HMSR 8-SMS current transducer

Description

HMSR is a new generation of heavily insulated integrated current sensors from LEM. This product family offers a robust, compact, and highly accurate solution for measuring DC and AC currents in all highly demanding switching power applications for commercial and industrial applications. The HMSR is a micro-core-based, open-loop sensor with reinforced isolation and overcurrent detection (user-configurable and factory-set). These features make the device suitable for high-voltage applications requiring high precision and strong external field immunity. The primary conductor (pins 1 and 8) has very low electrical resistance and dedicated pads designed to withstand high surge currents, such as lightning strikes. The HMSR measures the magnetic field generated by the current flowing in the device's copper primary path. Thanks to the use of a micro-core magnetic core, the HMSR is immune to external fields, making the device well-suited for power electronics applications with high levels of interference. Reinforced isolation between primary (pins 1 and 8) and secondary (pins 9 to 15) offers the HSMR a small, cost-effective solution for high-side current measurement compared to resistive isolation solutions.

Key Features

• Multi-range open-loop current transducer
• Voltage output
• Dual overcurrent detection
• Single +5 V supply
• Galvanic isolation between primary and secondary circuits
• Low power consumption
• Compact design for SMT mounting
• Factory calibrated
• Wide bandwidth, ultra-low loss magnetic core
• Exceptionally low profile: h=6mm
• Small footprint
• Low electrical resistance 0.76mΩ
• Reinforced insulation
• High resolution
• High immunity to external interference
• Lightning impulse current ≤ 20kA

Applications

• Small drives
• HVAC inverters
• Devices
• Solar inverters

Technical data