HTRS 50 -SBI 4-20mA inst. , HTRS50-SBI4-20mAinst.

LEM HTRS 50-SBI 4-20mA inst. HTRS Series Open Loop Hall Effect Current Transducer

LEM HTRS 50-SBI 4-20mA inst. Product Overview

The HTRS 50-SBI is an open-loop Hall effect current transducer from LEM's HTRS Series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic separation between the primary and secondary circuits . This split-core transducer is specifically designed for trackside equipment such as point machines, crossing gates, and signalling systems, with a 4-20mA current output suitable for remote monitoring and digital control systems .

Rated for 50 A nominal with a measuring range of ±100 A (up to twice the nominal value), it outputs a 4-20 mA current signal with ±2% overall accuracy at 25°C . The device offers a frequency bandwidth of 30 kHz (-3 dB) and a response time of 20 µs at 90% of rated current . Supply voltage range is 11.5 V to 26 V DC (typically 24 V) with a maximum current consumption of 50 mA . Mass is 35 g and operating temperature ranges from -40°C to +85°C . Insulation test voltage is 6 kV RMS at 50 Hz for 1 minute, with 12.7 mm creepage and clearance distances. The split-core design enables easy installation without disconnecting cables, and the insulating plastic case is recognized according to UL 94-V0. The device comes with a 5-year LEM warranty .

LEM HTRS 50-SBI 4-20mA inst. Key Specifications

LEM HTRS 50-SBI 4-20mA inst. Key Advantages

The HTRS 50-SBI employs open-loop Hall effect technology with an innovative primary circuit (patent pending) and two ASICs for precise magnetic field detection, delivering ±2% accuracy while providing galvanic isolation with a 6 kV insulation test voltage . The split-core design enables fast, non-intrusive installation without disconnecting existing cables, making it ideal for retrofitting existing systems . The 4-20 mA current output is standardized and compatible with most PLCs and remote monitoring systems. The device offers excellent immunity to external interference, with a maximum deviation caused by neighbouring conductors of only 0.3%, and the positioning error of the primary conductor is negligibly small compared to previous solutions . The compact 35 g design is more than 70% lighter than previous split-core transducers for such applications . The wide -40°C to +85°C operating temperature range ensures reliable performance in harsh outdoor environments.

LEM HTRS 50-SBI 4-20mA inst. Typical Applications

Points condition monitoring for railway trackside applications
Signal light indication
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Automation and control systems
Photovoltaic plant DC current monitoring
Crossing gate control systems
Signalling systems and point machines

Why Choose the LEM HTRS 50-SBI 4-20mA inst.?

The HTRS 50-SBI combines a 50 A rated current and ±100 A measuring range with a standardized 4-20 mA output in a compact, lightweight split-core package. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for trackside and industrial applications. The split-core design and DIN rail/panel mounting options offer easy installation and system integration. The device complies with International Railway Industry Standards (IRIS), UL508, EN50121-4, and EN50124-1 . The 5-year LEM warranty ensures long-term reliability, making it an ideal choice for railway trackside monitoring, signalling systems, and industrial automation applications where robust performance and easy installation are required .