High accuracy isolated current sensor LEM LT208-S7 designed for DC AC and pulse current applications

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Product Description

Product Overview

The LEM LT 208-S7 is an isolated current sensor designed for measuring DC, AC, and pulse currents. It offers excellent accuracy, linearity, low temperature drift, and fast response times, making it suitable for a wide range of industrial applications including variable speed drives, servo motors, and power supplies.

Product Attributes

Brand: LEM
Model: LT 208-S7
Certifications: EN 50178, UL 94-V0 (insulation housing)
Origin: China (implied by Shanghai Jiaren mention)

Technical Specifications

Parameter	Value	Unit	Notes
Primary Rated RMS Current (IPN)	200	A
Primary Current Measuring Range (IPM)	0 .. 300	A
Secondary Rated RMS Current (ISN)	100	mA
Conversion Ratio (KN)	1 : 2000
Supply Voltage (VC)	12 .. 15	V	( 5 %)
Current Consumption (IC)	28 (@ 12V) + IS	mA
Total Accuracy @ IPN, TA = 25C (XG)	0.5	%
Linearity (L)	< 0.1	%	Typ
Zero Offset Voltage @ IP = 0, TA = 25C (IO)	0.20	mA
Magnetic Offset Current (IOM)	0.20	mA	@ IP = 0, overload through 3 x IPN
Temperature Drift of IO (IOT)	0.20 .. 0.64	mA	(- 10C .. + 70C)
Response Time to 10% of IPN (tra)	< 500	ns
Response Time to 90% of IPN (tr)	< 1	s	2)
di/dt Following Accuracy	> 100	A/s
Bandwidth (- 3 dB) (BW)	DC .. 100	kHz
Ambient Operating Temperature (TA)	- 10 .. + 70	C
Ambient Storage Temperature (TS)	- 25 .. + 80	C
Secondary Coil Resistance @ TA = 70C (RS)	21
Mass (m)	79	g
AC Isolation Test Voltage (Vd)	3.52	kV	50 Hz, 1 min, primary-secondary
Impulse Withstand Voltage (Vw)	6.5	kV	1.2/50 s
Creepage Distance (dCp)	10	mm	2)
Clearance Distance (dCI)	6	mm	2)
Comparative Tracking Index (CTI)	275		(group IIIa)
Load Voltage Category	OV 3		According to EN 50178
Pollution Degree	PD2		According to EN 50178