Discussion
Which of the following is not a valid type of circuit breaker?
Answer: D
KCCB is not a valid type of circuit breaker. ELCB (earth leakage circuit breaker), MCB (miniature circuit breaker) and RCCB (residual current circuit breaker) are all in use, to protect against earth leakage and overload and short circuit.
There is no circuit breaker called KCCB, so the fourth option is the one that is not valid. Of the three real ones, the ELCB is the older voltage-operated earth leakage device and the RCCB is the current-operated one that has replaced it.
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