LEM LF 1010-S Closed-Loop Hall Effect Current Sensor

LF 1010-S Product Overview

The LF 1010-S is the flagship model of the LF xx10 series from LEM (Switzerland), based on patented ASIC technology, designed for high-power industrial current monitoring up to 1000A. Using closed-loop Hall effect principle, its performance approaches that of expensive fluxgate sensors while maintaining the cost advantage of closed-loop Hall effect sensors.

The sensor operates on a wide-range ±15V to ±24V bipolar supply, with a rated current of 1000A, a measuring range up to ±2700A (2.7x overload capability), and a 200mA current output. It offers two aperture options: 40.5×13mm rectangular or φ38mm circular. The operating temperature range is -40°C to +85°C, compliant with EN 50178, EN 50155, and UL 508 international standards.

LF 1010-S Key Technical Specifications

LF 1010-S Key Advantages

ASIC Closed-Loop Technology — Performance Rivals Fluxgate: Utilizes LEM's patented ASIC technology — full-temperature accuracy 0.4%, zero drift only 0.1% IPN. Performance rivals expensive fluxgate sensors while overcoming fluxgate issues such as high noise, primary current start-up delay, and restart delay after overload

<0.5µs Ultra-Fast Response + 200kHz Ultra-High Bandwidth: Response time <0.5µs, di/dt following capability 200A/µs, bandwidth up to 200kHz — perfectly matched for high-frequency IGBT/PWM switching applications

±2700A Ultra-Wide Range: 2.7x overload capability — covers the full dynamic range from rated to peak current — handles transient high-current surges such as motor starting and load changes

5x Improvement in External Magnetic Field Rejection: Significantly improved external magnetic field rejection compared to previous generation — stable operation in complex industrial EMI environments such as VFDs and high-power drives, unaffected by magnetic fields from adjacent components

-40℃~+85℃ Ultra-Wide Temperature + Multiple Certifications: Covers applications from cold outdoor to high-temperature industrial environments — CE certified, compliant with EN 50178 (industrial) and EN 50155 (railway) standards

200mA High Current Output: Excellent noise immunity, high signal-to-noise ratio — suitable for long-distance signal transmission

Dual Aperture Options + Flexible Mounting: 40.5×13mm rectangular or φ38mm circular aperture — supports multiple panel mounting options — fully compatible with the mounting base of previous-generation LF xx05 series — drop-in replacement for old models

Why Choose the LF 1010-S?

±0.4% Full-Temperature Accuracy: From -40°C to +85°C, accuracy remains ±0.4% IPN — temperature stability far superior to traditional Hall sensors — no additional calibration required

<0.5µs Ultra-Fast Response: Accurately captures IGBT switching transients and PWM current harmonics — provides high-fidelity feedback for VFD current loop control

4.3kV High-Voltage Isolation: Reinforced insulation between primary and secondary — ensures control system safety — compliant with EN 50178 industrial and EN 50155 railway standards

±2700A Ultra-Wide Measuring Range: 2.7x coverage beyond 1000A rated value — handles overload and transient surges — improves system reliability

Compatible with LF xx05 Series: Same mounting base and pinout — direct drop-in replacement — easy upgrade path

5-Year Factory Warranty: LEM quality commitment — long-term supply assurance

LF 1010-S Target Applications

Industrial VFDs and servo drives, uninterruptible power supplies (UPS), switch-mode power supplies (SMPS), welding power supplies, battery-powered systems, DC motor drives, robotics control systems, renewable energy inverters, traction systems (auxiliary converters), air conditioners and home appliances