What is the RCCB?

RCCB is basically known as residual current circuit breaker. Residual current circuit breakers are a type of low-voltage circuit breaker. RCCB is used to protect against earth leakage fault current. RCCB have small current ratings, typically up to 160A. RCCB provides protection against lightning shock. This is because the role of the RCCB is mainly to detect earth leakage and trip the circuit if detected. There is a test circuit operation to check if the RCCB is working.