Protection Relay2018-04-24T12:39:58+00:00

A protection relay is a relay device designed to trip a circuit breaker when a fault is detected. The first protection relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as overcurrent, overvoltage, phase loss, phase sequence,surge protection, earth leakage, reverse power flow, over-frequency, and under-frequency.