Littelfuse LSRX Sensor

LOAD SENSOR/ SELF-POWERED/ 5-2

Littelfuse LSRX Sensor – Self-Powered AC Load Sensor with Built-In Current Monitoring and Relay Output

The Littelfuse LSRX Sensor is a compact, self-powered AC load sensor designed to monitor current levels and provide reliable status indication for motors, fans, pumps, compressors, and other machinery. Featuring an integrated current transformer (CT), transducer, and high-current relay output, the LSRX Series activates its output contact when it detects a current of 4.5 Amps or greater, making it ideal as a motor status indicator or AC current proof relay.

This versatile sensor is perfect for a wide range of industrial and commercial applications—use it to interlock devices, monitor equipment operation, detect tool wear, signal pump loss of prime, and automate staging of chillers, mixers, or other machinery. It eliminates the need for separate control voltage and external current transformers, offering simplified installation and enhanced safety.

Key Features:

• Self-powered design – No external power supply required

• Quick-connect terminals – For fast, easy installation

• LED indicator – Provides clear visual relay status

• Monitors up to 200A loads – Built-in current sensor for broad range monitoring

• Integrated relay output – Switches alarm circuits, contactors, and resistive/inductive loads

Benefits:

• Eliminates need for auxiliary control voltage

• Saves installation time with plug-and-play connectivity

• Offers visual feedback for easy diagnostics

• Combines current sensing and relay functionality into one compact device

• Provides isolation between monitored and control circuits for added protection

Whether you're monitoring motor operation, interlocking equipment, or automating control sequences, the Littelfuse LSRX Sensor delivers dependable performance and installation efficiency.

Model: LSRX / LSRX-C Series
Application: AC Current Sensing, Equipment Monitoring, Motor Interlocks
Mounting: Panel or DIN rail compatible