What is the primary function of an RCCB (Residual Current Circuit Breaker) in an electrical system?

Concept & ReasoningIn normal operation the vector sum of currents through the RCCB's sensing core is approximately zero. An earth fault or shock path diverts some current outside the neutral return, producing residual current that triggers the device. An RCCB by itself does not provide overload/short-circuit protection; it is commonly coordinated with an MCB/fuse or replaced by an RCBO when both functions are needed.How to Solve It in the ExamRCCB → residual/earth-leakage shock protection.Important Exam PointRemember RCCB ≠ MCB. MCB protects overcurrent; RCCB detects imbalance.Related Revision PathThis question sits in the revision path Building Electrical Services → Electrical Protection →…