Electrical data
Primary Nominal Current Output Current Type RoHS since
IPN (A.t.rms) IOUT (mA) date code
10,25,50 4-20 APR 50 B420L 46354
50,75,100 4-20 APR 100 B420L 47009
100,150,200 4-20 APR 200 B420L 46317
200,300,400 4-20 APR 400 B420L 46291
R LLoad resistance, with VC = + 24 V DC 1) < 350 Ω
VCSupply voltage (loop powered) + 12 .. 24 V DC
ISL Output current limitation 2) < 25 mA
ÎPOverload capability 3) no limitation
Accuracy-Dynamic performance data
XAccuracy @ IPN, TA = 25°C (excluding offset) < ± 1 % of IPN
εLLinearity error (0 .. ± IPN)< ± 0.5 % of IPN
IOE Electrical offset current @ TA = 25°C 4mA
TCIOE Temperature coefficient of IOE ± 1 µA/K
TCIOUT Temperature coefficient of IOUT (% of reading) ± 0.1 %/K
t rResponse time to 90% of IPN step < 400 ms
BW Frequency bandwidth (± 1 %) 30 .. 6000 Hz
AC Current transducer APR-B420L
Split-core transducer for the electronic measurement of AC currents (all
waveforms), with galvanic isolation between the primary circuit (high
power) and the secondary circuit (electronics). Switch selectable
measuring ranges and True RMS 4-20mA current output (loop powered).
IPN = 10 .. 400 A
Features
• VFD and SCR waveform currents
measurement
• True RMS output
•Split-core type
• Loop powered 4-20mA current output
• DIN rail or Panel mounting
• Switch selectable measuring ranges
• Isolated plastic case recognized
according to UL94-V0.
Advantages
• Large aperture for cable up to
Ø18mm
• High isolation between primary and
secondary circuits
• Eliminates insertion loss
• Easy installation
Applications
• VFD Controlled Loads:
VFD output indicates how the motor
and attached load are operating.
• SCR Controlled Loads:
Acurate measurement of phase
angle fired or burst fired (time
proportioned)
SCRs. Current measurement gives
faster response than temperature
measurement.
• Switching Power Supplies and
Electronic Ballasts:
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
Application domain
• Energy and Automation
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 1/4
Load Resistance vs. Supply Voltage
0
5
10
15
20
25
30
050 100 150 200 250 300 350 400
Load Resistance
Supply Voltage
Notes :1) Max. Load Resistance vs. Supply Voltage
2) The output current will never exceed this value for safety and protection
reasons. The output value is not valid when measuring above the primary
nominal current value.
3) Although the transducer can withstand very high currents, the measuring
performance specified in the datasheet is valid within the 4-20 mA output
range only.
Current Transducer APR-B420L
General data
TAAmbient operating temperature - 20 .. + 60 °C
TSAmbient storage temperature - 20 .. + 85 °C
mMass 90 g
IPxx Protection degree IP20
Isolation characteristics
VbRated isolation voltage rms 4) 300 V
with IEC 61010-1 standards and following conditions :
-Reinforced isolation
-Over voltage category CAT III
-Pollution degree PD2
-Heterogeneous field
VdRms voltage for AC isolation test 5), 50 Hz, 1min 5kV
VePartial discharge extinction voltage rms @ 10 pC 1.5 kV
VwImpulse withstand voltage 1.2/50 µs6.1 kV
dCp Creepage distance 5.5 mm
dCl Clearance distance 5.5 mm
CTI Comparative tracking index (Group I) 600
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 2/4
Notes :4) If insulated cable is used for the primary circuit, the voltage category could
be improved according to the insulation characteristics given by the cable
manufacturer.
e.g.
Cable insulation (primary) Category
HAR 05 600V CAT III
HAR 07 1000V CAT III
5) Between primary (completely filling the aperture) and secondary.
Safety and warning notes
In order to guarantee safe operation of the transducer and to be able to make proper use of all features and functions,
please read these instructions thoroughly!
Safe operation can only be guaranteed if the transducer is used for the purpose it has been designed for and within
the limits of the technical specifications.
Ensure you get up-to-date technical information that can be found in the latest associated datasheet under www.lem.com.
Caution! Risk of danger
Ignoring the warnings can lead to serious injury and/or cause damage!
The electric measuring transducer may only be installed and put into operation by qualified personnel that
have received an appropriate training.
The corresponding national regulations shall be observed during installation and operation of the transducer
and any electrical conductor.
The transducer shall be used in electric/electronic equipment with respect to applicable standards and safety
requirements and in accordance with all the related systems and components manufacturers’ operating
instructions.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module may carry hazardous live voltage (e.g.
primary conductor, power supply).
The user shall ensure to take all measures necessary to protect against electrical shock.
The transducer is a built-in device containing conducting parts that shall not be accessible after installation.
A protective enclosure or additional insulation barrier may be necessary.
The transducer shall not be put into operation if the jaw opening is open (split core version) or the installation
is not completed.
Installation and maintenance shall be done with the main power supply disconnected except if there are no
hazardous live parts in or in close proximity to the system and if the applicable national regulations are fully
observed.
Safe and trouble-free operation of this transducer can only be guaranteed if transport, storage and installation are carried
out correctly and operation and maintenance are carried out with care.
Current Transducer APR-B420L
071022/6 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 3/4
Dimensions AP(R)-B420L (unit : mm, 1mm = 0.0394 inch)
Connections
•Wires up to ∅ 2 mm
•Female connector provided (spring terminal blocks)
•User-friendly spring-cage connection for no-tool direct
conductor connection
Mechanical characteristics
•General tolerance ± 1 mm
•Primary aperture ∅ 18.5 mm
•Panel mounting 2 holes ∅ 4.0 mm
•Distance between holes 40.0 mm
For panel mounting, replace M4 screws by new one (not
supplied) with appropriate length to panel´s thickness.
Front View
Bottom View
Left View
Axis of aperture
Plug-in connector included : XW4B-03C1-H1 (OMRON)
(distance between screws)
55
40
33.50
20 Range Selection Switch
67
69
21
37
DIN size
35.50
14.80
25
16.40
4.70
18.50
18.50
Ip
Is
OUT
+24VDC
GND
Ip
Is
OUT
+24VDC
GND
Load
(+)
2(-)
(-)
1(+)3none
Output
Range Switch
4-20mA
24 VDC Power
(Controller,
AP/APR
Connector
Front
071022/6 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 4/4