Current Transducer LAH 50-P

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

IP N = 50 A

Electrical data
IP N Primary nominal RMS current		
IP M Primary current, measuring range 1)
RM
Measuring resistance @		with ±12 V@ IP N [±A DC]		
@ IP N [A RMS] 2)with ±15 V@ IP N [±A DC]		
@ IP N [A RMS] 2)
IS N Secondary nominal RMS current		
NP/NS Turns ratio			UC Supply voltage (±5 %)			
ICCurrent consumption			50		
A0 … ±110ATA = 70 °C TA = 85 °CRM min RM max RM min RM max
02210214 Ω01150108 Ω03350327 Ω01950188 Ω25		mA
1 : 2000±12 … 15V10 (@ ±15 V) + ISmAAccuracy - Dynamic performance data
εtot Total error 3) @ IP N, TA = 25 °C		±0.25		
εLLinearity error			< 0.15						TypMax
IO
Offset current @ IP = 0, TA = 25 °C			±0.15
IO M Magnetic offset current @ IP = 0
and specified RM, after an overload of 5 × IP N
±0.10 ±0.15
IO T Temperature variation of IO 		0 °C … +70 °C ±0.10 ±0.30−25 °C … +85 °C ±0.10 ±0.40
tD 10 Delay time to 10 % of the final output value for IP N step 4) < 200		tD 90 Delay time to 90 % of the final output value for IP N step 4) < 500		
BW Frequency bandwidth (‒1 dB)		
DC ... 200

%%mA
mA
mA
mA
nsns
kHzGeneral data
TA Ambient operating temperature		TA st Ambient storage temperature			
RS Resistance of secondary winding @ TA = 70 °C@ TA = 85 °CmMass			Standards			
Notes: 1) During 10 s, with RM ≤ 71 Ω (UC = ±15 V)
2)
Sinusoidal wave 50 Hz
3)
Without IO & IO M
4)With a di/dt of 200 A/µs.

‒25 ... +85‒40 ... +90
115		
121
22EN 50178: 1997°C°CΩΩ
gFeatures● Closed loop (compensated)current transducer using the Halleffect● Printed circuit board mounting● Insulating plastic case recognizedaccording to UL 94-V0.

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.

N° 97.34.25.000.0
27March2023/Version 14

LEM reserves the right to carry out modifications on its transducers,in order to improve them, without prior notice

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

Current Transducer LAH 50-P
Insulation coordination
RMS voltage for AC insulation test, 50 Hz, 1 min		
Impulse withstand voltage 1.2/50 µs		512kVkV

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

>2
Min
11.75
11.75
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 fieldEN 50178

IEC 61010-1

Rated insulation voltageNominal voltage

Basic insulation

1000 V

1000 V

Reinforced insulation

500 V

500 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 injuryand/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.

27March2023/Version 14

LEM reserves the right to carry out modifications on its transducers,in order to improve them, without prior notice

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

Dimensions LAH 50-P (in mm)

dCI

dCp

11.75

11.75

Connection
ISIP

RM

0V+UC−UC

Primary current

Number ofprimary turns

NominalMaximum

150110IP N [A]

IP [A]

Nominal output
current

IS N [mA]

NP/NS25

1 : 2000

27March2023/Version 14

Primary
resistancePrimary insertion
inductance

0.120.008

RP [mΩ]LP [µH]

Remarks

Mechanical characteristics● General tolerance		● Fastening & connection of primary
Recommended PCB hole		● Fastening & connection of secondary
Recommended PCB hole		

Turns
ratio

±0.2 mm
6 pins 1.4 × 1 mm
2 mm
3 pins 0.7 × 0.6 mm
1.2 mm● IS is positive when IP flows from terminals IN to terminals
OUT.
● The jumper temperature and PCB should not exceed
100 °C.
● This is a standard model. For different versions (supplyvoltages, turns ratios, unidirectionnal measurements...),
please contact us.

LEM reserves the right to carry out modifications on its transducers,in order to improve them, without prior notice

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