Functional Features: Equipped with an RMS sensing electronic trip unit providing Long-Time, Short-Time, and Instantaneous (LSI) protection. Adjustable settings allow for coordination with upstream and downstream devices.

Application Scenarios: Main service entrance switches, feeder circuits in commercial buildings, and industrial distribution panels.

Material Composition: Thermoset polyester resin case for high dielectric strength and flame resistance. Silver-cadmium oxide contacts for high conductivity.

Working Principle: The electronic sensor continuously measures the RMS current. Digital logic processes this data against setpoints to trigger the trip mechanism when overcurrent conditions persist.

Precautions: Verify the electronic trip unit is powered (via internal sensors) before testing. Do not expose the trip unit to strong electromagnetic interference during calibration.