOTICE
All alarms should be acknowledged, even if they are no longer present!
If several alarms are present, only the alarm with the highest priority is actually displayed. An
alarm for a faulty fuse takes priority over all others (refer to the alarm priorities below).
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 41
Menu structure on the display of the EFM 20 (AC)
Legend:
● RUN: Operating mode
WARNING
The fuse or the line is not monitored in SETUP mode. Monitoring is only assured in
RUN mode.
● U1-2, U2-3, U3-1: phase-to-phase voltages
● Value: Value range (195 V to 790 V)
● TEST 1, TEST 2: Test on relay 1, test on relay 2
● SET?: Setup mode
● Hyst: Hysteresis (fluctuation range) in V (1 V - 20 V, default setting: 5 V)
● Del: Delay time after which a fault is indicated (0.1 to 20 s), e.g. in a system with large
voltage fluctuations or if the motor that is used draws a very high current on starting
● Mem?: Save yes / no
● NC: Normally closed - closed-circuit principle, i.e. the relay is energized (default setting)
● NO: Normally open - working current principle
● 1 2? : Contactor 1 responds like contactor 2
● Func 2? : Contactor 2 responds to overvoltage / undervoltage / phase failure
● Error: Fault indication
● RES?: Reset fault indication
● Memory?: Save fault indication yes / no
● L1 : Voltage at the fuses: Lower threshold exceeded:
● U1-2 : Phase-to-phase voltage: Lower threshold exceeded:
● U1-2 : Phase-to-phase voltage: Upper threshold value exceeded
● L1 : Phase failure L1
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
42 System Manual, 11/2008, 7112905-02DS01
1)
On
Del
Off
12 44
11
14
41
42
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 43
2)
Upper limit exceeded:
No limit violation:
Lower limit exceeded:
3) Functions or indication are only active if line monitoring is activated
4) If the memory function is active, the fault indication alternates with the following symbol:
2)1)
Menu structure on the display of the EFM 25 (DC)
Legend:
● RUN: Operating mode
WARNING
The fuse or the line is not monitored in SETUP mode. Monitoring is only assured in
RUN mode.
● U =: Line-to-line voltage
● Value: Value range (190 V to 510 V)
● TEST 1, TEST 2: Test on relay 1, test on relay 2
● SET?: Setup mode
● Hyst: Hysteresis (fluctuation range) in V (1 V - 20 V, default setting: 5 V)
● Del: Delay time after which a fault is indicated (0.1 to 20 s)
● Mem?: Save yes / no
● NC: Normally closed - closed-circuit principle, i.e. the relay is energized (default setting)
● NO: Normally open - working current principle
● 1 2? : Contactor 1 responds like contactor 2
● Func 2? : Contactor 2 responds to overvoltage / undervoltage / phase failure
● Error: Fault indication
● RES?: Reset fault indication
● Memory?: Save fault indication yes / no
● L+ , L- : Voltage at the fuse: Lower threshold exceeded:
● U = : Line-to-line voltage: Lower threshold exceeded:
● U = :Line-to-line voltage: Upper threshold value exceeded
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
44 System Manual, 11/2008, 7112905-02DS01
1)
On
Del
Off
12 44
11
14
41
42
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 45
2)
Upper limit exceeded:
No limit violation:
Lower limit exceeded:
3) Functions or indication are only active if line monitoring is activated
4) If the memory function is active, the fault indication alternates with the following symbol:
2)1)
Alarm priorities on the EFM 20-25
Priority Alarm Function type Remarks
1 Phase failure Line monitoring AC version only. The fault (phase or fuse failure) that was
detected first in the monitoring sequence from L1 to L2 to
L3 is indicated.
2 Fuse faulty Fuse monitoring DC version: A faulty fuse can only be detected if a load is
connected.
3 Overvoltage Line monitoring —
4 Overvoltage Line monitoring —
If several alarms are present, only the alarm with the highest priority is actually displayed.
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
46 System Manual, 11/2008, 7112905-02DS01
Voltage tap for the internal power supply and direction of the incoming supply on all EFMs, taking the
EFM 10 as an example
The EFM electronics are supplied via the phases (L1, L2, L3 or L+, L-) of the main circuit.
The voltage for the internal power supply is always tapped on the side of the handle unit.
Owing to the internal power supply, the electronics are only fully functional if at least two
phases on the input side are supplied with power. Please also note the direction of the
incoming supply as shown in the diagrams below:
1
2
1
2
1
2
AB
A 3NP11.3-1.A..
B 3NP11.3-1.B..
3NP11.3-1.C..
1 Infeed
2 Outgoing feeder
WARNING
The green LED on the EFM 10 does not light up, and the display of the EFM 20 or the EFM
25 is not illuminated, if the electronic fuse monitoring device is connected in a way other
than that described above when the infeed is live and more than one fuse is faulty! In this
case, the EFM's internal power supply can no longer be guaranteed!
WARNING
If the green LED does not light up or the display is not illuminated when the infeed is live
and the EFM is correctly connected, the EFM must be immediately replaced!
Functions, operation
6.3 Electronic fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 47
The table below shows:
● The number of tripped fuses
● Whether or not the electronics are active
● The "Fault" signal
as a function of the voltage tap (infeed side, outgoing side).
Table 6- 1 Number of tripped fuses, electronics active or not active and fault signal as a function of the voltage tap
(infeed side, outgoing side) on the EFM 10/20
Number of tripped fuses Electronics active Fault signal
AC 1) DC 2) AC DC AC DC
0 0 Yes Yes No No
1 1 Yes Yes Yes Yes
2 2 Yes Yes Yes Yes
Voltage tap for
electronics = infeed side
of the main conducting
paths. Infeed correct: see
pictures above 3 — Yes — Yes —
0 0 Yes Yes No No
1 1 Yes No Yes Relay returns to the
deenergized state (closed-
circuit principle)
2 2 No No Relay returns to the deenergized state
(closed-circuit principle)
Voltage tap for
electronics = outgoing
side of the main
conducting paths
3 — No — Relay returns to the deenergized state
1) AC ≙ EFM 10/20
2) DC ≙ EFM 25
Functions, operation
6.4 Mechanical fuse monitoring
Fuse switch disconnector 3NP1
48 System Manual, 11/2008, 7112905-02DS01
6.4 Mechanical fuse monitoring
Mechanical fuse monitoring MFM - overview
Mechanical fuse monitoring (sizes 00 to 3) is implemented with a SIRIUS circuit breaker. The
circuit breaker is mounted on the handle unit of the 3NP1 fuse switch disconnector and wired
in the factory.
Possible areas of application for the MFM
The MFM is used in AC systems up to Uin 690 V and DC systems up to Uin 440 V.
DANGER
Fuse monitoring by means of SIRIUS circuit breakers is not permissible in branch circuits
with circuit breakers in which DC regeneration with a voltage > 220 V DC can occur in the
event of a fault.
Principle of the MFM
When the handle unit is closed, the three conducting paths of the SIRIUS circuit breaker are
connected in parallel with the fuse links to be monitored.
When the handle unit is open, all the main conducting paths of the circuit breaker are
deenergized. The internal resistance of the circuit breaker has a high rated value to prevent
any impairment to the protection of the monitored fuse links.
The circuit breaker trips if a fuse melts due to overloading.
The auxiliary switch of the circuit breaker is required for an alarm or to disconnect the main
circuit, e.g. by means of a contactor.
Functions, operation
6.4 Mechanical fuse monitoring
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 49
Circuit diagram of the MFM for AC applications
,!! ,!! ,!!
/
/
/
Circuit diagram of the MFM for 240 V DC applications
,!! ,!! ,!!
/
/
Functions, operation
6.4 Mechanical fuse monitoring
Fuse switch disconnector 3NP1
50 System Manual, 11/2008, 7112905-02DS01
Circuit diagram of the MFM for 440 V DC applications
,!! ,!! ,!!
/
/
Connection of external signal lines to the MFM
The external signal lines are connected to the 4-pole connector:
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 51
Mounting and installation 7
7.1 Mounting position of the 3NP1 fuse switch disconnector (all frame
sizes)
Mounting position of the fuse switch disconnector, taking size 00 as an example
r
r
r
Figure 7-1 Mounting position, size 00
Mounting and installation
7.2 Approved circuits
Fuse switch disconnector 3NP1
52 System Manual, 11/2008, 7112905-02DS01
7.2 Approved circuits
The following circuits are approved:
/
/
/
Figure 7-2 Circuit diagram for AC applications
/
/
Figure 7-3 Circuit diagram for 220 V / 240 V DC applications
/
/
Figure 7-4 Circuit diagram for 440 V DC applications (floor mounting only)
Mounting and installation
7.3 Mounting onto standard rails
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 53
7.3 Mounting onto standard rails
Mounting the 3NP1 fuse switch disconnector onto standard rails
You can upgrade sizes 000, 00, or 1 with accessories for mounting onto standard rails as
follows:
Frame size 000 00 1
Mounting onto 1 standard rail X — —
Mounting between 2 standard rails 125 mm apart — X X
Mounting between 2 standard rails 150 mm apart — X X
Mounting the fuse switch disconnector, size 000 onto standard rail
Figure 7-5 Mounting the fuse switch disconnector, size 000 onto a standard rail (1)
Mounting and installation
7.3 Mounting onto standard rails
Fuse switch disconnector 3NP1
54 System Manual, 11/2008, 7112905-02DS01
Figure 7-6 Mounting the fuse switch disconnector, size 000 onto a standard rail (2)
Dismantling the fuse switch disconnector, size 000, from a standard rail
Figure 7-7 Dismantling the fuse switch disconnector, size 000, from a standard rail
Mounting and installation
7.3 Mounting onto standard rails
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 55
Mounting the fuse switch disconnector, sizes 00 and 1 onto a standard rail
PP
PP
PP
PP
Figure 7-8 Mounting the fuse switch disconnector, sizes 00 and 1 onto a standard rail (1)
PPPP
Figure 7-9 Mounting the fuse switch disconnector, sizes 00 and 1 onto a standard rail (2)
Mounting and installation
7.3 Mounting onto standard rails
Fuse switch disconnector 3NP1
56 System Manual, 11/2008, 7112905-02DS01
Dismantling the fuse switch disconnector, sizes 00 and 1
PP
PP
Figure 7-10 Dismantling the fuse switch disconnector, sizes 00 and 1 from a standard rail
The TH35-15 rail type to DIN EN 60715 is recommended (and preferred) for mounting onto
standard rails.
CAUTION
Mounting onto TH35-7.5 type standard rails is not permissible!
CAUTION
The device must audibly snap onto the standard rail when mounted, to prevent it from
being inadvertently loosened or turned.
WARNING
The cantilever length of the standard rail between 2 fixing points must not exceed 250 mm
when the device is mounted owing to the bending moments that occur when the switch is
actuated!
Mounting and installation
7.4 Installation of the auxiliary switches
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 57
7.4 Installation of the auxiliary switches
Purpose of the auxiliary switches
Auxiliary switches can be mounted as follows in accordance with IEC 60947-3:
● Size 000: "Leading" only
● Sizes 00, 1, 2, and 3: "Leading" or "lagging / simultaneously".
Refer to chapter "Functions, operation: Auxiliary switches - purpose, number and settings of
the switching instant".
Installing the auxiliary switch, size 000
Figure 7-11 Installing the auxiliary switch, size 000 (1)
Mounting and installation
7.4 Installation of the auxiliary switches
Fuse switch disconnector 3NP1
58 System Manual, 11/2008, 7112905-02DS01
Figure 7-12 Installing the auxiliary switch, size 000 (2)
Mounting and installation
7.4 Installation of the auxiliary switches
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 59
Installing the auxiliary switch, size 00
$
%
Figure 7-13 Installing the auxiliary switch, size 00
A Leading
B Lagging / simultaneously
Mounting and installation
7.4 Installation of the auxiliary switches
Fuse switch disconnector 3NP1
60 System Manual, 11/2008, 7112905-02DS01
Installing the auxiliary switch, sizes 1, 2, 3
$
%
Figure 7-14 Installing the auxiliary switch, sizes 1, 2 and 3
A Leading
B Lagging / simultaneously
Mounting and installation
7.5 Installing and removing the LV HRC fuses
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 61
7.5 Installing and removing the LV HRC fuses
Removing the fuses without contact
Fuse links can reach very high temperatures on melting. Removing them manually
immediately after melting is almost impossible.
By operating the release shaft and tilting sideways, the fuse links drop out contactlessly.
Figure 7-15 Installing and dismantling the fuses, sizes 000 and 00
Figure 7-16 Installing and dismantling the fuses, sizes 1, 2, 3
Mounting and installation
7.6 Mounting onto and dismantling from a busbar system
Fuse switch disconnector 3NP1
62 System Manual, 11/2008, 7112905-02DS01
7.6 Mounting onto and dismantling from a busbar system
Mounting onto a busbar system
General information
The following versions of the fuse switch disconnectors can be supplied for mounting onto a
busbar system:
● Sizes 000 and 00 for a 40 mm busbar system
● All sizes for a 60 mm busbar system
Bars with a thickness of 5 mm or 10 mm, e.g. manufactured by Siemens, Rittal, Wöhner, or
Jean Müller, can be used for both busbar systems. The devices can also be mounted onto
special 1-section busbars (Rittal) or double / triple T-section busbars (Wöhner).
Mounting onto and dismantling from a busbar system, sizes 000 and 00
In the delivery condition, the fuse switch disconnector is adjusted for busbars with a
thickness of 5 mm. To convert it to a 10 mm busbar, the terminal contacts must be shifted
with a screwdriver as shown below.
NOTICE
The fuse switch disconnector must audibly snap onto the busbar, to prevent it from being
inadvertently loosened or turned.
WARNING
Make sure the device is adjusted to the correct busbar thickness!
Mounting and installation
7.6 Mounting onto and dismantling from a busbar system
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 63
PP
PP
Figure 7-17 Mounting onto and dismantling from a busbar system, sizes 000 and 00
Mounting and installation
7.6 Mounting onto and dismantling from a busbar system
Fuse switch disconnector 3NP1
64 System Manual, 11/2008, 7112905-02DS01
Mounting onto and dismantling from a busbar system, sizes 1, 2, and 3
NOTICE
It may be necessary to shorten the reach-round protection (Siemens standard reach-round
protection with knockout openings) for installation in certain busbar system environments
(refer also to "Knockout openings").
[
1P
Figure 7-18 Mounting onto and dismantling from a busbar system, sizes 1, 2, and 3
WARNING
The device must be tightly screwed to the busbars. The specified tightening torque (6 Nm)
must be complied with!
Dismantling from a busbar system, sizes 1, 2, and 3
Follow the procedure described above for sizes 000 and 00.
Mounting and installation
7.7 Conversion options for the cable outlet
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 65
7.7 Conversion options for the cable outlet
Conversion options for the cable outlet
All busbar devices are supplied with the cable outlet on the bottom.
Mount the parts removed previously in reverse order without changing their orientation.
Figure 7-19 Converting the cable outlet, size 000
Mounting and installation
7.7 Conversion options for the cable outlet
Fuse switch disconnector 3NP1
66 System Manual, 11/2008, 7112905-02DS01
Figure 7-20 Converting the cable outlet, size 00
Mounting and installation
7.7 Conversion options for the cable outlet
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 67
Figure 7-21 Installing the cable outlet, sizes 1, 2, 3
Mounting and installation
7.8 Locking the 3NP1 fuse switch disconnector
Fuse switch disconnector 3NP1
68 System Manual, 11/2008, 7112905-02DS01
7.8 Locking the 3NP1 fuse switch disconnector
Locking the 3NP1 fuse switch disconnector
Refer to Chapter 6.2 "Locking device".
Mounting and installation
7.9 Knockout openings
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 69
7.9 Knockout openings
Knockout openings for voltage testing with a test probe
These six knockout openings are provided for testing whether or not the fuses are live using
the test probe of a measuring instrument.
CAUTION
The IP40 degree of protection in front of the window is reduced to IP30 if the knockouts are
removed.
Figure 7-22 Knockout openings for voltage testing with a test probe, taking size 00 as an example
Knockout openings for system installation
Knockout opening for the "shortest device"
Only provided on size 00 fuse switch disconnectors in conjunction with floor mounting and
box terminals (most compact version)
Figure 7-23 Knockout opening for the "shortest device" (size 00 only)
Mounting and installation
7.9 Knockout openings
Fuse switch disconnector 3NP1
70 System Manual, 11/2008, 7112905-02DS01
Knockout opening for "top mounting of busbar holders"
● For top-mounted busbar holders when the device is mounted onto a busbar system
● Only available for the Siemens system cover
Figure 7-24 Knockout opening for "top mounting", size 00
Figure 7-25 Knockout openings for "top mounting", sizes 1, 2, and 3
Mounting and installation
7.10 Sealing the fuse switch disconnector
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 71
7.10 Sealing the fuse switch disconnector
Protection against unauthorized opening by means of a seal
Seal the fuse switch disconnector as shown below. Sealing wires with a maximum diameter
of 2.5 mm2 can be used for this purpose.
Mounting and installation
7.10 Sealing the fuse switch disconnector
Fuse switch disconnector 3NP1
72 System Manual, 11/2008, 7112905-02DS01
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 73
Connection, wiring 8
8.1 Uncovering the cable connections
The cable connections for the various frame sizes are uncovered as follows:
Size 000
Figure 8-1 Removing the cable cover, size 000
Connection, wiring
8.1 Uncovering the cable connections
Fuse switch disconnector 3NP1
74 System Manual, 11/2008, 7112905-02DS01
Size 00
Figure 8-2 Removing the cable cover, size 00
Connection, wiring
8.1 Uncovering the cable connections
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 75
Sizes 1, 2, 3
%* %*
%* %*
Figure 8-3 Removing the cable cover, sizes 1, 2, 3
Connection, wiring
8.2 Connection types for the main and auxiliary conductors
Fuse switch disconnector 3NP1
76 System Manual, 11/2008, 7112905-02DS01
8.2 Connection types for the main and auxiliary conductors
The following connection types are available for the main and auxiliary conductors:
Blade terminal (all sizes except size 000)
Saddle terminal (accessory for blade terminal)
Prism terminal (accessory for blade terminal)
Connection, wiring
8.2 Connection types for the main and auxiliary conductors
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 77
Double prism terminal (accessory for blade terminal, not size 00)
Box terminal (all sizes)
Connection, wiring
8.3 Connection accessories
Fuse switch disconnector 3NP1
78 System Manual, 11/2008, 7112905-02DS01
8.3 Connection accessories
Terminals
Supply terminal, size 000, 16 to 95 mm2
Triple terminal for mounting to box terminals, size 00 (max. 16 mm2)
Triple terminal for mounting to blade terminal, size 00 (max. 16 mm2)
Other connection accessories
Cover cap for 1 empty location on a 3-phase busbar
Connection, wiring
8.3 Connection accessories
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 79
3-phase busbar, e.g. for connecting 4 fuse switch disconnectors
Link rail for 3-phase busbar
32 mm terminal module for 32 mm cover plane for size 00, blade terminal
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
80 System Manual, 11/2008, 7112905-02DS01
8.4 Main conductor connection
Main conductor connections for the various frame sizes
The connections of the main conductors for the various frame sizes are described below.
The following information is shown in table form:
● Tool to be used
● Tightening torque range
● Permissible conductor cross-sections
The following symbols are used in the tables:
● Necessary tools:
● Permissible tightening torque:
● Allen key:
● Hexagon socket head screw:
● Phillips "PH" cross-tip screwdriver:
● Pozidrive "PZ" cross-tip screwdriver:
● Slotted screwdriver:
● Solid without end sleeve:
● Solid with end sleeve:
● Finely stranded without end sleeve:
● Finely stranded with end sleeve:
● Layered conductors:
$
[% %
$
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 81
Main conductor connection, size 000
Version Necessary tools Permissible
tightening torque
Permissible conductor cross-section without end sleeve /
with end sleeve / layered conductors
$
[% %
$
3NP1123-1..2. 6 x 1 mm 10 to 12 Nm 1.5 to 50 mm2 1.5 to 35 mm2 8 mm x 8 mm
3NP1923-1BD00 6 mm 10 Nm 16 to 95 mm2 16 to 95 mm2 10 mm x 8 mm
WARNING
The cable should always be connected centrally on the 3NP11.3-1..20!
3NP1123-1..2. 3NP1923-1BD00
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
82 System Manual, 11/2008, 7112905-02DS01
Main conductor connection, size 00
Version Necessary tools Permissible
tightening torque
Permissible conductor cross-section without end sleeve /
with end sleeve / layered conductors
$
[% %
$
3NP1133-1..1. 13 mm 10 to 12 Nm 2.5 to 95 mm2 — —
3NP1133-1..2. 5 mm 10 Nm 6 to 70 mm2 6 to 50 mm2 9 mm x 8 mm
3NP1933-1BA00 PH2 2.6 Nm 1.5 to 70 mm2 1.5 to 70 mm2 10 mm x 13 mm
3NP1933-1BB10 PZ2 2.6 Nm 16 to 95 mm2 16 to 95 mm2 10 mm x 13 mm
13 mm 10 to 12 Nm
3NP1933-1BC00
5 mm 10 Nm
6 to 70 mm2 6 to 50 mm2 9 mm x 8 mm
WARNING
The cable should always be connected centrally on the 3NP11.3-1..20!
3NP1133-1..1. 3NP1133-1..2. 3NP1933-1BA00
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 83
3NP1933-1BB10 3NP1933-1BC00
Main and auxiliary conductor connections, sizes 1, 2, and 3
Version Necessary
tools
Permissible
tightening
torque
Permissible conductor cross-section
without end sleeve /
with end sleeve / layered conductors
Auxiliary conductor connection
$
[% %
$
3NP1143-
1..10 17 mm 10 to 12 Nm 16 to 150
mm2
— — 3NP1943-1BG10
3NP1153-
1..10... 17 mm 10 to 12 Nm 25 to 240
mm2
— — 3NP1943-1BG10
3NP1163-
1..10 17 mm 10 to 12 Nm 50 to 300
mm2
— — 3NP1943-1BG10
3NP1143-
1..20... 5 mm 10 Nm 70 to 185
mm2
— 10 mm x 20
mm
3NP1943-1BG40
3NP1153-
1..20 8 mm 25 Nm 120 to 300
mm2
— 10 mm x 32
mm
3NP1953-1BG40
3NP1163-
1..20 8 mm 25 Nm 120 to 300
mm2
— 20 mm x 32
mm
3NP1953-1BG40
WARNING
The cable should always be connected centrally on the 3NP11.3-1..20!
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
84 System Manual, 11/2008, 7112905-02DS01
3NP1143-1..1. 3NP1143-1..2.
3NP1153-1..1. 3NP1153-1..2.
3NP1163-1..1. 3NP1163-1..2.
Version Necessary
tools
Permissible
tightening
torque
Permissible conductor cross-section without
end sleeve / with end sleeve / layered
conductors
Auxiliary conductor connection
$
[% %
$
3NP1943-
1BA00 PH2 6 Nm 70 to 120
mm2
70 to 120
mm2
10 mm x 18
mm
3NP1943-1BG30
3NP1953-
1BA00 Versio
n A / Version
B
PH2 8 Nm / 8 Nm 120 to
240 mm2 /-
120 to
240 mm2 /-
—
/12 mm x 20
mm
3NP1953-1BG30
3NP1963-
1BA00 Versio
n A / Version
B
PH2 10 Nm / 8 Nm 150 to 300
mm2 /-
150 to 300
mm2 /-
—/16
mm x 24 mm
3NP1953-1BG30
3NP1943-
1BB10 5 mm 6 Nm 70 to 150
mm2
70 to 150
mm2
10 mm x 18
mm
3NP1943-1BG30
3NP1953-
1BB10 6 mm 8 Nm 120 to 240
mm2
120 to 240
mm2
10 mm x 20
mm
3NP1953-1BG30
3NP1963-
1BB10 6 mm 8 Nm 150 to 300
mm2
150 to 300
mm2
10 mm x 24
mm
3NP1953-1BG30
3NP1943-
1BB20 5 mm 6 Nm 2 x 35 ... 70
mm2
2 x 35 ... 70
mm2
— 3NP1943-1BG30
3NP1953-
1BB20 6 mm 8 Nm 2 x 70 ... 120
mm2
2 x 70 ... 120
mm2
— 3NP1953-1BG30
3NP1963-
1BB20 6 mm 8 Nm 2 x 150 ...
185 mm2
2 x 150 ...
185 mm2
— 3NP1953-1BG30
Connection, wiring
8.4 Main conductor connection
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 85
Version A Version B
0[
0[
3NP1143-1..10 +
3NP1943-1BA00
3NP1153-1..10 +
3NP1953-1BA00
3NP1153-1..10 +
3NP1953-1BA00
3NP1163-1..10 +
3NP1963-1BA00
3NP1163-1..10 +
3NP1963-1BA00
3NP11.3-1..10 + 3NP19.3-
1BB10
3NP11.3-1..10 + 3NP19.3-
1BB20
Connection, wiring
8.5 Auxiliary conductor connection
Fuse switch disconnector 3NP1
86 System Manual, 11/2008, 7112905-02DS01
8.5 Auxiliary conductor connection
Application
You can use the auxiliary conductor connection to tap control voltages.
Compatible, standard tab receptacles with a terminal width of 6.3 mm according to
DIN 46218/T3 are suitable for clamping conductor cross-sections from 0.5 mm2 to 6 mm2.
CAUTION
One auxiliary conductor can be connected to each conductor connection point.
Connection types for auxiliary conductor connections
Type of connection Size 000 Size 00 Size 1 Size 2 Size 3
Blade terminal — X X X X
Saddle terminal — — X X X
Prism terminal — X X X X
Box terminal X X X X X
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 87
Maintenance 9
No maintenance procedures are necessary.
Maintenance
Fuse switch disconnector 3NP1
88 System Manual, 11/2008, 7112905-02DS01
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 89
Technical data 10
Technical data of the fuse switch disconnectors
Standards IEC / EN 60439-1, IEC / EN 60947-3
Type 3NP1123... 3NP1133... 3NP1143... 3NP1153... 3NP1163...
Rated uninterrupted current Iu A 160 160 250 400 630
For fuse links according to DIN 43620 Size 000 00 and 000 1 and 0 2 and 1 3 and 2
Conventional free air thermal current
Ith
A 160 160 250 400 630
Rated operating voltage Ue
50 Hz / 60 Hz AC V 690 690 690 690 690
DC (3 conducting paths in series) V 440 440 440 440 440
DC (2 conducting paths in series) V 220/240 220/240 220/240 220/240 220/240
Rated insulation voltage Ui 1) V 1000 1000 1000 1000 1000
Rated impulse withstand voltage Uimp kV 8 8 8 8 8
Rated conditional short-circuit current
with fuses
Size /
A
000 / 160 00 / 160 1 / 250 2 / 400 3 / 630
Rated current at 500 / 690 V AC kA 80 80 80 80 50
Permissible let-through current of
fuses
kA 10 15 25 40 50
Short-circuit strength with fuses Size /
A
000 / 160 00 / 160 1 / 250 2 / 400 3 / 630
Rated current at 500 / 690 V kA
(rms)
120 120 120 100 100
Let-through I2t value kA2s 56 158 780 2150 5400
Permissible let-through current of
fuses
kA 15 23 32 40 60
Rated making capacity at 500 V AC kA 2 6 17 17 17
Rated making / breaking capacity
21B, 22B, 23B 400 V AC A 160 160 250 400 630
21B 500 V AC A 160 160 250 400 630
22B 500 V AC A 125 160 250 400 630
23B 500 V AC A 40 63 200 315 500
21 B 690 V AC A 160 160 250 400 630
22B 690 V AC A 50 125 250 400 500
23B 690 V AC A 25 35 100 125 200
21B 240 V DC A 160 160 250 400 630
22B 240 V DC A 100 160 250 400 630
23B 240 V DC A 80 100 200 250 400
21B 440 V DC A 100 160 250 400 630
22B 440 V DC A 50 125 200 315 500
23B 440 V DC A 25 63 100 160 250
1) Up to degree of pollution 2, above it Ui = 690 V
Technical data
Fuse switch disconnector 3NP1
90 System Manual, 11/2008, 7112905-02DS01
Type 3NP1123... 3NP1133... 3NP1143... 3NP1153... 3NP1163...
Capacitor switching capacity
At 400 V AC
Reactive power kvar 50 50 50 50 50
Rated current In A 72 72 72 72 72
At 525 V AC
Reactive power kvar 50 50 50 50 50
Rated current In A 55 55 55 55 55
Permissible ambient temperature 2) °C -25 to +55°C (operating), -50 to +80°C (storage)
Mechanical endurance Switching cycles 2000 2000 2000 2000 2000
Degree of protection (operator side)
Without molded plastic cover / cable lug cover IP30 (switch closed) / IP20 (switch open)
With molded plastic cover / cable lug cover IP40 (switch closed) / IP20 (switch open)
Power loss of the switch at Ith (plus fuses) W 9 12 23 34 48
Max. conductor cross-section of main
conductor connection
Blade terminal mm2 — Max. 95 Max. 150 Max. 240 Max. 300
Box terminal mm2 1,5 ... 50 6 ... 70 70 ... 185 120 ... 240 150 ... 300
Prism terminal mm2 — 16 ... 95 70 ... 150 120 ... 240 150 ... 300
Saddle terminal mm2 — 1,5 ... 70 70 ... 150 120 ... 240 150 ... 300
Layered conductors, box terminal mm x mm 8 x 8 9 x 8 10 x 20 10 x 32 10 x 32
Tightening torques for terminal screws
Blade terminal Nm — 10 ... 12 10 ... 12 10 ... 12 10 ... 12
Box terminal Nm 10 ... 12 10 10 25 25
Prism terminal / saddle terminal Nm — 2,6 6 8 10
Rated operational current of auxiliary switch
Auxiliary switch 3NP19.3-1FA00 A 0.25 (Ith = 5 A)
Auxiliary switch 3NP19.3-1FB00 A 0.1 (Ith = 0.1 A)
Permissible mounting positions Vertical and horizontal (no derating)
Weight, floor mounting
Standard kg 0,47 0,73 2,19 4,21 4,63
EFM kg 0,59 0,87 2,33 4,35 4,77
MFM kg 0,89 1,17 2,63 4,65 5,07
Weight, mounting onto busbar system
Standard kg 0,82 0,98 2,85 4,76 6,84
EFM kg 0,94 1,12 2,99 4,90 6,98
MFM kg 1,24 1,42 3,29 5,20 7,28
2) Only with disconnecting blade, otherwise observe the fuse manufacturers' information
Technical data
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 91
Technical data of the EFM 10
Rated operational voltage of the main switching devices Ue 230 V to 690 V AC, 50 / 60 Hz
Apparent power consumption S Approx. 2.5 VA
Internal resistance of the measuring circuit R in > 6 MΩ
Storage temperature -20°C to +80°C
Operating temperature -20°C to +65°C
Degree of protection when the main device is closed IP40
Signaling relay in accordance with IEC 60947-5-1
Loadability of the signaling relay
Rated operational voltage Ue 24 V
DC - 13; rated operational current Ie 1 A
AC - 15; rated operational current Ie 1.5 A
Conventional free air thermal current Ith 1.5 A
Rated impulse withstand voltage Uimp 4 kV
Rated insulation voltage Ui 250 V
Short-circuit protection Max. protection: "DIAZED 2 A gLgG"
fuse
Technical data of the EFM 20 and EFM 25 (common technical data)
Apparent power consumption S Approx. 2.5 VA
Internal resistance of the measuring circuit R in > 6 MΩ
Storage temperature -20°C to +80°C
Operating temperature -20°C to +65°C
Degree of protection when the main device is closed IP40
Signaling relay in accordance with IEC 60947-5-1
Signaling relay 1 1 changeover contact for fuse monitoring
only
Signaling relay 2 1 changeover contact as general alarm
output or like signaling relay 1 (default
setting)
Loadability of the signaling relay
Rated operational voltage Ue 24 V
DC - 13; rated operational current Ie 1 A
AC - 15; rated operational current Ie 1.5 A
Conventional free air thermal current Ith 1.5 A
Rated impulse withstand voltage Uimp 4 kV
Rated insulation voltage Ui 250 V
Short-circuit protection Max. protection: "DIAZED 2 A gLgG" fuse
Harmonic test On 3rd, 5th, and 7th harmonics
Technical data
Fuse switch disconnector 3NP1
92 System Manual, 11/2008, 7112905-02DS01
Technical data of the EFM 20 (AC version)
Rated operational voltage Ue 230 V to 690 V AC, 50 / 60 Hz
Undervoltage (default setting) 195 V (375 V)
Overvoltage (default setting) 790 V (425 V)
Voltage drop for faulty fuse > 13 V
Delay time (relay 1 for fuse monitoring, relay 2) 0.1 s
Memory function Off
Working current / closed-circuit principle Closed-circuit
Mode RUN mode
Menu command Show voltage values / alarms
Technical data of the EFM 25 (DC version)
Rated operational voltage Ue 220 V to 440 V DC
Undervoltage (default setting) 190 V (200 V)
Overvoltage (default setting) 510 V (240 V)
Voltage drop for faulty fuse > 20 V
Delay time (relay 1 for fuse monitoring, relay 2) 0.1 s
Memory function Off
Working current / closed-circuit principle Closed-circuit
Mode RUN mode
Menu command Show voltage values / alarms
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 93
Dimensional drawings and hole drilling templates 11
Handle positions
%
$&
'
(
)
*
+
,
.0
/
1
-
$% & '
Figure 11-1 Handle positions, size 000
1 ON position
2 Ready position
3 OFF / removal position
Dimensions (mm) A B C D E F G H I J K L M N
3NP1123-1CA20 76,6 — 60,6 71,6 88,8 141,7 — — 110,4 45 — — — —
3NP1123-1BB20 — 101,6 60,6 71,6 88,8 — 211,4 196 110,4 — 70 32 26 51
3NP1123-1BC20 — 101,6 60,6 71,6 88,8 — 207 196 110,4 — 70 32 26 51
3NP1123-1J.20 — 101,6 60,6 71,6 88,8 — 210,4 — — — — — — —
A, B Switch closed
C Parking position of handle unit
D Dismantling position of handle unit
Dimensional drawings and hole drilling templates
Fuse switch disconnector 3NP1
94 System Manual, 11/2008, 7112905-02DS01
$&
%'
(
+
,
.0
/
1
-
$% & '
)
*
Figure 11-2 Handle positions, size 00
1 ON position
2 Ready position
3 OFF / removal position
Dimensions (mm) A B C D E F G H I J K L M N
3NP1133-1CA10 86,5 — 63,7 87,7 105,
8
202 — — 184 45 — — — —
3NP1133-1CA20 86,5 — 63,7 87,7 105,
8
200 — — 184 45 — — — —
3NP1133-1BB.0 — 111,
5
63,7 87,7 105,
8
— 210,
2
196 184 — 70 32 26 51
3NP1133-1BC.0 — 111,
5
63,7 87,7 105,
8
— 206,
2
196 184 — 70 32 26 31
3NP1133-1J..0 — 111,
5
63,7 87,7 105,
8
— 215,
1
— — — — — — —
A, B Switch closed
C Parking position of handle unit
D Dismantling position of handle unit
Dimensional drawings and hole drilling templates
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 95
(
$
%
&
'
)
,
+
-
*
$% & '
Figure 11-3 Handle positions, sizes 1,2 and 3
1 ON position
2 Ready position
3 OFF / removal position
Dimensions (mm) A B C D E F G H I J
3NP1143-1CA.0 115 — 180 186 — 183,7 275,6 — — —
3NP1153-1CA.0 129,9 — 200 207 — 209,4 280 90 — —
3NP1163-1CA.0 138,5 — 200 207 — 249,4 280 90 — —
3NP1143-.BC.0 115 138 180 186 144,2 183,7 275,6 — 26 97,8
3NP1153-.BC.0 129,9 153 200 207 144,2 209,4 280 90 26 97,8
3NP1163-.BC.0 138,5 161,5 200 207 144,2 249,4 280 90 26 97,8
A, B Switch closed
C Parking position of handle unit
D Dismantling position of handle unit
Dimensional drawings and hole drilling templates
Fuse switch disconnector 3NP1
96 System Manual, 11/2008, 7112905-02DS01
Dimensional drawings: Mounting onto standard rail
Figure 11-4 Dimensional drawing: Mounting onto standard rail, 3NP1 size 000
=
& %
$
Figure 11-5 Dimensional drawing: Mounting onto standard rail, 3NP1 size 00
Dimensions (mm) Z A B C
3NP1133-1CA10 150 105,8 26 26
3NP1133-1CA10 125 105,8 38,5 38,5
3NP1133-1CA20 150 105,8 25 25
3NP1133-1CA20 125 105,8 37,5 37,5
3NP1143-1CA .. 150 183,7 93 63
3NP1143-1CA .. 125 183,7 105,5 75,5
Dimensional drawings and hole drilling templates
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 97
Hole drilling templates
CAUTION
The hole drilling templates are not exactly to scale (1:1).
Hole drilling templates for the fuse switch disconnectors
ෘ
Figure 11-6 Hole drilling template: Fuse switch disconnector size 000
Dimensional drawings and hole drilling templates
Fuse switch disconnector 3NP1
98 System Manual, 11/2008, 7112905-02DS01
ෘ
Figure 11-7 Hole drilling template: Fuse switch disconnector size 00
'
(
$
%
*
&
)
Figure 11-8 Hole drilling template: Fuse switch disconnector sizes 1, 2, 3
Dimensions (mm) A B C D E F
3NP1143-1CA.0 306 138 50 150 130 11
3NP1153-1CA.0 306 138 50 166 130 11
3NP1163-1CA.0 306 138 50 195 160 11
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 99
ESD guidelines A
Radio interference
NOTICE
This is a class A product. The device may cause RF interference in residential areas. Take
appropriate measures in this case!
ESD guidelines
Fuse switch disconnector 3NP1
100 System Manual, 11/2008, 7112905-02DS01
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 101
List of abbreviations B
The following abbreviations are used in the manual:
Table B- 1 List of abbreviations
LV HRC Low-Voltage High Breaking Capacity fuse
EFM Electronic Fuse Monitoring
MFM Mechanical Fuse Monitoring
List of abbreviations
Fuse switch disconnector 3NP1
102 System Manual, 11/2008, 7112905-02DS01
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 103
Index
3
32 mm terminal module for 32 mm cover plane for size
00, blade terminal, 79
3-phase busbar, 79
A
Abbreviations, 101
Accessories, 17
Alarm priorities on the EFM 20-25, 45
Application areas, 12
Applications, 12
Auxiliary conductor connection, applications, 86
Auxiliary switches, 29, 57
B
Blade terminal, 86
Blade terminal (all sizes except size 000), 76
Box terminal, 77, 86
Busbar system mounting in distribution boards, sizes
000 and 00 / sizes 1 2, 3, 28
C
CE marking, 9
Circuit diagram of the EFM 10, 34
Circuit diagram of the EFM 20, 35
Circuit diagram of the EFM 25 for voltages up to 240 V
DC, 37
Circuit diagram of the EFM 25 for voltages up to 440 V
DC, 37
Circuit diagram of the MFM for 240 V DC
applications, 49
Circuit diagram of the MFM for 440 V DC
applications, 50
Circuit diagram of the MFM for AC applications, 49
Closed-circuit / working current principle, EFM 20
(AC), 39
Closed-circuit / working current principle, EFM 25
(DC), 40
Conductor cross-sections, 80
Connection of external signal lines to the MFM, 50
Connection types, 17
Connection types for auxiliary conductor
connections, 86
Conversion options, 17
Conversion options for the cable outlet, 65
Cover cap for 1 empty location on a 3-phase
busbar, 78
Cover support, 20
D
Degrees of protection, 9
Dimensional drawing: Mounting onto standard rail,
3NP1 size 00, 96
Dimensional drawing: Mounting onto standard rail,
3NP1 size 000, 96
Directives, 10
Dismantling from a busbar system, sizes 1, 2, and
3, 64
Dismantling the fuse switch disconnector, sizes
00 and 1, 56
Double prism terminal (accessory for blade terminal,
not size 00), 77
E
EFM 20 and EFM 25 (common technical data), 91
Electronic fuse monitoring EFM - overview, 32
Environmental compatibility, 10
F
Floor mounting, 14, 15, 16
Floor mounting in distribution boards, sizes 000 and
00 / sizes 1, 2, 3, 28
Frame sizes, 13
H
Handle positions, 93
Handle positions, size 00, 94
Handle positions, size 000, 93
Handle positions, sizes 1, 2, and 3, 95
Handle unit with electronic fuse monitoring (EFM
10), 21
Handle unit with electronic fuse monitoring (EFM
20/25), 22
Index
Fuse switch disconnector 3NP1
104 System Manual, 11/2008, 7112905-02DS01
Handle unit with mechanical fuse monitoring (MFM), 22
Hole drilling template: Fuse switch disconnector
size 00, 98
Hole drilling template: Fuse switch disconnector
size 000, 97
Hole drilling template: Fuse switch disconnector sizes
1, 2, and 3, 98
Hole drilling templates, 97
I
Installation points, 13
Installing the auxiliary switch, size 00, 59
Installing the auxiliary switch, size 000, 57
Installing the auxiliary switch, sizes 1, 2, 3, 60
K
Knockout opening for "top mounting of busbar
holders", 70
Knockout opening for the "shortest device", 69
Knockout openings for system installation, 69
Knockout openings for voltage testing with a test
probe, 69
L
Link rail for 3-phase busbar, 79
Locking device, 23
Locking the fuse switch disconnector, 31
M
Main and auxiliary conductor connections, sizes 1, 2,
and 3, 83
Main conductor connection, size 00, 82
Main conductor connection, size 000, 81
Mechanical fuse monitoring MFM - overview, 48
Menu structure on the display of the EFM 20 (AC), 41
Menu structure on the display of the EFM 25 (DC), 43
Molded plastic cover, taking size 00 as an example, 20
Mounting kit for mounting a 3NP1 fuse switch
disconnector between two standard rails, taking size 00
as an example, 23
Mounting onto a 40 mm busbar system, 25
Mounting onto a 60 mm busbar system, 26
Mounting onto a 60 mm busbar system with a bottom
trough, 27
Mounting onto and dismantling from a busbar system,
sizes 000 and 00, 62
Mounting onto and dismantling from a busbar system,
sizes 1, 2, and 3, 64
Mounting onto Rittal busbar system, 14, 15, 16
Mounting onto Siemens busbar system, 14, 15, 16
Mounting onto standard rails, 53
Mounting position of the fuse switch disconnector,
taking size 00 as an example, 51
Mounting the 3NP1 fuse switch disconnector onto
standard rails, 53
N
Number of tripped fuses, electronics active or not
active and fault signal as a function of the voltage tap
(infeed side, outgoing side) on the EFM 10/20, 47
O
Operation of the EFM 20 and EFM 25, 38
Order number structure for accessories, 24
Order number structure for the main devices, 24
Other connection accessories, 78
P
Performance features, 11
Pin assignment of the EFM 10, 34
Pin assignment of the EFM 20, 36
Pin assignment of the EFM 25, 38
Prism terminal, 76, 86
Protection against unauthorized opening by means of a
seal, 71
Radio interference, 99
R
Rated operational voltage, 13
Reach-round protection for mounting onto Rittal 40/60
mm busbar system, taking size 00 as an example, 19
Reach-round protection for mounting onto Siemens 40
mm busbar system, taking size 00 as an example, 19
Reach-round protection for mounting onto Siemens 60
mm busbar system, taking size 00 as an example, 19
Removing the fuses, 61
Requirements, 9
Index
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 105
S
Saddle terminal, 76, 86
Short-circuit protection of the EFM 25:, 38
Standard handle unit, 21
Standards, 9
Supply terminal, size 000, 16 to 95 mm2, 78
Symbols, 7, 80
T
Technical data of the EFM 10, 91
Technical data of the EFM 20 (AC version), 92
Technical data of the EFM 25 (DC version), 92
Technical data of the fuse switch disconnectors, 89
Terminal cover with reach-round protection on the back
and bottom cover for floor mounting, size 00, 20
Terminal cover with reach-round protection on the back
for Siemens busbar system, 20
Tightening torques, 80
Triple terminal for mounting to blade terminal, size 00
(max. 16 mm2), 78
Triple terminal for mounting to box terminals, size 00
(max. 16 mm2), 78
U
Utilization category, 13
V
Versions, sizes, and types of mounting, 12
Voltage tap for the internal power supply and direction
of the incoming supply on all EFMs, taking the EFM 10
as an example, 46
Fuse switch disconnector 3NP1
System Manual, 11/2008, 7112905-02DS01 106
www.siemens.com/automation
Subject to change without prior notice
Order No.: 3ZX1012-0NP10-1AC1
© Siemens AG 2008
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