electronic current transducer LEM LA55-P featuring galvanic isolation and low temperature drift for industry

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Product Description

Product Overview

The LEM LA 55-P is a closed-loop current transducer utilizing Hall effect technology for the electronic measurement of DC, AC, and pulsed currents. It offers galvanic isolation between the primary and secondary circuits and is designed for printed circuit board mounting. Key advantages include excellent accuracy, very good linearity, low temperature drift, optimized response time, and a wide frequency bandwidth, making it suitable for various industrial applications.

Product Attributes

Brand: LEM
Certifications: UL 94-V0, EN 50178, IEC 61010-1

Technical Specifications

Parameter	Value	Notes
Product Name	LA 55-P	Current Transducer
Primary Nominal Current (IPN)	50 A (rms)
Primary Current Measuring Range (IPM)	0 .. 70 A
Secondary Nominal Current (ISN)	50 mA (rms)
Conversion Ratio (KN)	1 : 1000
Supply Voltage (VC)	12 .. 15 V ( 5 %)
Current Consumption (IC)	10 mA (@ 15 V) + IS
Accuracy (@ IPN, TA = 25C, 15 V)	0.65 %
Accuracy - Dynamic Performance (@ 12..15 V)	0.90 %
Linearity Error (L)		Typ
Offset Current (IO) (@ IP = 0, TA = 25C)	0.2 mA
Magnetic Offset Current (IOM) (@ IP = 0, after 3x IPN overload)	0.3 mA	3)
Temperature Variation of IO	0.1 .. 0.6 mA (-25C to +85C) / 0.2 .. 1.0 mA (-40C to -25C)
Reaction Time (to 10% of IPN step)
Response Time (to 90% of IPN step)
di/dt	> 200 A/s	Accurately followed
Frequency Bandwidth (- 1 dB)	DC .. 200 kHz
Ambient Operating Temperature (TA)	- 40 .. + 85 C
Ambient Storage Temperature (TS)	- 40 .. + 90 C
Secondary Coil Resistance (RS) (@ TA = 70C / 85C)	80 / 85
Mass	18 g
Isolation Test Voltage (Vd)	2.5 kV (rms)	50 Hz, 1 min
Impulse Withstand Voltage (Vw)	5.7 kV	1.2/50 s
Creepage Distance (dCp)	5 mm
Clearance Distance (dCI)	5 mm
Comparative Tracking Index (CTI)	175	Group IIIa
Rated Isolation Voltage (Single/Reinforced)	500 V / 250 V	According to EN 50178 / IEC 61010-1
Primary Through-hole Dimensions	12.7 x 7 mm
Secondary Connection	3 pins (0.63 x 0.56 mm)
Recommended PCB Hole	0.9 mm
General Tolerance	0.2 mm