LEM LA55 P SP50 sensor offering accurate DC AC and pulsed current measurement with insulated housing

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Product Description

Product Overview

The LA 55-P/SP50 is a closed-loop Hall effect current sensor designed for measuring DC, AC, and pulsed currents. It offers excellent accuracy, good linearity, low temperature drift, optimal response time, and wide bandwidth with no insertion loss and strong immunity to interference. The sensor features an insulated housing compliant with UL 94-V0 and is suitable for direct mounting on printed circuit boards.

Product Attributes

Brand: LEM
Model: LA 55-P/SP50
Origin: Beijing, China
Certifications: UL 94-V0, prEN 50178
Housing Material: Insulated

Technical Specifications

Parameter	Description	Value	Unit	Notes
Primary Current	Rated RMS Primary Current (IPN)	50	A
	Primary Current Measuring Range (IP)	0 .. 70	A
	Overload Current (3 x IPN)	0.3	mA	IHC (Residual current after overload)
	Follow-up Accuracy (di/dt)	> 200	A/s
Secondary Current	Rated RMS Secondary Current (ISN)	50	mA
	Conversion Ratio (KN)	1:1000
	Secondary Coil Resistance (RS) @ TA = 70C	80
	Secondary Coil Resistance (RS) @ TA = 85C	85
Power Supply	Supply Voltage (VC)	12 .. 15 ( 5 %)	V
	Current Consumption (IC) @ 15 V	10 + IS	mA
	RMS Voltage for AC Insulation Test (Vd), 50 Hz, 1 min	2.5	kV
	Measurement Resistance (RM) @ 12 V @ 50 A max	100		@ TA = 70C
	Measurement Resistance (RM) @ 12 V @ 50 A max	95		@ TA = 85C
	Measurement Resistance (RM) @ 15 V @ 50 A max	160		@ TA = 70C
Accuracy	Accuracy @ TA = 25C, @ 15 V ( 5 %) (X)	0.5	% @ IPN
	Linearity ( L)	< 0.15	%	Typ
	Zero Offset Current (IO) @ TA = 25C	0.2	mA
	Temperature Drift of Offset Current (IOT) 0C .. 70C	0.1 .. 0.5	mA
	Temperature Drift of Offset Current (IOT) - 25C.. + 85C	0.1 .. 0.6	mA
Dynamic Parameters	Response Time (tra) @ 10 % of IP max	< 500	ns
Dynamic Parameters	Response Time (tr) @ 90 % of IP max	< 1	s
Frequency Bandwidth	(-1dB)	DC .. 200	kHz
Frequency Bandwidth	di/dt (Follow-up Accuracy)	> 200	A/s
Environmental	Ambient Operating Temperature (TA)	-25 .. +85	C
Environmental	Ambient Storage Temperature (TS)	- 40 .. + 90	C
Mechanical	Mass (G)	18	g

Applications

Variable speed AC drives, servo motors
Static converters for DC motor traction
Battery supplies
Uninterruptible Power Supplies (UPS)
Switch Mode Power Supplies (SMPS)
Welding power supplies
Industrial applications

Advantages

Excellent accuracy
Good linearity
Low temperature drift
Optimal response time
Wide bandwidth
No insertion loss
Strong immunity to interference
Current overload capability

Notes

Positive IS is when current flows in the direction of the arrow on IP.
Primary conductor temperature should not exceed 90C.
Dynamic performance (di/dt and response time) is optimal when the busbar completely fills the primary aperture.
This module is a standard sensor. For different applications (supply voltage, turns ratio, unidirectional measurement), please contact us.
For optimal magnetic coupling, the primary return coil must be located on the top surface of the device.