Manual
3RN2 Thermistor motor protection relay
Monitoring and control devices
Edition 10/2016
siemens.com
SIRIUS
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________
SIRIUS
Monitoring and control devices
SIRIUS 3RN2 thermistor motor
protection relay
Manual
10/2016
A5E34244868002A/RS
-AA/001
Introduction
1
Safety notes
2
ATEX
3
Description
4
Mounting
5
Connection
6
Functions
7
Alarm, error and system
messages
8
Technical data
9
CAx data
10
Dimension drawings
11
Circuit diagrams
12
Spare parts/accessories
13
3ZX1012-0RN20-1AC1
Ⓟ
10/2016 Subject to change
Copyright © Siemens AG 2016.
All rights reserved
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
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
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 product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
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 complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of 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.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 5
Table of contents
1 Introduction ............................................................................................................................................. 7
1.1 Required basic knowledge ........................................................................................................ 7
1.2 Service&Support ....................................................................................................................... 7
1.3 DataMatrix code ...................................................................................................................... 10
1.4 Standards/Regulations/Approvals .......................................................................................... 11
1.5 Declaration of conformity ........................................................................................................ 11
1.6 Article No. scheme .................................................................................................................. 12
2 Safety notes .......................................................................................................................................... 13
2.1 General safety notes ............................................................................................................... 13
2.2 Intended use ........................................................................................................................... 14
2.3 Current information about operational safety ......................................................................... 14
3 ATEX .................................................................................................................................................... 15
3.1 Safety and commissioning instructions for hazardous areas ................................................. 15
3.2 Use in areas subject to an explosion hazard due to gases or dust ........................................ 19
4 Description ............................................................................................................................................ 21
4.1 Device overview ...................................................................................................................... 21
4.2 Device description ................................................................................................................... 21
4.3 Device versions ....................................................................................................................... 25
4.4 Special features ...................................................................................................................... 25
4.5 Area of application .................................................................................................................. 26
5 Mounting ............................................................................................................................................... 27
5.1 Warning notices ...................................................................................................................... 27
5.2 Terminal coding ...................................................................................................................... 28
5.3 Mounting the devices on a standard mounting rail ................................................................. 29
5.4 Disassembling devices from a standard mounting rail ........................................................... 30
5.5 Mounting the devices on a wall ............................................................................................... 31
5.6 Removing the devices from the wall ....................................................................................... 32
Table of contents
SIRIUS 3RN2 thermistor motor protection relay
6 Manual, 10/2016, A5E34244868002A/RS-AA/001
6 Connection ........................................................................................................................................... 33
6.1 Terminal assignment .............................................................................................................. 33
6.2 Connection data for terminals ................................................................................................ 38
6.3 Connecting the screw-type terminals ..................................................................................... 39
6.4 Disconnecting the screw-type terminals ................................................................................ 40
6.5 Wiring rules for spring-loaded terminals (with push-in technology) ....................................... 41
6.6 Connect the spring-loaded terminal (push-in) ........................................................................ 42
6.7 Disconnect the spring-loaded terminal (push-in) ................................................................... 44
6.8 Attaching the terminals .......................................................................................................... 45
6.9 Removing the terminals ......................................................................................................... 46
7 Functions .............................................................................................................................................. 47
8 Alarm, error and system messages ....................................................................................................... 51
8.1 Function charts....................................................................................................................... 51
8.2 LED displays .......................................................................................................................... 54
9 Technical data ...................................................................................................................................... 57
9.1 Technical data in Siemens Industry Online Support .............................................................. 57
10 CAx data ............................................................................................................................................... 59
11 Dimension drawings .............................................................................................................................. 61
12 Circuit diagrams .................................................................................................................................... 65
13 Spare parts/accessories ........................................................................................................................ 67
Index .................................................................................................................................................... 69
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 7
Introduction
1
1.1
Required basic knowledge
Basic knowledge of low-voltage industrial controls is required to understand this manual.
WARNING
Qualified personnel required
All work involved in connecting, commissioning, and maintenance must be performed by
qualified, responsible
personnel.
Improper handling may result in serious
personal injury and considerable damage to
property
.
1.2
Service&Support
Online Support
The Online Support in the Service&Support portal is an extensive information system for all
questions relating to Siemens products and solutions. This service enables direct and central
access to in-depth information concerning the products, systems and applications for
industry and to a large number of programming, configuration, and application examples. Its
content is available via a mobile app.
The Technical Forum of the Online Support provides the opportunity for users to swap
information. Support Request allows contact to be established with Siemens experts in
Technical Support.
Siemens Industry Online Support ensures that users in industry are always kept up-to-date
with news, software updates and announcements by means of newsletters and Twitter.
Links:
Service&Support Portal (http://support.automation.siemens.com), Online Support
(http://support.automation.siemens.com/WW/view/en/16605022)
Introduction
1.2 Service&Support
SIRIUS 3RN2 thermistor motor protection relay
8 Manual, 10/2016, A5E34244868002A/RS-AA/001
Product Support
Are you looking for product information such as technical data, updates or FAQs? The
"Product Support" section of the Service&Support portal offers an extensive collection of all
information about the Siemens Industry Automation and Drive Technologies products and
solutions:
● Answers to frequently asked questions (FAQs)
● Updates/upgrades, service packs, and support tools for downloading
● Manuals and operating instructions
● Technical specifications/CAx data
● Approvals and certificates
● Test certificates and characteristic curves
All Product Support information is at your disposal free of charge and around the clock, and
you always get the current version.
Link:
Product Support (http://support.automation.siemens.com/WW/view/en/4000024)
CAx data
The CAx Download Manager provides you with a simple means of gaining access to up-to-
date product data for your CAx or CAe system.
You configure your own download package with just a few clicks. You can choose from the
following information for products:
● Product images
● 2D dimensional drawings
● 3D models
● Internal circuit diagrams
● EPLAN macro files
● Manuals
● Characteristics
● Operating instructions
● Certificates
● Product master data
Link:
CAx Download Manager
(http://support.automation.siemens.com/WW/view/en/42455541)
Introduction
1.2 Service&Support
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 9
Applications & Tools
Applications & Tools supports you with various tools and examples when it comes to solving
your automation tasks. Solutions are presented as the interaction between several
components in the system, without focusing on individual products:
● Application examples
● Function blocks & tools
● Background and system descriptions
● Performance statements
● Demonstration systems/videos
Link:
Applications & Tools (https://support.industry.siemens.com/cs/ww/en/sc/2054)
My Documentation Manager
The My Documentation Manager enables you to put together your own documentation from
our standard documents (manuals), which are located in the product support Under
mySupport, you have the opportunity to create and manage you own compilations in a
structure of their own.
Link:
My Documentation Manager
(http://support.automation.siemens.com/WW/view/en/38715968)
Introduction
1.3 DataMatrix code
SIRIUS 3RN2 thermistor motor protection relay
10 Manual, 10/2016, A5E34244868002A/RS-AA/001
1.3
DataMatrix code
A DataMatrix code is lasered onto the lower terminal cover of all devices of this series.
DataMatrix codes are standardized in ISO/IEC 16022. The DataMatrix codes on Siemens
devices use ECC200 coding.
The following device information is encoded in the DataMatrix codes as a bit stream:
● Article number
● Serial number
This information is stored in the following format in the DataMatrix code:
1P
Article number
+
S
Serial number
Data identifier Net content Separator Data identifier Net content
Note
The information content is displayed without spaces.
This machine-readable information simplifies and accelerates handling of the respective
devices.
As well as fast access to the serial numbers of the respective devices for unique
identification, the DataMatrix codes simplify communication with Siemens Technical Support.
SIEMENS Industry Support App
DataMatrix codes primarily enable extremely fast and convenient access to all device-
specific information relating to an article number in the SIEMENS Service&Support Portal
(http://support.automation.siemens.com), such as operating instructions, manuals, data
sheets, FAQs, etc.
We provide the SIEMENS Industry Support app free of charge for this purpose and it can be
used on most commercially available smart phones and tablets.
The SIEMENS Industry Support app is available for iOS and Android-based devices and can
be accessed via the following links:
Link for Android
Link for iOS
Link for Windows Phone
Introduction
1.4 Standards/Regulations/Approvals
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 11
1.4
Standards/Regulations/Approvals
Standards
The SIRIUS 3RN2 thermistor motor protection relays comply with the following standards:
● EN 60947-8 "Low-voltage switchgear and controlgear - Control units for built-in thermal
protection (PTC) for rotating electrical machines"
● EN 50495 "Safety devices required for the safe functioning of equipment with respect to
explosion risks"
UL/CSA/Shipbuilding approval
SIRIUS components have been approved by a whole range of bodies for various sectors
(e.g. shipbuilding).
You will find the the current list of approvals in the Monitoring and Control Devices chapter of
Catalog IC 10 - "SIRIUS Industrial Controls” (www.siemens.com/industrial-controls/catalogs).
Further information and certificates are available for download on the Internet
(https://support.industry.siemens.com/cs/ww/en/ps).
1.5
Declaration of conformity
The manufacturer declares that the thermistor motor protection relays of the SIRIUS 3RN2
series in the designs marketed by us comply with the applicable basic safety and health
requirements of the EC Directives* stated (including amendments) and that the stated
standards* were applied in their design and construction.
* You can download the complete EC Declaration of Conformity from the Service Portal
(https://support.industry.siemens.com/cs/ww/en/ps/16027/cert) in PDF format.
Introduction
1.6 Article No. scheme
SIRIUS 3RN2 thermistor motor protection relay
12 Manual, 10/2016, A5E34244868002A/RS-AA/001
1.6
Article No. scheme
Note
The Article No. scheme is for illustrative purposes only and for better understanding of the
logic behind the
article numbers.
For your orders, please use the article numbers quoted in the catalog in the Selection and
ordering data.
Table 1- 1 Article No. scheme
Digit of the Article No.
1 - 3
4
5
6
7
8
9
10
11
12
SIRIUS thermistor
motor protection relay
3 R N
☐
☐
☐
☐
-
☐
☐
☐
☐
0
Generation
☐
-
2
Generation
Sensor type
☐
-
0
Type A PTC
Number/type of sensor
circuits
☐ - 0 1 sensor circuit, supply voltage = relay
output voltage
1
1 sensor circuit
2
2 sensor circuits for warning and tripping
Resetting and further
functions
☐ -
0
Automatic reset
1 Manual reset, with wire-break and short-
circuit detection
2 Manual/auto/remote reset, non-volatile,
with wire-break and short-circuit
detection
3 Manual/auto/remote reset, non-volatile,
with wire-break and short-circuit
detection, with protective separation
Connection system - ☐
1
Screw terminal
2
Spring-loaded terminal (push-in)
Output relay - ☐
A
1 CO contact
B
2 CO contacts
C
1 NO contact + 1 NC contact
D
1 NO contact + 1 CO contact
G
2 CO contacts, hard gold-plated
Supply voltage - ☐
A
24 V
W
24 … 240 V
Waveform of the
supply voltage
- ☐
3
50/60 Hz AC/DC
4
DC
Relay response to
power failure
☐
0
Monostable
1
Bistable
8
Special versions
Example
3 R N
2
0
0
0
-
1
A
A
3
0
SIRIUS thermistor motor protection
relay, 2nd generation, type A PTC, 1
sensor circuit, automatic reset, screw-
type terminals, 1 CO, 24 V, 50/60 Hz
AC/DC, monostable
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 13
Safety notes
2
2.1
General safety notes
Note
Recycling and disposal
Dispose of existing packing material in accordance with applicable regulations or recycle it.
The SIRIUS 3RN2 thermistor motor protection relays can be recycled thanks to a low
-
pollutant manufacturing process
. For environmentally-friendly recycling and disposal of your
electronic waste, please contact a company certified for the disposal of electronic waste.
WARNING
Protection against electrically conductive contamination
The devices must be protected against conductive contamination while taking account of
the ambient conditions. One way to achieve this is to install the devices in a control cabinet
with the appropriate degree of protection.
You will find more detailed information in IEC 60529, for example.
CAUTION
Protection against electrostatic charge
When handling and installing the SIRIUS 3RN2 thermistor motor protection relays, ensure
that the components are protected from being electrostatically charged. Changes to the
system configuration and wiring are only permissible while the supply voltage is switched
off.
Connection of SIRIUS 3RN2 thermistor motor protection relays is only permissible when
the power supply is switched off.
Safety notes
2.2 Intended use
SIRIUS 3RN2 thermistor motor protection relay
14 Manual, 10/2016, A5E34244868002A/RS-AA/001
2.2
Intended use
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Intended Use of Hardware Products
This equipment is only allowed to be used for the applications described in the catalog and
in the technical description, and only in conjunction with non-Siemens equipment and
components recommended by Siemens.
Correct transport, storage, installation and assembly, as well as careful operation and
maintenance, are required to ensure that the product operates safely and without faults.
2.3
Current information about operational safety
Important note for maintaining operational safety of your system
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury or Risk of Property Damage
Please take note of our latest information
Systems with safety-related characteristics are subject to special operational safety
requirements on the part of the operator. The supplier is also obliged to comply with special
product monitoring measures. For this reason, we publish a special newsletter containing
information on product developments and features that are (or could be) relevant to
operation of safety-related systems. By subscribing to the appropriate newsletter, you will
ensure that you are always up-to-date and able to make changes to your system, when
necessary:
SIEMENS Newsletter (http://www.industry.siemens.com/newsletter) Subscribe to the
following newsletter under "Products & Solutions":
• Control Components and System Engineering News
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 15
ATEX
3
3.1
Safety and commissioning instructions for hazardous areas
Information and standards
Increased danger in hazardous areas means it is necessary to observe the following notes
and standards carefully:
● EN 60079-14/VDE 0165-1 for electrical apparatus for explosive gas atmospheres
● EN 60079-17 Inspection and maintenance of electrical installations in hazardous areas.
● EN 50495 Safety devices required for the safe functioning of equipment with respect to
explosion risks
The following SIRIUS 3RN2 thermistor motor protection relays with short-circuit detection are
approved for Equipment Group II, Category (2) in Area "G" (areas in which potentially
explosive gas, vapor, mist, or air mixtures are present) and are additionally approved for
Area "D" (areas containing combustible dust):
● 3RN2011
● 3RN2012-.B.30
● 3RN2013
● 3RN2023
SIRIUS 3RN2 thermistor motor protection relays are not intended for installation in
hazardous areas. If they are installed in a potentially explosive atmosphere, the SIRIUS
3RN2 thermistor motor protection relays must be adapted to the applicable type of
protection.
The machine or plant must shut down immediately if the SIRIUS 3RN2 thermistor motor
protection relay is tripped, even if connected through a frequency converter. This must be
implemented with circuitry.
SIRIUS 3RN2 thermistor motor protection relays with functional safety in accordance with
EN 50495 are suitable for protecting explosion-proof motors/machines.
On devices with a supply voltage of 24 V AC/DC, you must ensure galvanic separation with
a battery network or a power supply unit with galvanic separation (e.g. isolating transformer)
(does not apply to 3RN2013-.BA30).
ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
16 Manual, 10/2016, A5E34244868002A/RS-AA/001
A SIRIUS 3RN2 thermistor motor protection relay set to "automatic RESET" mode will be
reset automatically after the recovery time has elapsed, without the RESET button being
pressed. An additional ON button has to be used to ensure that the motor does not start up
automatically following tripping. You must not use "Automatic RESET" mode in applications
where there is a risk of personal injury or damage to property if the motor restarts
unexpectedly.
A risk analysis must be performed for the complete plant or machine. If this analysis yields a
lower hazard potential (category 1), all SIRIUS 3RN2 thermistor motor protection relays can
be used, provided the safety regulations are observed.
WARNING
Personal injury and damage to property
All connection, commissioning and maintenance work must be performed by qualified,
responsible personnel. Improper handling may result in serious personal injury and
considerable damage to property.
Cable routing
The measuring circuit cables must be routed as separate control cables. Use of cores from
the power supply cable of the motor or any other main supply cables is not permitted. If
extreme inductive or capacitive interference is expected as a result of power lines routed in
parallel, shielded control cables must be used.
Maximum length of sensor circuit cables for devices without short-circuit detection in the
sensor circuit:
Conductor cross section
3RN2000, 3RN2010
2.5 mm
2
2 x 2800 m
1.5 mm
2
2 x 1500 m
0.5 mm
2
2 x 500 m
Maximum length of sensor circuit cables for devices with short-circuit detection 1):
Conductor cross section
3RN2011, 3RN2012, 3RN2013, 3RN2023
2.5 mm
2
2 x 250 m
1.5 mm
2
2 x 150 m
0.5 mm2 2 x 50 m
1) Short-circuits in the sensor circuit are detected up to this maximum cable length.
ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 17
Safety data
Safety data calculated according to DIN EN ISO 13849 and IEC 61508 for an ambient temperature of
40 °C and self-heating of 15 °C
SIL
1
Performance level (according to DIN EN ISO
13849)
C
Category (according to DIN EN ISO 13849)
Cat. 1
Architecture 1oo1
HFT
0
Safety device type
Type B
λ
S
8.26E-07
λDD
6.80E-08
λ
DU
3.08E-07
SFF
≥ 60 %
PFD
≤ 1.5E-02
PFHd
≤ 1.5E-06
MTBF
≥ 50 years
MTTFd (according to EN ISO 13849)
High
DC
avg
(according to DIN EN ISO 13849)
None
T1 value (repeat test)
≤ 3 years (DIN EN 60079-17, Section 4.4)
Note
Currently valid safety values
You can find the currently valid safety values in the Siemens Industry Online Support
(
https://support.industry.siemens.com/cs/ww/en/ps/).
Installation and commissioning
SIRIUS 3RN2 thermistor motor protection relays are suitable for snap-on mounting onto a 35
mm standard rail in accordance with EN 60715 or for screw mounting with an adapter
(accessory).
Any mounting position is possible.
NOTICE
Test the protection function
Test the protection function before commissioning.
ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
18 Manual, 10/2016, A5E34244868002A/RS-AA/001
Notes on configuration
Install the measuring circuit cables as separate control cables. Use of cores from the power
supply cable of the motor or any other main supply cables is not permitted. If extreme
inductive or capacitive interference is expected as a result of power lines routed in parallel,
use shielded control cables.
NOTICE
Use in hazardous areas
When used in a hazardous area, the thermistor motor protection relays must not be
operated with automatic RESET (terminals Y1 and Y2 permanently jumpered).
User test (repeat test)
Repeat testing in accordance with EN 60079-17 can be combined with the user test.
Operation of the SIRIUS 3RN2 thermistor motor protection relay must be discontinued if test
results are negative.
The test must be performed by a qualified person familiar with the specified standards.
The test function can be activated and a trip simulated by pressing the blue TEST/RESET
button for > 2 s. Correct function is only ensured if the unit is tripped.
Maintenance and repair
These devices are maintenance-free.
Only the manufacturer may perform repairs on the SIRIUS 3RN2 thermistor motor protection
relay.
ATEX
3.2 Use in areas subject to an explosion hazard due to gases or dust
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 19
3.2
Use in areas subject to an explosion hazard due to gases or dust
SIRIUS components meet a wide range of requirements for operation in hazardous areas
and for switching and protecting components used in hazardous areas.
Types of protection in accordance with ATEX Directive 2014/34/EU
3RN2 thermistor motor protection relays are suitable for overload protection of explosion-
proof motors with protection type Ex e. The relays meet the requirements of EN 60079. They
are approved under Device Group II, Category (2) for motors operated in Area "G" (areas in
which potentially explosive gas, vapor, mist, and air mixtures are present) and additionally in
Area "D" (areas containing combustible dust).
The 3RN2 thermistor motor protection relays are not intended for installation in hazardous
areas. If they are installed in a hazardous area, the 3RN2 thermistor motor protection relays
must be adapted to the applicable type of protection.
For 3RN2 thermistor motor protection relays, the EC type examination certificate is available
for Group II, Category (2) G [Ex e] [Ex d] [Ex px] and D [Ex t] [Ex p]. The number is: PTB 15
ATEX 3011
Further information and certificates are available for download on the Internet
(http://www.siemens.com/automation/service&support).
You will find further information on explosion protection (ATEX) on the Internet
(http://www.siemens.com/sirius/atex).
All ATEX-certified 3RN2 thermistor motor protection relays meet the requirements of
Category 2 (EN ISO 13849-1):
● 3RN2011
● 3RN2012-..30
● 3RN20.3
ATEX
3.2 Use in areas subject to an explosion hazard due to gases or dust
SIRIUS 3RN2 thermistor motor protection relay
20 Manual, 10/2016, A5E34244868002A/RS-AA/001
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 21
Description
4
4.1
Device overview
4.2
Device description
General information
SIRIUS 3RN2 thermistor motor protection relays are thermal protection devices that are
suitable, in combination with type A PTC thermistors, for monitoring temperatures of
electrical drives, transformer windings, oils, bearings, air, etc.
The most frequent application is monitoring of three-phase motors in which the motor
manufacturer has fitted a PTC sensor into every winding overhang and in which these PTC
sensors are connected in series.
Description
4.2 Device description
SIRIUS 3RN2 thermistor motor protection relay
22 Manual, 10/2016, A5E34244868002A/RS-AA/001
Type A PTC temperature sensor
If a type A temperature sensor is connected to a thermistor motor protection relay,
compliance with the operating temperatures is assured (on pick-up and reset) according to
IEC 60947-8.
The characteristic curves of the Type A temperature sensors are described in the standards
IEC 60947-8, EN 44081, and EN 44082.
Figure 4-1 Typical characteristic curve of a type A sensor (logarithmic scale)
Depending on the number of sensors connected in series, the following tripping and restart
temperatures will result based on the TNF (rated response temperature of the sensor):
Tripping temperature
Restart temperature
3 sensors
TNF +3K
TNF -7K
6 sensors
TNF -4K
TNF -19K
(The specified temperatures are limit values.)
Description
4.2 Device description
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 23
Color codes
A PTC temperature sensor has a nonlinear change in temperature. However, at a certain
temperature, its resistance increases suddenly. This temperature is known as the rated
response temperature (TNF).
PTC sensors are available on the market with different rated response temperatures, which
are normally chosen by the motor manufacturer based on the maximum permissible motor
temperature and installed in the windings.
Because the resistance characteristic values are identical for all types, you do not need to
concern yourself with the actual temperature limit of the motor. The 3RN2 thermistor motor
protection relay trips reliably when the rated response temperature is exceeded.
You can see the rated response temperatures by the colors of the thermistor sensor cables
because the colors are standardized:
TNF (°C)
Color code
60
white/gray
70 white/brown
80
white/white
90 green/green
100
red/red
110
brown/brown
120
gray/gray
130
blue/blue
140
white/blue
145
white/black
150
black/black
155
blue/black
160
blue/red
170
white/green
180
white/red
Description
4.2 Device description
SIRIUS 3RN2 thermistor motor protection relay
24 Manual, 10/2016, A5E34244868002A/RS-AA/001
Benefit
● Thanks to direct motor protection, overdimensioning of the motors is not necessary
● No settings are required on the SIRIUS thermistor motor protection relay.
● Semiconductor-compatible output thanks to versions with hard gold-plated contacts
● Rapid error diagnosis thanks to SIRIUS thermistor motor protection relays that indicate
wire break and short-circuits in the sensor circuit
● All SIRIUS thermistor motor protection relays have removable terminals
● All SIRIUS thermistor motor protection relays have screw-type terminals or push-in
terminals
Bimetallic switch
In some applications, bimetallic switches (e.g. Klixon, Thermoclick) are used as sensors
instead of PTC temperature sensors. Bimetallic switches are temperature and current-
dependent NC contacts and are available for different temperature ranges.
Because bimetallic switches have practically no resistance below their opening temperature,
short-circuit detection is not possible when using bimetallic switches.
A bimetallic switch can be used for versions 3RN2000 and 3RN2010 on the SIRIUS
thermistor motor protection relay.
Note
Never use bimetallic switches in applications subject to an explosion hazard!
Because of their non
-standardized tripping characteristic, bimetallic switches must
not
be
used in applications where there is an explosion hazard. Use type A PTC sensors instead!
Description
4.3 Device versions
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 25
4.3
Device versions
SIRIUS 3RN2 thermistor motor protection relays are available in the following versions:
● 3RN2000 compact units
● 3RN2010 standard units
● 3RN2012-.BW31 bistable devices
● 3RN2011, 3RN2012-.B.30, 3RN2013 standard units with ATEX approval
● 3RN2023 devices with ATEX approval and 2 sensor circuits for warning and
disconnection
Sizes
The overall height of all 3RN2 thermistor motor protection relays is 100 mm. The overall
depth is a standard 90 mm. The 3RN2 thermistor motor protection relays are designed in two
widths:
● 17.5 mm
This overall width is used for the 3RN2000 compact tripping relays with 1 changeover
contact and with A1 jumpered contact root of the changeover contact and the 3RN2010-
.C.30 with 1 NC contact and 1 NO contact. The units have 8 possible terminals.
● 22.5 mm
This overall width is used for all other relays and provides 12 possible terminals.
You will find the precise dimensions in the Dimension drawings (Page 61) chapter.
4.4
Special features
Operating temperature
For operation from -25 °C to +60 °C, there are no restrictions for the control supply,
switching current, or ON time.
Wide voltage range
All 3RN2 thermistor motor protection relays are available for supply voltages 24 V AC/DC
and 24 to 240 V AC/DC.
Description
4.5 Area of application
SIRIUS 3RN2 thermistor motor protection relay
26 Manual, 10/2016, A5E34244868002A/RS-AA/001
4.5
Area of application
Direct motor protection through temperature monitoring of the motor winding offers 100 %
motor protection even under the most difficult ambient conditions, without the need to make
adjustments on the SIRIUS thermistor motor protection relay. Versions with hard gold-plated
contacts additionally ensure a switching reliability that is higher than that of an electronic
control.
Direct motor protection:
● At increased ambient temperatures
● When switching frequency is too high
● When starting and braking operations are too long
● Used together with frequency converters (low speeds)
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 27
Mounting
5
5.1
Warning notices
Warning notices before installation, wiring, and commissioning
WARNING
Hazardous voltage!
Causes electric shock and burns when touched.
Turn off and lock out all power supplying this device before working on this device.
Note
The following figures are for illustrative purposes only!
The figures below show a 22.5
-mm housing. The o
verall width, overall depth, terminals (type
and number of terminals) and accessories and mounted components are similar may differ
from the actual product.
Mounting
5.2 Terminal coding
SIRIUS 3RN2 thermistor motor protection relay
28 Manual, 10/2016, A5E34244868002A/RS-AA/001
5.2
Terminal coding
You can fit the terminals with coding pins (3ZY1440-1AA00). This helps you to avoid errors
when replacing the terminals.
Mounting
5.3 Mounting the devices on a standard mounting rail
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 29
5.3
Mounting the devices on a standard mounting rail
Requirements
● A horizontal 35-mm wide mounting rail in accordance with DIN EN 60715 has been
properly secured at the installation location.
Procedure
Step
Instructions
Figure
1 Place the back of the device
onto the upper edge of the
standard mounting rail.
2 Press the lower half of the
device against the DIN rail until
the device engages.
Mounting
5.4 Disassembling devices from a standard mounting rail
SIRIUS 3RN2 thermistor motor protection relay
30 Manual, 10/2016, A5E34244868002A/RS-AA/001
5.4
Disassembling devices from a standard mounting rail
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
● The terminals have been removed or disconnected.
Procedure
Step
Instructions
Figure
1 Press the device
downwards.
2 Pull the lower half of the
device away from the
standard mounting rail.
3 Lift the device from the
upper edge of the DIN rail.
Mounting
5.5 Mounting the devices on a wall
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 31
5.5
Mounting the devices on a wall
Requirements
Please note the following requirements for mounting on a level surface:
● A vertical mounting surface is recommended for the housing.
● Two correctly drilled holes, threaded or with plug on the level surface
Refer to the dimension drawings in the Dimension drawings (Page 61) chapter for the
distances between the drill holes.
● Two screws to fit the M4 x 12 holes in accordance with DIN 784.
● Two lugs for screw fastening, you will find the article numbers in the Spare
parts/accessories (Page 67) chapter.
Procedure
Step
Instructions
Figure
1 Insert the securing brackets
into the openings provided
on the device until they
engage.
2 Hold the device up to the
level surface prepared for
screw fastening.
3 Insert the head screws
through the corresponding
elongated holes in the fixing
lugs.
4 Screw the device securely
onto the level surface.
Tightening torque: 1 Nm
Mounting
5.6 Removing the devices from the wall
SIRIUS 3RN2 thermistor motor protection relay
32 Manual, 10/2016, A5E34244868002A/RS-AA/001
5.6
Removing the devices from the wall
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
● The terminals have been removed or disconnected.
Procedure
Step
Instructions
Figure
1
Hold the device firmly.
2
Unscrew the cap screws.
3 Lift the device from the level
surface.
4 Remove the securing
brackets from the device.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 33
Connection 6
6.1 Terminal assignment
Location of the connections
The inside faces of the terminal covers are labeled with the designations of the relevant
terminals. The position of the label corresponds to the position of the respective terminal.
NOTICE
Risk of property damage
When using the terminals, you must observe the correct position of the terminals (see
inside of cover).
Upper terminal cover Lower terminal cover
Connection
6.1 Terminal assignment
SIRIUS 3RN2 thermistor motor protection relay
34 Manual, 10/2016, A5E34244868002A/RS-AA/001
Terminal cover
Note
Terminal cover/article number
The complete article number is engraved on each terminal cover (upper and lower) via laser.
The article numbers permit correct assignment of the terminal cover to the unit if you have
removed the terminal cover. If a terminal cover is lost or damaged, you can simply print out
the
figures of the following table in their original size, and glue them into a neutral
replacement terminal cover. You can obtain replacement terminal covers from Siemens
Support.
You can use the terminal labels for modules with screw
-type terminals and spring-loaded
terminals.
Parts of the article numbers that are not necessary for assignment to the terminal functions
have been replaced by periods as placeholders.
Connection
6.1 Terminal assignment
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 35
The following tables shows the terminal assignments in the terminal covers of the SIRIUS
thermistor motor protection relays:
Module version
Inscription of the terminal cover
Upper
terminal cover
Lower
terminal cover
Terminal
assignment
on the device
Overall width 17.5 mm
Compact units
3RN2000-.AA30
3RN2000-.AW30
Standard units
3RN2010-.CA30
3RN2010-.CW30
Connection
6.1 Terminal assignment
SIRIUS 3RN2 thermistor motor protection relay
36 Manual, 10/2016, A5E34244868002A/RS-AA/001
Module version
Inscription of the terminal cover
Upper
terminal cover
Lower
terminal cover
Terminal
assignment
on the device
Overall width 22.5 mm
Standard units
3RN2010-.BA30
3RN2010-.BW30
3RN2011-.BA30
3RN2011-.BW30
3RN2012-.BA30
3RN2013-.BA30
3RN2012-.BW3.
3RN2013-..W30
Connection
6.1 Terminal assignment
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 37
Module version
Inscription of the terminal cover
Upper
terminal cover
Lower
terminal cover
Terminal
assignment
on the device
Overall width 22.5 mm
"Warning and
tripping" device
3RN2023-.DW30
The table below contains an explanation of the terminal cover designations used:
Terminal designation
Explanation
A1/11 (applies to 3RN2000 only) Rated control supply voltage ~/+
Output relay K1 CO contact root
A1(+)
Rated control supply voltage ~/+
A2(-)
Rated control supply voltage ~/-
T1
Thermistor connection contact 1
T2
Thermistor connection contact 2
1T1 (applies to 3RN2023 only)
Thermistor connection for sensor circuit 1, contact 1
2T1 (applies to 3RN2023 only)
Thermistor connection for sensor circuit 2, contact 1
T2 (applies to 3RN2023 only)
Thermistor connection, common contact 2
Y1 and Y2 Connection for remote RESET (NO contact)
Y1 and Y2 jumpered: Auto RESET
12NC
Output relay K1 CO contact NC contact
11C
Output relay K1 CO contact root
14NO
Output relay K1 CO contact NO contact
22NC
Output relay K2 CO contact NC contact
21C
Output relay K2 CO contact root
24NO
Output relay K2 CO contact NO contact
23NO/24NO (applies to 3RN2023 only)
Output relay K2 NO contacts (warning)
Connection
6.2 Connection data for terminals
SIRIUS 3RN2 thermistor motor protection relay
38 Manual, 10/2016, A5E34244868002A/RS-AA/001
6.2
Connection data for terminals
Specification and value for
removable terminals with screw-
type terminals
Specification and value for
removable terminals with spring-
loaded terminals (push-in
terminals)
Screwdriver
Cross-tip screwdriver
Size: PZ 1 x 80 (∅ 4.5 mm)
Torque: 0.6 … 0.8 Nm
(5.2 ... 7.0 lb/inch)
Flat-head screwdriver
(3RA2908-1A)
Size: 3 mm for operating the
springs DIN 5264-A; 0.5 x 3
Rigid cable
A = 10 mm
1 x 0.5 ... 4.0 mm2
2 x 0.5 ... 2.5 mm2
A = 10 mm
1 x 0.5 ... 4.0 mm2
Flexible conductor with end
sleeve
A = 10 mm
1 x 0.5 ... 4.0 mm2
2 x 0.5 ... 1.5 mm2 1)
A = 10 mm
1 x 0.5 ... 2.5 mm2
Flexible cable
Not permissible A = 10 mm
1 x 0.5 ... 4.0 mm2
AWG 1 x 20 … 12
2 x 20 … 14
1 x 20 … 12
1)
When 2 x 1.0 mm2 end sleeves with a plastic sleeve are used, space problems may arise with the
sleeves; as an alternative, you are advised to use end sleeves without plastic sleeves.
Connection
6.3 Connecting the screw-type terminals
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 39
6.3 Connecting the screw-type terminals
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
● Cross-tip screwdriver size PZ 1 x 80
● For suitable connection cross-sections of the cables, see the Connection data for
terminals (Page 38) chapter
Procedure
Step Instructions Figure
1 Insert the relevant cable into
square on the screw-type
terminal until it engages.
Hold the cable in the screw
terminal.
2 Tighten the screw with a
torque of 0.6 to 0.8 N.
3 Pull on the cable to ensure it
is screwed tight.
Connection
6.4 Disconnecting the screw-type terminals
SIRIUS 3RN2 thermistor motor protection relay
40 Manual, 10/2016, A5E34244868002A/RS-AA/001
6.4
Disconnecting the screw-type terminals
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
● Cross-tip screwdriver size PZ 1 x 80
Procedure
Step
Instructions
Figure
1 Unscrew the screw of the
screw-type terminal.
2 Remove the cable from the
unscrewed screw-type
terminal.
Connection
6.5 Wiring rules for spring-loaded terminals (with push-in technology)
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 41
6.5
Wiring rules for spring-loaded terminals (with push-in technology)
Notes on handling spring-loaded terminals with push-in technology
The space for the spring-loaded terminals is rectangular. The maximum overall dimensions
of the conductor to be wired must not exceed 2.4 x 2.8 mm.
Take note of the orientation of the terminal area, which may require vertical fitting of
rectangular-crimped conductors.
To make optimum use of available terminal area, you are advised to choose a form of
crimping that creates a corresponding rectangular contour. Trapezoidal crimping is highly
suitable in this case.
When a conductor is used that utilizes the full overall height, the terminal spring is deflected
to the maximum. It may therefore be difficult to remove this conductor because it requires
further deflection of the spring.
Connection
6.6 Connect the spring-loaded terminal (push-in)
SIRIUS 3RN2 thermistor motor protection relay
42 Manual, 10/2016, A5E34244868002A/RS-AA/001
6.6
Connect the spring-loaded terminal (push-in)
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
The spring-loaded (push-in) connections allow wiring without tools for rigid conductors or
conductors equipped with end sleeves.
For wiring finely-stranded or stranded conductors without end sleeves on spring-loaded
(push-in) terminals, a screwdriver is required to open the spring terminal.
Requirements
● DIN 5264 screwdriver with size 0.5 x 3 mm (for finely-stranded conductors only).
(Article number of the screwdriver: 3RA2908-1A)
● For suitable conductor cross sections, see the Connection data for terminals (Page 38)
chapter
Connection
6.6 Connect the spring-loaded terminal (push-in)
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 43
Procedure
Table 6- 1 Rigid conductors or conductors equipped with end sleeves
Step
Instructions
Figure
1 Insert the cable into the oval
opening as far as it will go.
2 Pull on the cable to ensure it is tight.
Table 6- 2 Finely stranded cables without end sleeve
Step
Instructions
Figure
1 Insert the screwdriver in the
rectangular opening to open the
terminal spring (oval opening).
2 Insert the cable as far as it will go
into the oval opening and remove
the screwdriver.
3 Pull on the cable to ensure it is tight.
Connection
6.7 Disconnect the spring-loaded terminal (push-in)
SIRIUS 3RN2 thermistor motor protection relay
44 Manual, 10/2016, A5E34244868002A/RS-AA/001
6.7
Disconnect the spring-loaded terminal (push-in)
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
● DIN 5264 screwdriver with size 0.5 x 3 mm
(article number of the screwdriver: 3RA2908-1A)
Procedure
Step
Instructions
Figure
1 Insert the screwdriver into
the rectangular opening of
the spring-loaded terminal
until it engages.
2 Remove the cable from the
oval opening.
3 Remove the screwdriver.
Connection
6.8 Attaching the terminals
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 45
6.8
Attaching the terminals
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
Requirements
You must have removed the terminals, for the purpose of replacing a device, for example.
Procedure
Note
Screw-type terminals/push-in terminals
Screw
-type and push-in terminals are inserted into the module using the same principle.
Step
Instructions
Figure
1 Insert the detachable
terminals into the guide rail
of the device.
2 Slide the detachable
terminals back until they
audibly engage.
Connection
6.9 Removing the terminals
SIRIUS 3RN2 thermistor motor protection relay
46 Manual, 10/2016, A5E34244868002A/RS-AA/001
6.9
Removing the terminals
WARNING
Hazardous Voltage
Can Cause Death, Serious Injury, or Damage to Property.
Before starting work, therefore, disconnect the system and devices from the power supply.
Procedure
Note
Screw-type terminals/push-in terminals
Screw
-type and push-in terminals are removed from the module on the same principle.
Step
Instructions
Figure
1 Press the clip of the terminals
upwards.
2
Pull the terminals out to the front.
3 Lift the terminals out of the guide
rail of the device.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 47
Functions
7
The SIRIUS 3RN2 thermistor motor protection relays operate in accordance with the closed-
circuit principle and therefore monitor themselves for loss of supply voltage. The exceptions
are the warning output on device 3RN2023, which always works on the open-circuit
principle, and the bistable relays of the 3RN2012-.BW31, which always retain the last
switching state. A micro-interruption in the power supply of less than 30 ms does not change
the status of the output relays. In the event of longer voltage dips or an extremely slow
increase in the supply voltage, the devices may enter into a system stop in which the output
relays drop out (exception: 3RN2012-.BW31) and the devices are only functional again 1)
after restarting the system. The flashing red LED (TRIPPED) indicates a system stop.
1)
NOTICE
Restart
Disconnect the devices from the supply voltage for at least 1 s before restarting the system.
The 3RN2011, 3RN2012, 3RN2013, and 3RN2023 devices are additionally equipped with
wire-break and short-circuit detection in the sensor circuit.
3RN2000 compact unit
The compact unit, which is only 17.5 mm wide, is equipped with a red LED (TRIPPED) for
the tripped indicator and a changeover contact. After the unit has tripped, it is automatically
reset once the thermistors have cooled down. The root of the changeover contact is
connected to the control voltage (terminal 11 is connected to terminal A1). This unit is
particularly suitable in circuits in which the control circuit and signaling circuit have the same
potential, e.g. in local control cabinets.
Functions
SIRIUS 3RN2 thermistor motor protection relay
48 Manual, 10/2016, A5E34244868002A/RS-AA/001
3RN2010, 3RN2011, 3RN2012, and 3RN2013 standard units
The standard units are equipped with two LEDs (READY and TRIPPED) for an operating
and tripped display and are available with either 1 NO + 1 NC contacts (3RN2010, overall
width 17.5 mm) or with 2 CO contacts. Depending on the version, they are available with
Auto RESET (3RN2010), Manual/Remote RESET (3RN2011 – Remote RESET only by
switching the unit off and on again, as no Y1/Y2 terminals available) or Manual/Auto and
Remote RESET (3RN2012 and 3RN2013). Remote RESET can be achieved by connecting
an external pushbutton with a normally-open function to terminals Y1 and Y2
(3RN2012/3RN2013) or by switching the unit off and on again (3RN2011). If terminals Y1
and Y2 are jumpered, the unit is automatically reset once the thermistors have cooled down
(Auto RESET). The 3RN2012 and 3RN2013 units are non-volatile. This means a previous
trip remains stored in the event of a control supply voltage failure. The thermistor motor
protection relay remains in the safe state with an opened output relay until it is intentionally
reset by pressing the TEST/RESET button of the unit or an external pushbutton.
When using the 3RN2012-.BW31 devices with bistable relays, the switching status of the
output relays does not change in the event of a loss of supply voltage or a system stop, but
the connected motor is no longer monitored. Separate supply voltage monitoring is therefore
recommended.
3RN2023 "Warning and tripping" thermistor motor protection relays
You can connect two sensor circuits to one 3RN2023 thermistor motor protection relay that
act on two separate output relays with 1 NO contact for warning and 1 CO contact for
tripping. Thermistors with different rated response temperatures TNF are used to implement
the "Warning" and "Tripping" functions. When sensor circuit 2 for "Warning" responds, a
yellow LED is lit and when the "Tripping" circuit responds, a red LED is lit. The sensor
circuits have different reset response and operating behavior: "Warning" thermistor sensor
circuit 2, (terminals 2T1, T2) works only with Auto RESET and according to the open-circuit
principle (output relay K2, NO contact). "Tripping" thermistor sensor circuit 1, (terminals 1T1,
T2) can be changed from Manual RESET to Auto RESET by jumpering terminals Y1 and Y2.
Remote RESET is implemented by connecting an external pushbutton with a normally-open
function to these terminals.
Note
Devices with ATEX approval
Note that not all devices have ATEX approval.
All devices with article numbers 3RN2011, 3RN2012
-.B.30, 3RN2013, and 3RN2023 have
ATEX approval.
All devices with article numbers 3RN2000, 3RN2010 and 3RN2012
-..31 (bistable type) do
NOT
have ATEX approval.
In this regard, please also note the information in the
Safety and commissioning instructions
for hazardous areas
(Page 15) chapter.
Functions
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 49
Performing the device self-test/RESET
Device self-test
A device self-test is performed when the supply voltage is applied, or when the test function
is triggered, or cyclically during operation. The starting time is approx. 0.6 s.
The self-test comprises the following actions:
● Internal memory test
● Testing of the sensor circuit for tripping
When the supply voltage is applied, an LED test is additionally performed. The test involves
all LEDs lighting up for 2 s.
If the self-test finds an error, the unit shuts down automatically, i.e. all LEDs switched off and
output relays opened.
Test function
When not tripped, you can call the test function by pressing the blue TEST/RESET button for
longer than 2 s. This simulates tripping the unit due to overtemperature. The test performs
an internal device self-test and ensures the function of the display LEDs and the output
relay, and All LEDs light up. If Auto RESET is activated, the test function is automatically
reset.
After you have triggered the test function, you have to reset the thermistor motor protection
relay separately with manual RESET selected.
Note
Switching on
During switch
-on (application of a voltage), you must not press the TEST/RESET button.
In this time (starting time), the thermistor motor protection relay checks whether the
TEST/RESET button is short
-circuited.
Functions
SIRIUS 3RN2 thermistor motor protection relay
50 Manual, 10/2016, A5E34244868002A/RS-AA/001
Auto RESET
Once the sensor circuit has cooled down, the 3RN2000 and 3RN2010 thermistor motor
protection relays are automatically reset. You can activate this function on the units with
remote RESET (3RN2012, 3RN2013, and 3RN2023) with an external jumper across
terminals Y1 and Y2.
NOTICE
Motor startup
The motor must not start up automatically following tripping. You must not use "Automatic
RESET" mode in applications where there is a risk of personal injury or damage to property
if the motor restarts unexpectedly.
You will find a typical circuit diagram of separate motor starting irrespective of the selected
RESET behavior of a thermistor motor protection relay in the Circuit diagrams (Page 65)
chapter.
Manual RESET
With the blue TEST/RESET button, you can reset a tripped thermistor motor protection relay
again, assuming the sensor circuit for tripping has cooled down again (i.e. resistance of the
PTC sensor < 1500 Ω). For this purpose, the blue TEST/RESET button must be kept
pressed for between 0.5 and 2 s.
Remote RESET
You can reset a tripped unit again using the pushbutton with a floating NO contact at
terminals Y1 and Y2, provided the sensor circuit for tripping has cooled down again (i.e.
resistance of the PTC sensor < 1500 Ω).
Remote RESET possible by disconnecting the supply voltage
On the 3RN2011 thermistor motor protection relay, there is a further way of triggering a
remote RESET, namely by switching the supply voltage off and then on again. This requires
the sensor circuit for tripping to have cooled down (i.e. the resistance of the PTC sensor <
1500 Ω). To safely ensure a complete device reset, you must switch off the supply voltage
for at least 500 ms.
All other versions with manual RESET have a non-volatile error memory. This error memory
permits a RESET after a trip only by operation of the pushbutton on the device or a
connected NO contact, at terminals Y1/Y2.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 51
Alarm, error and system messages
8
8.1
Function charts
Figure 8-1 3RN2000, 3RN2010 time diagram
Figure 8-2 3RN2011 time diagram – reset via pushbutton or voltage interruption
Alarm, error and system messages
8.1 Function charts
SIRIUS 3RN2 thermistor motor protection relay
52 Manual, 10/2016, A5E34244868002A/RS-AA/001
Figure 8-3 3RN2012, 3RN2013 time diagram – reset via remote and pushbutton
Figure 8-4 3RN2012-.BW31 time diagram – reset via remote or voltage interruption
Alarm, error and system messages
8.1 Function charts
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 53
Figure 8-5 3RN2023 time diagram – reset via remote and pushbutton
Alarm, error and system messages
8.2 LED displays
SIRIUS 3RN2 thermistor motor protection relay
54 Manual, 10/2016, A5E34244868002A/RS-AA/001
8.2
LED displays
The table below applies to the following modules:
● 3RN2000-.AA30
● 3RN2000-.AW30
TRIPPED
Meaning
OFF • Temperature below the permitted limit, or
• No power supply
ON
Temperature above the permitted limit
The table below applies to the following modules:
● 3RN2010-.CA30
● 3RN2010-.CW30
● 3RN2010-.BA30
● 3RN2010-.BW30
READY
TRIPPED
Meaning
ON
OFF
Temperature below the permitted limit
ON
ON
Temperature above the permitted limit
OFF OFF • No supply voltage, or
• Device defective
Alarm, error and system messages
8.2 LED displays
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 55
The table below applies to the following modules:
● 3RN2011-.BA30
● 3RN2011-.BW30
● 3RN2012-.BA30
● 3RN2012-.BW30
● 3RN2012-.BW31
● 3RN2013-.BA30
● 3RN2013-.BW30
● 3RN2013-.GW30
READY
TRIPPED
Meaning
ON ON • Self-test is being performed (on startup or after pressing the
TEST/RESET button > 2 s)
• Temperature above the permitted limit
ON
flickering
Short circuit in the sensor circuit
ON
flashing
Wire break in the sensor circuit
ON OFF Temperature below the permitted limit
OFF
flashing
Device in system STOP following inadequate supply voltage
1)
OFF OFF • No supply voltage, or
• Device defective
1)
NOTICE
Restart required
The device must be disconnected from the supply voltage for at least 1 s before restarting
the system.
Alarm, error and system messages
8.2 LED displays
SIRIUS 3RN2 thermistor motor protection relay
56 Manual, 10/2016, A5E34244868002A/RS-AA/001
The table below applies to the following module: 3RN2023-.DW30
READY
WARNING
TRIPPED
Meaning
ON ON ON • Self-test is being performed (on startup or after pressing the
TEST/RESET button > 2 s)
• Temperature above the permitted limit
ON
flickering
flickering
Short-circuit in the sensor circuits
ON
flashing
flashing
Wire break in the sensor circuits, or common T2
ON OFF OFF Temperature below the permitted limit
ON ON OFF Temperature has exceeded warning threshold but is below the trip
threshold
OFF
OFF
flashing
Device in system STOP following inadequate supply voltage
1)
OFF OFF OFF • No power supply
• Device defective
• Error detected during self-test
• Switch-on/switch-off process
1)
NOTICE
Restart required
The device must be disconnected from the supply voltage for at least 1 s before restarting
the system.
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 57
Technical data
9
9.1
Technical data in Siemens Industry Online Support
Technical data sheet
You can also find the technical data of the product at Siemens Industry Online Support
(https://support.industry.siemens.com/cs/ww/en/ps/24302/td).
1. Enter the full article number of the desired device in the "Product" field, and confirm with
the Enter key.
2. Click the "Technical data link.
Technical data
9.1 Technical data in Siemens Industry Online Support
SIRIUS 3RN2 thermistor motor protection relay
58 Manual, 10/2016, A5E34244868002A/RS-AA/001
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 59
CAx data
10
You can find the CAx data in the Siemens Industry Online Support
(https://support.industry.siemens.com/cs/ww/en/ps/24302/td).
1. Enter the full article number of the desired device in the "Product" field, and confirm with
the Enter key.
2. Click the "CAx data link.
CAx data
SIRIUS 3RN2 thermistor motor protection relay
60 Manual, 10/2016, A5E34244868002A/RS-AA/001
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 61
Dimension drawings
11
Figure 11-1 Enclosure 17.5 mm for SIRIUS 3RN2 thermistor motor protection relays
Dimension drawings
SIRIUS 3RN2 thermistor motor protection relay
62 Manual, 10/2016, A5E34244868002A/RS-AA/001
Figure 11-2 Drilling diagram, enclosure 17.5 mm
Dimension drawings
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 63
Figure 11-3 Enclosure 22.5 mm (short) for SIRIUS 3RN2 thermistor motor protection relays
Dimension drawings
SIRIUS 3RN2 thermistor motor protection relay
64 Manual, 10/2016, A5E34244868002A/RS-AA/001
Figure 11-4 Drilling diagram, enclosure 22.5 mm
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 65
Circuit diagrams
12
The following figure shows a sample circuit for a 3RN2012 or 3RN2013 thermistor motor
protection relay.
A1(+)
Rated control supply voltage ~/+
A2(-)
Rated control supply voltage ~/-
K
Contactor relay
M
Motor
S
NO contact, latching
S1
NO contact 1
S2
NO contact 2
S3
NO contact 3
T1
Thermistor connection contact 1
T2
Thermistor connection contact 2
Y1, Y2 Connection for remote RESET (NO contact)
Y1 and Y2 jumpered: Auto RESET
Circuit diagrams
SIRIUS 3RN2 thermistor motor protection relay
66 Manual, 10/2016, A5E34244868002A/RS-AA/001
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 67
Spare parts/accessories
13
The table below shows the accessories available for the SIRIUS 3RN2 thermistor motor
protection relays:
Designation
Graphic
Article number
SIRIUS terminal, 2-pole, screw-type, 1 x 2.5 mm²
3ZY1122-1BA00
SIRIUS terminal, 2-pole, push-in, 1 x 2.5 mm²
3ZY1122-2BA00
SIRIUS lugs for screw fastening for wall mounting
(Contents: 12 units)
3ZY1311-0AA00
Coding pins for SIRIUS terminals
3ZY1440-1AA00
Spare parts/accessories
SIRIUS 3RN2 thermistor motor protection relay
68 Manual, 10/2016, A5E34244868002A/RS-AA/001
SIRIUS 3RN2 thermistor motor protection relay
Manual, 10/2016, A5E34244868002A/RS-AA/001 69
Index
"
"Warning and tripping" device, 37
3
3RN2000, 3RN2010 time diagram, 51
3RN2011 time diagram – reset via pushbutton or
voltage interruption, 51
3RN2012, 3RN2013 time diagram – reset via remote
and pushbutton, 52
3RN2012-.BW31 time diagram – reset via remote or
voltage interruption, 52
3RN2023 "Warning and tripping" thermistor motor
protection relays, 48
A
Accessories, 67
Application, 26
Applications & Tools, 9
Approvals, 11
Article No. scheme, 12
ATEX, 15, 19
B
Basic knowledge, 7
C
Cable routing, 16
CAx data, 8, 59
Circuit diagram example, 65
Commissioning, 17
Compact units, 35
Conductor cross section, 16
Connection, 33
Connections, 33
Contamination, 13
CSA, 11
D
DataMatrix code, 10
Declaration of Conformity, 11
Device description
Benefit, 24
Bimetallic switch, 24
Color codes, 23
General information, 21
Restart temperature, 22
Tripping temperature, 22
Type A PTC temperature sensor, 22
Device overview, 21
Device self-test, 49
Device versions, 25
Dimension drawings, 61
Disassembly
Devices on a standard mounting rail, 30
Devices on a wall, 32
Disposal, 13
E
Electrostatic charging, 13
F
Functions, 48
Compact unit, 47
Standard units, 48
I
Installation, 17
Devices on a standard mounting rail, 29
Devices on a wall, 31
Intended use, 14
L
LED displays, 54
Index
SIRIUS 3RN2 thermistor motor protection relay
70 Manual, 10/2016, A5E34244868002A/RS-AA/001
M
Maintenance, 18
Module version, 35, 36
My Documentation Manager, 9
N
Notes on configuration, 18
O
Online Support, 7
Operating temperature, 25
Operational safety, 14
P
Procedure
Auto RESET, 50
Device self-test, 49
Manual RESET, 50
Remote RESET, 50
Remote RESET possible by disconnecting the
supply voltage, 50
Test function, 49
Product data sheet, 59
Product Support, 8
Provisions, 11
Push-in technology, 41
R
Recycling, 13
Regulations, 11
Repair, 18
RESET, 49
S
Safety data, 17
Safety information, 13, 14
Screw-type terminals
Connection, 39
Disconnection, 40
Shipbuilding approval, 11
SIEMENS Industry Support App, 10
Sizes, 25
Spare parts, 67
Spring-loaded terminal
Connection, 42
Disconnection, 44
Wiring rules, 41
Standard units, 35, 36
Standards, 11, 15
T
Terminal coding, 28
Terminal cover, 34
Inscription, 35, 36
lower, 33
upper, 33
Terminals
Connection data, 38
Plug in, 45
Removal, 46
Screw-type terminals, 38
Spring-loaded terminals, 38
Types of protection, 19
U
UL, 11
User test, 18
W
Warning notices
Commissioning, 27
Installation, 27
Wiring, 27
Wide voltage range, 25