LES Series

Closed‑loop Hall effect sensors delivering Fluxgate‑level precision, without the Fluxgate added cost

LES - Current Sensors

The LES Series current sensors are designed for accurate electronic measurement of small DC, AC, and pulsed currents, typically ranging from 6A to 50A. Optimized for industrial environments, LES sensors integrate the primary conductor directly into the package, simplifying system design while maintaining reliable galvanic isolation.

Thanks to their low offset drift and stable behavior over a wide operating temperature range from -40 °C to +105 °C, LES sensors deliver consistent performance in compact power‑electronics applications.

Based on closed‑loop Hall‑effect technology, the LES Series provides a cost‑effective alternative to Fluxgate‑based solutions while preserving high measurement accuracy.

LES – Features and benefits

Main characteristics

Closed loop multi-range current transducer
Voltage output
Unipolar supply voltage
Compact design for PCB mounting
Cost attractive
PCB mounting in various footprints (3 or 4 primary pins with various layouts)
With integrated primary conductors
Compact design
High overall accuracy at +105°C up to 2%

Benefits

Very low offset drift
Very good dv/dt immunity
Fast response time <0.4 µs
CAS footprint compatible

Typical applications

LES products are specifically designed for industrial applications, serving diverse purposes such as:

AC variable speed and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications
Solar inverters

LEM LES – Download & Technical Characteristic

LES Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LES 6-NP	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105°C
LES 15-NP	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105°C
LES 25-NP	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105°C
LES 50-NP	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 105°C

LESR Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LESR 6-NP	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 6-NP/SP1	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 15-NP	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 15-NP/SP1	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 25-NP	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 25-NP/SP1	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C
LESR 50-NP	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 85°C
LESR 50-NP/SP1	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 85°C

LKSR Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LKSR 6-NP	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LKSR 6-NP/SP1	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LKSR 15-NP	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LKSR 25-NP	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C
LKSR 50-NP	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 105 °C
LKSR 75-NP	Datasheet 3D	75 A	2.5 +/- 0.46875 V	-40 to 105 °C

LPSR Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LPSR 6-NP	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LPSR 15-NP	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LPSR 25-NP	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C
LPSR 50-NP	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 105 °C
LPSR 50-NP/SP2	Datasheet 3D	50 A	2.5 +/- 0.625 V	-40 to 105 °C

LXS Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LXS 6-NPS	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LXS 15-NPS	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LXS 25-NPS	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C

LXSR Series

Product	Document	Nominal value	Secondary Nominal Signal Value	Op. Temperature
LXSR 6-NPS	Datasheet 3D	6 A	2.5 +/- 0.625 V	-40 to 105 °C
LXSR 15-NPS	Datasheet 3D	15 A	2.5 +/- 0.625 V	-40 to 105 °C
LXSR 25-NPS	Datasheet 3D	25 A	2.5 +/- 0.625 V	-40 to 105 °C

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