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 planned
50,75,100 4-20 APR 100 B420L planned
100,150,200 4-20 APR 200 B420L 46317
200,300,400 4-20 APR 400 B420L 46291
R LLoad resistance
(See the graph "Load Resistance vs. Supply Voltage") < 350 Ω
VCSupply voltage (loop powered) + 12 .. 24 V DC
ISL Output current limitation < 25 mA
ÎPOverload capability 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
General data
TAAmbient operating temperature - 20 .. + 60 °C
TSAmbient storage temperature - 20 .. + 85 °C
mMass 90 g
IPxx Protection degree IP20
AC Current transducer APR-B420L
Split core transducer for the electronic measurement distorted AC
waveforms current, with galvanic isolation between the primary circuit
(power) and the secondary circuit (measurement). Switch selectable
ranges and True RMS 4-20mA current output.
IPN = 10 .. 400 A
Features
• VFD and SCR waveforms current
measurement
• True RMS output
•Split core type
• Loop powered 4-20mA current output
• DIN mounting & Panel mounting
• Eliminates insertion loss
• Switch selectable ranges
• Isolated plastic case recognized
according to UL94-V0.
Advantages
• Large aperture for cable up to
Ø18mm
• High isolation between primary and
secondary circuits
• 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
070125/4 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 1/3
Current Transducer APR-B420L
Isolation characteristics
VbRated isolation voltage rms 300 V
with IEC 61010-1 standards and following conditions :
-Single insulation
-Over voltage category CAT III
-Pollution degree PD2
-Heterogeneous field
VdRms voltage for AC isolation test, 50 Hz, 1min 5kV
VePartial discharge extinction voltage rms @ 10 pC 1.5 kV
VwImpulse withstand voltage 1.2/50 µs6.1 kV
If insulated cable is used for the primary circuit, the voltage category
could be improved with the following table :
Cable insulation (primary) Category
HAR 05 600V CAT III
HAR 07 1000V CAT III
dCp Creepage distance 5.5 mm
dCl Clearance distance 5.5 mm
CTI Comparative tracking index (Group I) 600
070125/4 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 2/3
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the
manufacturer’s operating instructions.
Installation and maintenance should be done with main power supply
disconnected.
The operator must have an accreditation to install this material.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (e.g. primary conductor, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
The user must take care of all protection guarantee against electrical shock.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation. A protective housing or additional shield could be used.
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.
Load Resistance vs. Supply Voltage
0
5
10
15
20
25
30
050 100 150 200 250 300 350 400
Load Resistance
Supply Voltage
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
Meter, etc,)
AP/APR
Connector
Front
070125/4 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 3/3