[sabith]

How ELCB works?

[goutamsom]

ELCB is popularly known as RCCB ( Residual Current operated Circuit Breaker). Its works by sensing the leakage current. Inside the breaker there is CBCT( core balance current transformer) which sense the abnormality.

[sarnian]

Hello sabith

If you have two coils on top of each other (one for phase, one for neutral) both fields cancel each other completely. If there is somewhere a leak to earth, the currents in both coils are no longer the same, so the switch is triggered by the resulting electromagnetism.