HAX 850-S , HAX850-S

HAX 850-S Open-Loop Hall Effect Current Transducer

HAX 850-S Product Overview

The HAX 850-S is an open-loop Hall effect current transducer from LEM's HAX series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). This panel-mount sensor provides a ±4 V instantaneous voltage output and is part of a series covering 500 to 2500 A, offering a single design for a wide current ratings range.

Rated for 850 A nominal with a bidirectional measuring range of ±2550 A, it outputs an instantaneous ±4 V ratiometric voltage signal at rated current. Accuracy is ±1% with ±1% linearity. Response time is 5 µs and frequency bandwidth is DC to 25 kHz. Supply voltage is ±15 V (±5%) with a maximum supply current of 20 mA. Electrical offset at +25°C is < ±20 mV, and hysteresis offset is < ±30 mV. Insulation test voltage is 5 kV RMS with impulse withstand voltage of 8.3 kV. Operating temperature range is -40°C to +85°C. Mass is approximately 450 g. Mounting is panel mount with a module package. Housing uses UL 94-V0 recognized materials.

HAX 850-S Key Specifications

Rated current: 850 A
Measuring range: ±2550 A
Output signal: Instantaneous ±4 V (ratiometric, analog voltage)
Supply voltage: ±15 V (±5%)
Accuracy: ±1%
Linearity: ±1%
Response time: 5 µs
Frequency bandwidth: DC to 25 kHz
Maximum supply电流: 20 mA
Output internal resistance: 100 Ω
Load resistance: >1 kΩ
Electrical offset: < ±20 mV
Hysteresis offset: < ±30 mV
Insulation test voltage: 5 kV RMS
Impulse withstand voltage: 8.3 kV
Creepage distance: 15.7 mm
Clearance: 12.7 mm
Overload capability: 30000 A
Operating temperature: -40°C to +85°C
Mass: 450 g
Mounting: Panel mount
Technology: Open-loop Hall effect
Housing: UL 94-V0
Standards: EN 50178:1997, UL 508, RoHS compliant

HAX 850-S Key Advantages

The HAX 850-S features an open-loop Hall effect design with an insulating plastic case recognized according to UL 94-V0 for flame-retardant protection. The ±2550 A measuring range provides substantial headroom for overload conditions, with overload capability up to 30,000 A. The 5 µs response time and DC to 25 kHz bandwidth capture fast-switching transients with high fidelity. The sensor offers easy installation, low power consumption, small size and space-saving design, with a single design covering a wide current ratings range. High immunity to external interference ensures reliable performance in industrial environments.

HAX 850-S Typical Applications

AC variable speed drives and servo motor drives
Static converters for DC motor drives
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Battery supplied applications
Power supplies for welding applications
Renewable energy systems and industrial power monitoring

HAX 850-S Why Choose the HAX 850-S?

The HAX 850-S combines an 850 A rating, ±2550 A measuring range, ±1% accuracy, and panel-mount design in a compact package optimized for industrial applications. Manufactured by LEM, a global leader in electrical measurement, it delivers reliable, accurate current sensing for demanding industrial environments. The open-loop Hall effect technology provides high immunity to external interference with low power consumption, while the single design for a wide current ratings range simplifies inventory and design efforts. The product is active and available for new designs with a lead time of 10 weeks.