LEM HAT1200-S High Current Precision Hall Sensor | 1200A High-Accuracy Open-Loop Current Measurement

In an era of accelerating global electrification, accurate current measurement has become a core requirement for industrial control, renewable energy systems, and power electronics. According to industry analysis, the global current sensor market is expected to reach USD 4.765 billion by 2026, with a compound annual growth rate of 9.53%. LEM, a global leader in electrical measurement transducers, has developed the HAT1200-S high-current Hall sensor. With its outstanding performance and reliability, it is increasingly the preferred solution for engineers facing high-current detection challenges.

HAT1200-S Product Overview

The HAT1200-S is a key model in LEM’s HAT series of compact industrial current transducers. It is designed for electronic measurement of DC, AC, and pulsed currents while ensuring electrical isolation between the primary circuit (high-power side) and the secondary circuit (electronic control side). The sensor has a nominal primary current (IPN) of 1200A and a measuring range up to ±2500A (approximately three times the rated value), enabling it to handle load fluctuations and transient overloads. Based on open-loop Hall effect technology, the HAT1200-S achieves high measurement accuracy while maintaining a compact structure and low power consumption.

HAT1200-S Key Performance Specifications

HAT1200-S Key Advantages

Wide Current Range with Generous Headroom

The HAT1200-S has a nominal measurement current of 1200A and extends its measuring range to ±2500A. For applications that need to handle motor start-up currents, sudden load changes, or other transient high currents, this wide range means more reliable protection – a 3× headroom without needing additional range-switching circuitry.

High Accuracy and Linearity for True Measurement

±1% accuracy and ±1% linearity provide a reliable basis for current monitoring and control. In applications such as closed-loop current control of variable frequency drives or load monitoring in power supplies, this accuracy level ensures effective control quality and operational efficiency.

Fast Response for Capturing Transient Currents

A response time of <5 μs allows the HAT1200-S to capture current changes promptly. For scenarios requiring fast overcurrent protection or transient current monitoring – such as protection triggering in switching power supplies or transient control in motor drives – this feature is particularly critical.

High Isolation Voltage for Safety and Reliability

The 4.9 kVrms isolation voltage rating ensures safe separation between the high-power primary circuit and the low-voltage control circuit. In industrial environments and power electronics equipment, this isolation capability not only protects downstream control circuits from damage but also ensures operator safety.

Wide Operating Temperature for Harsh Environments

An operating temperature range of -40℃ to +105℃ enables the HAT1200-S to function reliably in conditions from extremely cold industrial environments to high-temperature power equipment. Whether in outdoor cabinets during northern winters or inside hot-running VFDs, the sensor remains stable and accurate.

Compact Design and Flexible Mounting

The compact modular design combined with panel mounting allows the HAT1200-S to be easily deployed even in space-constrained equipment. Its small size and weight of only about 270g save installation space and reduce overall equipment weight.

Bidirectional Measurement, AC/DC Compatible

Supports bidirectional measurement of AC, DC, and pulsed currents, allowing both positive and negative currents to be measured. Whether monitoring sine waves in AC variable-speed drives or measuring charge/discharge currents in battery-powered systems, the HAT1200-S is up to the task.

Low Power Consumption, Green and Efficient

With ±15 mA current consumption, the sensor maintains very low power draw even in high-current measurement applications. In power management and battery-operated systems where energy efficiency is required, this feature helps reduce overall system energy use.

LEM Quality Assurance

LEM is a benchmark company in the global electrical transducer field, headquartered in Geneva, Switzerland, with R&D and manufacturing sites in Switzerland, Japan, China, and Bulgaria. Products are CE, RoHS, and UL certified. Choosing the HAT1200-S means choosing quality proven in global markets over the long term.

HAT1200-S Typical Applications

Thanks to its 1200A high-current capability, 25kHz bandwidth, and high isolation level, the HAT1200-S is widely used in the following areas:

Industrial Drives & Control

Variable Frequency Drives & Servo Drives: Motor current closed-loop control, overload protection, and energy monitoring

AC Variable Speed Drives: Real-time motor current monitoring for performance optimization

DC Motor Drives: Accurate DC bus current measurement to ensure safe operation

Power Supply Systems

Switch Mode Power Supplies (SMPS) : Input/output current monitoring for precise power control and protection

Uninterruptible Power Supplies (UPS) : Real-time load current detection to ensure safe backup power switching

Welding Power Supplies: High-current welding process monitoring for consistent weld quality

Renewable Energy & Storage

Solar Inverters: PV array output current detection for efficiency optimization

Battery Energy Storage Systems (BESS) : Real-time battery charge/discharge current monitoring for system safety

Wind Power: Generator output current measurement for grid connection control and fault detection

Battery & Electric Vehicles

Battery Management Systems (BMS) : Battery pack charge/discharge current monitoring for accurate SOC/SOH calculation

EV Charging Systems: Charging station output current detection for safe charging and metering accuracy

Railway Transportation

Locomotive Energy Management: Current monitoring in onboard traction systems and auxiliary power supplies

Railway Signaling & Power Supply: Ensuring safety within the 10V to 6400V isolated measurement range

Test & Measurement

BatteryPowered Applications: Battery operating current detection for runtime optimization

Laboratory Test Equipment: Current measurement in power supplies and electronic loads