LEM LF 1005-S Closed-Loop Hall Effect Current Sensor

LF 1005-S Product Overview

The LF 1005-S is a high-precision current sensor based on closed-loop Hall effect technology, from LEM (Switzerland), the global leader in electrical measurement. Featuring closed-loop compensation technology, it is designed for electronic measurement of DC, AC, and pulsed currents, with galvanic isolation between the primary and secondary circuits.

The sensor operates on a wide-range ±15V to ±24V bipolar supply, with a rated current of 1000A, a measuring range of up to ±1500A (1.5x overload capability), and a 200mA current output. It features multiple aperture options (40.5×13mm rectangular or φ38mm circular), an operating temperature range of -40°C to +85°C, and complies with EN 50178 and IEC 61010-1 international standards.

LF 1005-S Key Technical Specifications

LF 1005-S Key Advantages

Closed-Loop Hall Technology: Active compensation design eliminates core saturation effects — accuracy ±0.4%, linearity <0.1%

<1µs Fast Response + 150kHz High Bandwidth: Response time <1µs, bandwidth up to 150kHz — perfectly matched for high-frequency IGBT/PWM switching applications, accurately capturing high-frequency harmonics in switching power supplies

±1500A Wide Range: 1.5x overload capability — covers the full dynamic range from rated to peak current — handles motor starting and load transients

Superior Noise Immunity: Closed-loop architecture provides high external magnetic field rejection — passes IEC61000-4 series EMC certification

-40℃~+85℃ Wide Temperature Range + Low Drift: EN 50178 industrial standard compliant — typical temperature drift ±0.3mA — suitable for outdoor enclosures, rail transit, and other extreme temperature scenarios

Multiple Aperture Options + Flexible Mounting: 40.5×13mm rectangular or φ38mm circular aperture — easy busbar or conductor passage — supports both horizontal and vertical panel mounting — fits various industrial cabinet layouts

Why Choose the LF 1005-S?

±0.4% High Accuracy + <0.1% Linearity: Closed-loop compensation technology ensures accurate measurement across the full range — meets industrial precision control and high-power metering requirements — meets 0.5S class power metering standards

<1µs Fast Response + 150kHz High Bandwidth: Accurately captures IGBT switching transients and PWM current harmonics — provides high-fidelity feedback for VFD current loop control

3.8kV High-Voltage Isolation + 16kV Impulse Withstand: Reinforced insulation between primary and secondary — ensures control system safety — compliant with EN 50178 industrial safety standards — suitable for 1000V reinforced insulation and 1500V basic insulation scenarios

-40℃~+85℃ Wide Temperature Operation + Low Drift: Passes rigorous environmental adaptability tests — suitable for outdoor enclosures, rail transit, polar regions, deserts, and other extreme climate conditions

±1500A Wide Measuring Range: 1.5x+ coverage beyond 1000A rated value — handles overload and transient surges — improves system reliability

Multiple Aperture Options: 40.5×13mm rectangular or φ38mm circular aperture — easy busbar or cable installation — supports various panel mounting methods

LF 1005-S Target Applications

AC variable frequency drives and servo motor drives, DC motor drive static converters, uninterruptible power supplies (UPS), switch-mode power supplies (SMPS), welding power supplies, battery-powered equipment, renewable energy systems (PV inverters, wind power converters), traction systems (propulsion choppers, traction converters), industrial VFDs