Residual Current Circuit Breaker is Essentially A Device Which Sense Current and Disconnects Any Low Voltage (Unbaranced Current) Circuit WHace is Any Fault Occcuit.

　　

　　

　　Residual Current Circuit Breaker Basically Is Installed to Prevent Human from Shocks or Death Caused by Shocks. It Prevents by disc.

　　Matches (Imbalance Occurs, as the fault Current Finds Another Earthing Path of Current).

　　

　　

　　

　　The TOROIDAL Transformer, Sensing Coil and Relay Together is Known as RCD 鈥? Residual Current device.

　　Coil of the device and Consequently, The RCCB TRIPS to disconnect the support every in normal condition. This is how the test circuit tests the reliability RCCB RCCB RCCB.