LEM LA 200-P Closed-Loop Hall Effect Current Sensor

LA 200-P Product Overview

The LA 200-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.

The sensor operates on a ±12V ~ ±15V bipolar supply, with a rated current of 200A, a measuring range of ±300A (1.5x overload capability). It outputs a 100mA current signal with a turns ratio of 1:2000. Featuring PCB through-hole mounting with a 17×11mm rectangular aperture, it allows easy busbar or conductor passage.

With ±0.4% ultra-high accuracy, <0.1% linearity, <1µs response time, and 100kHz bandwidth, the LA 200-P complies with EN 50178 industrial safety standards, making it a classic benchmark for AC variable frequency drives, servo drives, UPS systems, and other industrial applications.

LA 200-P Key Technical Specifications

LA 200-P Key Advantages

±0.4% Ultra-High Accuracy (Closed-Loop Hall Technology): Utilizes closed-loop (compensated) Hall effect principle — active compensation design eliminates core saturation effects — accuracy far superior to open-loop sensors, linearity <0.15%

<1µs Fast Response + 100kHz High Bandwidth: Delay time <500ns, di/dt following >200A/µs — perfectly matched for high-frequency IGBT/PWM switching applications, providing timely and reliable triggering signals for overcurrent protection

±300A Wide Range: 1.5x overload capability — handles motor starting and load transient current surges

Superior Noise Immunity + Low Temperature Drift: Closed-loop architecture provides high external magnetic field rejection — offset current drift <±0.55mA across full -40℃~+85℃ temperature range — stable operation in complex industrial EMI environments such as VFDs and high-power drives

3kV High-Voltage Isolation + 7kV Impulse Withstand: Reinforced insulation between primary and secondary — EN 50178 compliant — meets 600V basic insulation and 300V reinforced insulation requirements

-40℃ ~ +85℃ Ultra-Wide Temperature Range: Covers applications from cold outdoor to high-temperature industrial environments — meets the needs of most industrial equipment

Compact PCB Through-Hole Mount Design: 17×11mm rectangular aperture, 4 secondary pins + 2 auxiliary mounting holes — weight only 40g — easily integrates into various circuit boards

Why Choose the LA 200-P?

±0.4% Ultra-High Accuracy + <0.15% Linearity: Among 200A-class PCB-mount current sensors, ±0.4% accuracy represents industry-leading performance — closed-loop compensation ensures accurate measurement across the full range — meets industrial precision control requirements

<1µs Fast Response: Accurately captures IGBT switching transients and current spikes during load changes — provides timely and reliable triggering signals for overcurrent protection

100kHz High Bandwidth: Accurately measures current waveforms up to 100kHz — perfectly matches the output characteristics of modern high-frequency switching power supplies and VFDs

3kV High-Voltage Isolation: Reinforced insulation between primary and secondary — EN 50178 compliant — ensures control system safety

-40℃ ~ +85℃ Wide Temperature Operation + Low Drift: Full-temperature offset drift <±0.55mA — suitable for outdoor enclosures, industrial field environments, and other harsh temperature scenarios

17×11mm Rectangular Aperture + Compact PCB Design: Easy busbar passage — 4 secondary pins + 2 auxiliary mounting holes — PCB mounting saves cabinet space — fits various industrial equipment applications

Low Power Design: Supply current only 16mA @ ±15V — significantly reduces power supply burden

LA 200-P Target Applications

AC Variable Frequency Drives & Servo Drives: Industrial motor drive current feedback control

DC Motor Static Converters: Motor drive current monitoring

Uninterruptible Power Supplies (UPS): Input/output current monitoring