LEM LAH 100-P Closed-Loop Hall Effect Current Sensor

LAH 100-P Product Overview

The LAH 100-P 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 (compensated) Hall effect principle, it is designed for electronic measurement of DC, AC, and pulsed currents, with galvanic isolation between the primary and secondary circuits.

As one of the core models in the LAH series, the LAH 100-P features PCB through-hole mounting and a UL 94-V0 flame-retardant plastic case. With measurement accuracy up to ±0.25%, linearity better than ±0.15%, and bandwidth covering DC~200kHz, it is a classic choice for high-current monitoring in AC variable frequency drives, servo drives, and UPS systems.

LAH 100-P Key Technical Specifications

LAH 100-P Key Advantages

Closed-Loop Hall Technology: Active compensation design eliminates core saturation effects — accuracy up to ±0.25%, linearity <0.15%

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

±160A Wide Range: 1.6x overload capability — handles current surges during motor starting and load changes

Superior Noise Immunity: Closed-loop architecture provides high external magnetic field rejection — stable operation in complex industrial EMI environments such as VFDs and high-power drives

5kV High-Voltage Isolation + 12kV Impulse Withstand: Reinforced insulation between primary and secondary — EN 50178 compliant — suitable for 1000V basic insulation and 500V reinforced insulation

Compact PCB Mount Design: 6 primary pins (1.4×1mm, recommended PCB hole φ2mm) + 3 secondary pins (0.7×0.6mm, recommended hole φ1.2mm) — easy integration, weight only 24g

Ultra-Low Temperature Drift + 5-Year Warranty: Extremely low temperature drift — maintains stable accuracy across full operating temperature range — LEM quality commitment with 5-year warranty

Why Choose the LAH 100-P?

±0.25% High Accuracy + <0.15% Linearity: Closed-loop compensation technology ensures accurate measurement across the full range — meets industrial precision control requirements

<0.5µs Ultra-Fast Response + <200ns Delay: Accurately captures IGBT switching transients and current spikes during load changes — provides timely and reliable triggering signals for overcurrent protection

200kHz High Bandwidth: Accurately measures current waveforms up to 200kHz — perfectly matches the output characteristics of modern high-frequency switching power supplies and VFDs

5kV High-Voltage Isolation + UL 94-V0 Flame Retardant Case: Reinforced insulation between primary and secondary — ensures control system safety — compliant with EN 50178 industrial safety standards

-25℃~+85℃ Wide Temperature Operation + Low Drift: Suitable for industrial field environments, outdoor enclosures, and other harsh temperature scenarios — excellent temperature drift coefficient

Compact PCB Design: Primary side features multiple parallel pins — can be configured for 1 turn or 5 turns as needed — flexible adaptation to different current density requirements

LAH 100-P 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