ELCB circuit

The diagram below shows how a single phase ELCB circuit looks like. However, before I get down to explain more, please take note that I am using the name ELCB as a generic name, just like a circuit breaker.

1. ELCB is a short for Earth leakage Circuit Breaker. When it first came to be used, the devise is actually a voltage-operated device that was designed to detect a current leaking through the