Current Transducer LAH 125-P

For the electronic measurement of currents: DC, AC, pulsed...,with galvanic separation between the primary circuit and the secondarycircuit.

Electrical dataFeatures

IP N Primary nominal RMS current						125		A
IP M Primary current, measuring range				0 ... ±200
A
RM Measuring resistance @ 						TA = 70 °C
TA = 85 °C							RM minRM max RM minRM max
with ±12 V@ ±125 Amax
0491448 Ω		@ ±200 Amax
0141415 Ωwith ±15 V@ ±125 Amax
22 722970 Ω		
@ ±200 Amax
22 282929 Ω
IS N Secondary nominal RMS current						125		mA
NP/NS Turns ratio							1 : 1000
UC Supply voltage (±5 %)							±12 ... 15VICCurrent consumption							19 (@ ±15 V) + ISmAAccuracy - Dynamic performance data
εtot Total error @ IP N, TA = 25 °C						±0.41		εLLinearity error							< 0.15										TypMax
IO
Offset current referred to primary @ IP = 0, TA = 25 °C		±200
IO
Offset current referred to secondary @ IP = 0, TA = 25 °C		±0.20
IO M Magnetic offset current 1) @ IP = 0, referred to secondaryand specified RM, after an overload of 3 × IP N			 ±0.20
IO T Temperature variation of IO, referred to secondary			‒25 °C ... +70 °C ±0.22 ±0.65		
‒40 °C ... +85 °C ±0.30 ±0.95
tD 10 Delay time to 10 % of the final output value for IP N step < 500		
tD 90 Delay time to 90 % of the final output value for IP N step 2) < 1000		
BW Frequency bandwidth (‒3 dB) @ IP N 				DC ... 100%%mA
mA
mA
mA
mA
nsnskHz

General data
TA Ambient operating temperature						TA st Ambient storage temperature						RS Resistance of secondary winding 		@ TA = 70 °C				@ TA = 85 °CmMass							Standard							Notes:1)

IP N = 125 A‒40 ... +85‒40 ... +90
34		3530
EN 50178: 1997°C°CΩΩg● Closed loop (compensated)current transducer using the Halleffect● Printed circuit board mounting.

Advantages● Excellent accuracy● Very good linearity● Low temperature drift● Optimized delay time
● Wide frequency bandwidth● No insertion losses● High immunity to externalinterference● Current overload capability.

Applications● AC variable speed drives andservo motor drives● Static converters for DC motordrives● Battery supplied applications● Uninterruptible Power Supplies(UPS)● Switched Mode Power Supplies(SMPS)● Power supplies for welding
applications.

Application Domain● Industrial.

The result of the coercive field of the magnetic circuit
For a di/dt = 100 A/µs.

2)		

N° 97.34.36.000.0
18April2023/Version 10Page 1/4
LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

Current Transducer LAH 125-P
Insulation coordination
RMS voltage for AC insulation test, 50 Hz, 1 min			
Impulse withstand voltage 1.2/50 µs						

512kV
kV

Partial discharge RMS test voltage (qm< 10 pC)			
Ut									dCp Creepage distance 1)								dCI Clearance 1)								CTI Comparative tracking index (group IIIa)				

>2
Min
14.25
14.25
175kV

UdUNimmmm

Note: 1) On PCB with soldering pattern UTEC93-703.

Applications examples
According to EN 50178 and IEC 61010-1 standards and following conditions:● Over voltage category OV 3
● Pollution degree PD2● Non-uniform field.
EN 50178

IEC 61010-1

Rated insulation voltage

Nominal voltage

Basic insulation

1250 V1000 V

Reinforced insulation

630 V

600 V

dCp, dCI, UNi

SafetyThis transducer must be used in limited-energy secondary circuits according toIEC 61010-1.

This transducer must be used in electric/electronic equipment with respect toapplicable standards and safety requirements in accordance with the manufacturer’soperating instructions.

Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury
and/or cause serious damage.
This transducer is a build-in device, whose conducting parts must be inaccessible
after installation. A protective housing or additional shield could be used.
Main supply must be able to be disconnected. Main supply must be able to bedisconnected.

N° 97.34.36.000.0
18April2023/Version 10Page 2/4
LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

UL 508: Rating and assumptions of certification
File # E189713 Vol:2 Sec:1

Standards
USR indicated investigation to the Standard for Industrial Control Equipment UL 508,Seventeenth Edition.
CNR indicated investigation to the Canadian Standard for Industrial ControlEquipment CSA C22.2 No. 14-10, Eleventh Edition.

Ratings
Parameter

Unit

Standard Value

Derating ValuePrimary involved potential

V AC/DC

600

600

Primary current

A AC/DC12586

Secondary supply voltage

V DC

0 ... ±15 V

0 ... ±13.5 V

Output signalmA

0 ... 125

0 ... 86

Max surrounding air temperature°C8595

Use

For use only in complete equipment where the acceptability of the combination isdetermined by Underwriters Laboratories Inc.

Conditions of acceptability
When installed in the end-use equipment, consideration shall be given to the following:
1. These devices must be mounted in a suitable end-use enclosure.
2. The terminals have not been evaluated for field wiring.
3. The LAH Series is intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI of100).
4. The LAH Series shall be used in a pollution degree 2 environment.
5. LAH Series shall be mounted on the load side of line filters.
6. Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer,
optical isolator, limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit(other than through the grounding means).
7. LAH Series: Based on results of temperature tests, in the end use application, a maximum of 100 °C cannot be exceededat soldering point between primary coil pin and soldering point or on the primary bus bar (corrected to the appropriate
evaluated max. surrounding air).

Marking
Only those products bearing the UL or UR mark should be considered to be listed or recognized and covered under UL's Followup services. Always look for the mark on the product.

Page 3/4
18April2023/Version 10

LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

Dimensions LAH 125-P (in mm)

dCp dCI
dCI

dCp

14.25

14.25

Connection
IP

IS

RM+UC-UC

Mechanical characteristics● General tolerance		● Fastening & connection of primary
Recommended PCB hole		● Fastening & connection of secondary
Recommended PCB hole		Remarks±0.2 mm
8 pins 1.4 × 1 mm
2 mm
3 pins 0.7 × 0.6 mm
1.2 mm● The temperature of the primary circuit board traceconnected to the primrary pins of the transducer should
not exceed 100 °C during operation.
● IS is positive when IP flows in the direction of the arrow.
● This is a standard model. For different versions (supplyvoltages, turns ratios, unidirectional measurements...),
please contact us.

Page 4/4
18April2023/Version 10

LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com