If any current leaks from any electrical installation, there must be any insulation failure in the electrical circuit, it must be properly detected and prevented otherwise there may be a high chance of electrical shock if anyone touches the installation.
An earth leakage circuit breaker does it efficiently. This means it detects the earth leakage current and makes the power supply off by opening the associated circuit breaker.
There are two types of earth leakage circuit breaker, one is voltage Earth Leaker Circuit Breakers (ELCB) and the other is current Earth Leaker Circuit Breakers (ELCB).
Earth Leaker Circuit Breaker (ELCB) has one huge advantage over Residual Current Circuit Breaker (RCCB) in that it is less sensitive to fault conditions, hence, causing less tripping.