Q. What is the work of static relay?

Answer

By comparing or measuring electrical quantities, the static relay triggers an action. Comparators, level detectors, zero-crossing detectors, and similar static electronic circuits are used to make the comparison and provide the output signal necessary to trip the circuit breaker. Unlike an electromagnetic relay, which has a moving armature, a static relay has no such components. While typical electromagnetic relays don't have any moving parts, developments in semiconductor technology have allowed static relays to replace them.