current measurement device LEM LA125-P with low temperature drift and excellent linearity performance

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Product Description

Product Overview

The LEM LA 125-P/SP4 is a closed-loop Hall effect current transducer designed for the electronic measurement of DC, AC, and pulsed currents with galvanic separation between primary and secondary circuits. It offers excellent accuracy, linearity, low temperature drift, and a wide frequency bandwidth, making it suitable for demanding applications in AC variable speed drives, servo motor drives, static converters, UPS, SMPS, and welding power supplies, particularly in the traction domain.

Product Attributes

Brand: LEM
Certifications: UL 94-V0, EN 50155:1995
Material: Insulating plastic case

Technical Specifications

Specification	Value	Notes
Primary Nominal Current (IPN)	125 A (rms)
Primary Current Measuring Range (IPM)	0 .. 300 A
Secondary Nominal Current (ISN)	62.5 mA (rms)
Conversion Ratio (KN)	1 : 2000
Supply Voltage (UC)	12 .. 15 V ( 5 %)
Current Consumption (IC)	16 mA (@ 15 V) + IS
Accuracy @ IPN, TA = 25 C	0.60 % (@ 15 V) / 0.80 % (@ 12 .. 15 V)
Linearity Error (L)		Typ
Offset Current (IO) @ IP = 0, TA = 25 C	0.20 mA
Magnetic Offset Current (IOM)	0.25 mA	After 3 x IPN overload
Temperature Variation of IO	0.20 .. 0.50 mA (-25C to +85C) / 0.30 .. 0.80 mA (-40C to -25C)
Reaction Time (tra)
Step Response Time (tr) to 90%
di/dt Accurately Followed	> 200 A/s
Frequency Bandwidth (BW) (-1 dB)	DC .. 100 kHz
Ambient Operating Temperature (TA)	- 40 .. + 85 C
Ambient Storage Temperature (TS)	- 45 .. + 100 C
Secondary Coil Resistance (RS)	76 (@ TA = 70 C) / 80 (@ TA = 85 C)
Mass	55 g
Isolation Test Voltage (Ud)	4.5 kV rms / 8.4 kV (1) rms	50 Hz, 1 min
Creepage Distance (dCp)	8.8 mm
Clearance (dCI)	8.8 mm
Comparative Tracking Index (CTI)	175	Group IIIa
Primary Through-hole	17 4.5 mm or 13 11 mm
Secondary Connection	4 pins 0.63 x 0.56 mm	Recommended PCB hole 0.9 mm
Supplementary Fastening	2 holes 1.75 mm	Recommended PCB hole 2.4 mm