LEM LTSR 25-NP Closed Loop AC/DC Hall Effect Sensor
Features
Closed loop current transducer
Voltage output
4.3kV Isolation
Frequency bandwidth 200kHz
Single supply + 5 V
Galvanic isolation between primary and secondary
Low power consumption
Compact design for PCB mounting
Vref IN Vref OUT
Multirange through PCB rounting
Advantages
LXSR footprint compatible
Excellent accuracy
Zero insertion losses
Very good linearity
Very good dv/dt immunity
High immunity to external intereference
Current overload capability
Optimised response time
Applications
AC variable speed and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications
Standards
EN 50178: 1997
UL 508: 2013
IEC 61010-1(safety)
Application Domain
Industrial
Specification
LEM Part Number
LTSR 25-NP
Technology
Closed Loop Multirange Hall Effect
Aperture
ø3.2mm
ROHS
Yes
Supply Voltage
5 VDC
Load Current (RMS + DC)
25 Amp
Measurement Range
+/-80 Amp
Output
2.5 Vref
Isolation
3 kV
Bandwidth
DC-200 kHz
Mounting Style
PCB Mount
Operating Temperature Range
-40°C / 85°C
Accuracy
0.2%
Termination Style
PCB
Unit Weight
9g
Factory Packaging
3
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
Alternatives
LXSR 25-NPS
LEM LES 6-NP, C/L Multi Range Hall Effect Current Sensor, 6 Amp, 2.5V ref in ref Out, PCB Mount, X = 2.25%, 4.3kV Isolation
Features
Closed loop current transducer
Voltage output
4.3kV Isolation
Frequency bandwidth 300kHz
Single supply + 5 V
Galvanic isolation between primary and secondary
Low power consumption
Compact design for PCB mounting
Vref IN Vref OUT
Multirange through PCB routing
Advantages
LTS footprint compatible
Zero insertion losses
Very good linearity
Very good dv/dt immunity
High immunity to external interference
Current overload capability
Optimised response time
Applications
AC variable speed and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications
Solar inverters
Standards
IEC 61800-1: 1997
IEC 61800-2: 2015
IEC 61800-3: 2004
IEC 61800-5-1: 2007
IEC 62109-1: 2010
IEC 62477-1: 2012
UL 508:2013.
Application Domain
Industrial
Specification
LEM Part Number
LES 6-NP
Technology
Closed Loop Multirange Hall Effect
Aperture
No Aperture
ROHS
Yes
Supply Voltage
5 VDC
Load Current (RMS + DC)
6 Amp
Measurement Range
+/-20 Amp
Output
2.5 Vref
Isolation
4.3 kV
Bandwidth
DC-300 kHz
Mounting Style
PCB Mount
Operating Temperature Range
-40°C / 105°C
Accuracy
2.25%
Termination Style
PCB
Unit Weight
10g
Factory Packaging
25
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
Alternatives
LTS 6-NP
LEM HO 120-NP-0100 Series Open Loop AC/DC Hall Effect Sensor
Features
Open loop multi-range current transducer
Voltage output
Single power supply +5 V
Overcurrent detect 2.93 × IP N (peak value)
Galvanic separation between primary and secondary circuit
Low power consumption
Factory calibrated
Compact design for PCB mounting
Factory calibrated
Repositionable mounting foot
Dedicated parameter settings available on request
Advantages
Low offset drift
Over-drivable Vref
Creepage / clearance > 8 mm
Fast response
Applications
AC variable speed and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications
Combiner box
Solar inverter on DC side of the inverter (MPPT).
Standards
IEC 61800-1: 1997
IEC 61800-2: 2015
IEC 61800-3: 2004
IEC 61800-5-1: 2007
IEC 62109-1: 2010
UL 508: 2013.
Application Domain
Industrial.
Specification
LEM Part Number
HO 120-NP-0100
Technology
Open Loop Hall Effect
Aperture
N/A
ROHS
Yes
Supply Voltage
5 VDC
Load Current (RMS + DC)
120 Amp
Measurement Range
+/-300 Amp
Output
2.5 Vref
Isolation
4.3 kV
Bandwidth
DC-350 kHz
Mounting Style
Panel Mount
Operating Temperature Range
-40°C / 105°C
Accuracy
1.5%
Termination Style
PCB Through Hole
Unit Weight
32g
Factory Pack Quantity
25
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
LEM CD 100-S/SP5, O/L Hall Effect Current Sensor, 2 x 1000 Amp, +/-5V Output
Features
Bandwidth DC to 5kHz
Closed loop transducer using Hall effect (Compensated)
Compact and versatile
Panel mounting-Horizontal or Vertical
Insulated plastic case recognized according to UL 94-V0
Advantages
Very good linearity
Very good accuracy
Low temperature drift
Wide frequency bandwidth
Very low insertion losses
High immunity to external interference
Current overload capability
Low power consumption
Applications
Single or 3 Phase Inverter
Propulsion and Breaking Chopper
Propulsion Converter
Auxiliary Converter
Railway Security System
Specification
LEM Part Number
CD100-S/SP5
Technology
Closed Loop Hall Effect
Aperture
ø40mm
ROHS
Yes
Supply Voltage
+/-15 VDC Bipolar, Isolated
Load Current (RMS + DC)
2 x1000 Amp
Output
+/-5 V
Isolation
6 kV
Bandwidth
DC-5 kHz
Mounting Style
Panel Mount
Operating Temperature Range
-10°C / 80°C
Accuracy
2.5%
Unit Weight
1kg
Factory Pack Quantity
10
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
FR28 2.5A-4A, 2.5 - 4 Amp Thermal Overload Relay for FGC1-K Series Mini Contactors
Features
Snap on
2 x NO, 2 x NC 6 Amp Contacts
150 grams
Datasheet
Thermal Relays Datasheet
LEM AHR 800 B10, Hall Effect Current Sensor, 800Amp, True RMS 0-10V output, 104 x 40mm aperture
Compact and versatile transducers for high AC and DC currents from 500 to 2000A True RMS with signal conditioning. Choice of output types: 4-20 mA, 0-5 V or 0-10 V, Bandwidth: DC 20..6000 Hz
Features
Split Core
VFD and SCR waveforms current measurement
True RMS output
0-10V voltage output
Busbar mounting
Eliminates insertion loss
Isolated plastic case recognised according to UL94-V0
Advantages
Large aperture for cable or busbar up to 104 x 40mm
High isolation between primary and secondary circuits
Easy installation
Applications
-AC Power Supplies or Motors
True RMS sensing - the most accurate way to monitor power supply or input power
-VFD Controlled Loads
VFD output indicates how the motor and attached load are operating
-SCR Controlled Loads
Accurate measurement of phase angle fired or burst fired(time proportional) SCR's and switch mode rectifiers. Current measurement gives faster response than temperature measurement.
-Renewable Energy Installations or Backup Batteries
Continuous condition monitoring allowing automatic failure detection and prediction
-Application Domain
Energy and Automation
Specification
LEM Part Number
AHR 800 B10
Technology
Open Loop Hall Effect
ROHS
Yes
Supply Voltage
20 - 50V
Nominal Current (RMS + DC)
800 Amp
Maximum Measurement Current (Peak)
2500 Amp
Output
0-10V
Isolation
5.8kV (AC, 50Hz, 1 min)
Bandwidth
20-6000Hz
Mounting Style
Panel Mount
Operating Temperature Range
-40°C / 70°C
Accuracy
1%
Termination Style
SFKC 2.5/4-ST-5.08-RF(Phoenix Contact)
Unit Weight
650g
Factory Pack Qty
6
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
2026 LEM Application Guide
Trent I²t Semiconductor Fuse, NBR-FWP-600A 700V AC/DC, Semiconductor Fuse, 600 Amp, 700VAC/DC, Round Barrel 7.09 x 2.0 x 2.5 Inches. Clearing I2t 250kA, Breaking Capacity 200kAand Microswitch
Features
Square Body DIN 43 653
Wide Range of I²t
Ratings up to 2000 Amp
Busbar or Fuse Holder Mounted
IEC Standard 60269.1 AND 4
690 V Voltage Rating complying with IEC 33
Fuse Blown Indicator and Microswitch
Applications
Protection of High Powered Semiconductors according to I²t
Short Circuit Protection
DC or AC Motor I²t Protection
Battery Fuse
Specification
Trent Part Number
NBR-FWP-600A 700V AC/DC
Fuse Type
I²t AR Class
Nominal Voltage
700VAC @ 50Hz
I²t Rating (660V)
250000A²/s
Nominal Current (RMS + DC)
600 Amp
Tested Breaking Capacity
200kA @ 700VAC/DC
Dimensions
138 x 61 x 50mm
Hole Centers
108mm +
Mounting Style
Busbar or Panel Mount with Standoff
Operating Temperature Range
-40°C / 125°C
Watts Dissipation
75W
Termination Style
M10
Unit Weight
350g
Factory Pack Qty
10
Datasheet
Product Datasheet
LEM AHR 500 B420, Hall Effect Current Transducer, 500A, 4-20mA True RMS output, 20-50VDC supply
Compact and versatile transducers for high AC and DC currents from 500 to 2000A True RMS with signal conditioning. Choice of output types: 4-20 mA, 0-5 V or 0-10 V, Bandwidth: DC 20..6000 Hz
Features
Split Core
VFD and SCR waveforms current measurement
True RMS output
4-20mA current output
Busbar mounting
Eliminates insertion loss
Isolated plastic case recognised according to UL94-V0
Advantages
Large aperture for cable or busbar up to 104 x 40mm
High isolation between primary and secondary circuits
Easy installation
Applications
-AC Power Supplies or Motors
True RMS sensing - the most accurate way to monitor power supply or input power
-VFD Controlled Loads
VFD output indicates how the motor and attached load are operating
-SCR Controlled Loads
Accurate measurement of phase angle fired or burst fired(time proportional) SCR's and switch mode rectifiers. Current measurement gives faster response than temperature measurement.
-Renewable Energy Installations or Backup Batteries
Continuous condition monitoring allowing automatic failure detection and prediction
-Application Domain
Energy and Automation
Specification
LEM Part Number
AHR 1500 B420
Technology
Open Loop Hall Effect
ROHS
Yes
Supply Voltage
20 - 50V
Nominal Current (RMS + DC)
500 Amp
Maximum Measurement Current (Peak)
2000 Amp
Output
4-20mA
Isolation
5.8kV (AC, 50Hz, 1 min)
Bandwidth
20-6000Hz
Mounting Style
Panel Mount
Operating Temperature Range
-40°C / 70°C
Accuracy
1%
Termination Style
SFKC 2.5/4-ST-5.08-RF(Phoenix Contact)
Unit Weight
650g
Factory Pack Qty
6
Datasheet
Product Datasheet
Application Notes
LEM Applications Manual 3rd Edition
2026 LEM Application Guide
LEM HTFS 800-P, Open Loop Hall Effect Current Sensor, 800 Amp, 5VDC Supply, PCB Mount, X = 1%
Features
Bandwidth DC to 240kHz
Open loop transducer using Hall effect
Compact and versatile
Uinique PCB Mounting
Insulated plastic case recognized according to UL 94-V0
Advantages
Fixed offset
Very good linearity
Very good accuracy
Low temperature drift
Wide frequency bandwidth
Very low insertion losses
High immunity to external interference
Current overload capability
Low power consumption
Applications
AC variable speed drives and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications.
Specification
LEM Part Number
HTFS 800-P
Technology
Open Loop Hall Effect
Aperture
ø 22mm
ROHS
Yes
Supply Voltage
5 VDC Bipolar, Isolated
Load Current (RMS + DC)
800 Amp
Measurement Range
+/-1200 Amp
Output
1.65Vref
Isolation
2.5 kV
Bandwidth
DC-240 kHz
Mounting Style
PCB Mount (fixation with 4 pins 1mm)
Operating Temperature Range
-40°C / 105°C
Accuracy
1%
Termination Style
PCB
Unit Weight
60g
Factory Pack Quantity
10
Datasheet
Product Datasheet