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RCCB is used to protect the electrical circuit from earth fault. Formally It is called as ELCB (Earth leakage Circuit Breaker). Sometimes it is also called as RCD (Residual current Device).
RCCB is named as Residual current circuit breaker because of it protects against residual current. Residual current means flow of leakage current between live conductor to earth. Current can flow in two different path, one is neutral and another one is earth. In this, under normal condition the load is always connected in between the phase terminal to neutral terminal, hence the flow of phase current (load current) is equal to neutral current. Consider earth fault is occurred in the load means the leakage current starts flow through a new path, from phase terminal to earth. This leakage current is called residual current. RCCB is specially designed to protect the electrical circuit against earth fault and human from electrical shock.
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RCCB consists of CBCT (Core Balanced Current Transformer),
CBCT: Core Balanced current transformer is used to sense the unbalance current flow in the circuit. If unbalance detect, the CT provide the unbalance current to the relay operating coil.
In this video, we are going to study about CBCT, working principle, current voltage value testIing with different burden resister, CURRENT ANA VOLTAGE rating of CBCT