090609/6 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
Page 1/3
IPN = 5 .. 150 A
Features
RMS output ●
Loop-powered 4-20mA current ●
output
Split-core type ●
Ø 16 mm sensing aperture for ●
non-contact measurement
Terminal output ●
Isolated plastic case recognized ●
according to UL 94-V0.
Advantages
High isolation between primary ●
and secondary circuits
Compact case ●
Cost-effective solution ●
Easy installation ●
Applications
Automation and Supervision ●
Current measurement for process
regulation by distributed PLCs
or remote control (e.g. SCADA
software)
Safety and Condition ●
Monitoring
Load monitoring for protection
systems and predictive
maintenance (e.g. conveyers,
pumps or HVAC motors)
Energy management ●
Convenient connection to power
consumption sub-meters
Application domain
Energy and Automation ●
15
20
25
30
35
400 500 600 700 800 900 1000
Max. Load Resistance (Ohm)
Supply Voltage (V)
Electrical data
Primary nominal current rms Output current Type
IPN (A.t.Rms) IOUT (mA)
54-20 AT 5 B420L
10 4-20 AT 10 B420L
20 4-20 AT 20 B420L
50 4-20 AT 50 B420L
100 4-20 AT 100 B420L
150 4-20 AT 150 B420L
R LLoad resistance, with VC = + 24 V DC 1) < 600 W
VCSupply voltage (loop-powered) + 20 .. 30 V DC
ISL Output current limitation < 30 mA
ÎPOverload capability - continuous 120 % of IPN
- 1 min 150 % of IPN
Performance data
XAccuracy @ IPN, TA = 25°C (excluding offset) < ± 2 % of IPN
εLLinearity error < ± 0.5 %
IOE Electrical offset current, TA = 25°C 4 ± 0.2 mA
t rResponse time to 90% of IP step < 100 m s
BW Frequency bandwidth 50/60 Hz
General data
TAAmbient operating temperature - 20 .. + 60 °C
TSAmbient storage temperature - 20 .. + 85 °C
mMass 90 g
IPxx Protection degree IP40
AC Current transducer AT-B420L
Split-core transducer for the electronic measurement of AC waveform
currents, with galvanic isolation between the primary circuit (power) and the
secondary circuit (measurement). 4-20mA current output proportional to
the RMS value of the primary current.
IPN = 5 .. 150 A
071115/4 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
Features
•RMS output
•Loop-powered 4-20mA current output
•Split-core type
•Ø 16 mm sensing aperture for non-
contact measurement
•Terminal output
•Isolated plastic case recognized
according to UL 94-V0.
Advantages
• High isolation between primary and
secondary circuits
• Compact case
• Cost-effective solution
• Easy installation
Applications
• Automation and Supervision
Current measurement for process
regulation by distributed PLCs or
remote control (e.g. SCADA
software)
• Security and Condition Monitoring
Load monitoring for protection
systems and predictive
maintenance (e.g. conveyers,
pumps or HVAC motors)
• Energy management
Convenient connection to power
consumption sub-meters
Application domain
• Energy and Automation
Note: 1) Max. Load Resistance vs. Supply Voltage
AC Current transducer AT-B420L
Split-core transducer for the electronic measurement of AC waveform
currents, with galvanic isolation between the primary circuit (power)
and the secondary circuit (measurement). 4-20 mA current output
proportional to the RMS value of the primary current.
Electrical data
Primary nominal Output current Type
current rms
IPN (A.t.Rms) IOUT (mA)
5 4-20 AT 5 B420L
10 4-20 AT 10 B420L
20 4-20 AT 20 B420L
50 4-20 AT 50 B420L
100 4-20 AT 100 B420L
150 4-20 AT 150 B420L
RL Load resistance, with VC = + 24 V DC 1) < 600 W
VC Supply voltage (loop-powered) + 20 .. 30 V DC
ISL Output current limitation < 30 mA
ÎP Overload capability - continuous 120 % of IPN
- 1 min 150 % of IPN
Performance data
X Accuracy @ IPN, TA = 25°C (excluding offset) < ± 1.5 % of IPN
eL Linearity error < ± 0.5 % of IPN
IOE Electrical offset current, TA = 25°C 4 ± 0.2 mA
tr Response time to 90% of IPN step < 100 ms
BW Frequency bandwidth 50/60 Hz
General data
TA Ambient operating temperature - 20 .. + 60 °C
TS Ambient storage temperature - 20 .. + 85 °C
m Mass 90 g
IPxx Protection degree IP40
Note: 1) Max. Load Resistance vs. Supply Voltage
15
20
25
30
35
400 500 600 700 800 900 1000
Max. Load Resistance (Ohm)
Supply Voltage (V)
Electrical data
Primary nominal current rms Output current Type
IPN (A.t.Rms) IOUT (mA)
54-20 AT 5 B420L
10 4-20 AT 10 B420L
20 4-20 AT 20 B420L
50 4-20 AT 50 B420L
100 4-20 AT 100 B420L
150 4-20 AT 150 B420L
R LLoad resistance, with VC = + 24 V DC 1) < 600 W
VCSupply voltage (loop-powered) + 20 .. 30 V DC
ISL Output current limitation < 30 mA
ÎPOverload capability - continuous 120 % of IPN
- 1 min 150 % of IPN
Performance data
XAccuracy @ IPN, TA = 25°C (excluding offset) < ± 2 % of IPN
εLLinearity error < ± 0.5 %
IOE Electrical offset current, TA = 25°C 4 ± 0.2 mA
t rResponse time to 90% of IP step < 100 m s
BW Frequency bandwidth 50/60 Hz
General data
TAAmbient operating temperature - 20 .. + 60 °C
TSAmbient storage temperature - 20 .. + 85 °C
mMass 90 g
IPxx Protection degree IP40
AC Current transducer AT-B420L
Split-core transducer for the electronic measurement of AC waveform
currents, with galvanic isolation between the primary circuit (power) and the
secondary circuit (measurement). 4-20mA current output proportional to
the RMS value of the primary current.
IPN = 5 .. 150 A
071115/4 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
Features
•RMS output
•Loop-powered 4-20mA current output
•Split-core type
•Ø 16 mm sensing aperture for non-
contact measurement
•Terminal output
•Isolated plastic case recognized
according to UL 94-V0.
Advantages
• High isolation between primary and
secondary circuits
• Compact case
• Cost-effective solution
• Easy installation
Applications
• Automation and Supervision
Current measurement for process
regulation by distributed PLCs or
remote control (e.g. SCADA
software)
• Security and Condition Monitoring
Load monitoring for protection
systems and predictive
maintenance (e.g. conveyers,
pumps or HVAC motors)
• Energy management
Convenient connection to power
consumption sub-meters
Application domain
• Energy and Automation
Note: 1) Max. Load Resistance vs. Supply Voltage
090609/6 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
Page 2/3
Current Transducer AT-B420L
Isolation characteristics
Vb Rated isolation voltage rms 2) 300 V
with IEC 61010-1 standards and following conditions:
- Reinforced isolation
- Over voltage category CAT III
- Pollution degree PD2
- Heterogeneous eld
Vd Rms voltage for AC isolation test 3), 50Hz, 1min. 3.5 kV
dCp Creepage distance 6 mm
dCl Clearance distance 6 mm
CTI Comparative tracking index (Group I) 600
Notes: 2) If insulated cable is used for the primary circuit, the voltage category could
be improved according to the primary cable insulation category (please
refer to the cable manufacturer’s indications)
3) between primary (completely lling the hole) 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 specications.
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 qualied personnel that have
rceived 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
rquirements 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.
090609/6 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice. www.lem.com
Page 3/3
Dimensions AT-B420L (in mm. 1 mm = 0.0394 inch)
Bottom view
Top view
Back view
Mechanical characteristics
General tolerance ± 1 mm ●
Primary aperture Ø 16 mm ●
Fastening Cable tie ●
Connections
Wires up to 2 mm Ø ●
Remarks
ATTENTION: contact areas (air gap) must be kept clean ●
(particle free) to ensure proper performance
Dimensions AT-B420L (in mm. 1 mm = 0.0394 inch)
Mechanical characteristics
•General tolerance ± 1 mm
•Primary aperture ∅ 16 mm
•Fastening Cable tie
071115/4 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
Remark
•ATTENTION: contact areas (air gap) must be kept clean
(particle free) to ensure proper performance
Connections
•Wires up to 2 mm ∅
44
2.5
18
1.5
23.5
31.5
51
40.5
28.5
16
18
22
K
L
+
16
+
(OUT)(+V)
2-M3 terminal with cover
N.P
Ip
Is
OUT
+24VDC
GND
K
L
(+)
(-)
Ip
Is
OUT
+24VDC
GND
K
L
(+)
(-)
(+)
(-)
24 VDC Power
(Controller, meter etc)
(-)
(+)
(-)(+)
(+V)(OUT)
Dimensions AT-B420L (in mm. 1 mm = 0.0394 inch)
Mechanical characteristics
•General tolerance ± 1 mm
•Primary aperture ∅ 16 mm
•Fastening Cable tie
071115/4 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
Remark
•ATTENTION: contact areas (air gap) must be kept clean
(particle free) to ensure proper performance
Connections
•Wires up to 2 mm ∅
44
2.5
18
1.5
23.5
31.5
51
40.5
28.5
16
18
22
K
L
+
16
+
(OUT)(+V)
2-M3 terminal with cover
N.P
Ip
Is
OUT
+24VDC
GND
K
L
(+)
(-)
Ip
Is
OUT
+24VDC
GND
K
L
(+)
(-)
(+)
(-)
24 VDC Power
(Controller, meter etc)
Load
(-)
(+)
(-)(+)
(+V) (OUT)