Which protection is provided by a MCB as opposed to an RCCB?

Which protection is provided by a MCB as opposed to an RCCB?

• A. Overcurrent protection (short circuit/overload).
• B. Earth-leakage protection by sensing residual current.
• C. Voltage regulation.
• D. Surge protection.

Answer: (A)

Overcurrent protection is what an MCB provides. An MCB (miniature circuit breaker) is designed to interrupt the circuit when the current becomes too high, protecting conductors from overheating during overloads and stopping damage from short circuits. An RCCB, on the other hand, detects earth leakage by sensing any imbalance between live and neutral current and trips to prevent electric shock. Voltage regulation and surge protection are handled by separate devices (voltage regulators or power conditioning equipment, and surge protective devices), not by an MCB. So the protection offered by an MCB, in contrast to an RCCB, is overcurrent protection.

Overcurrent protection is what an MCB provides. An MCB (miniature circuit breaker) is designed to interrupt the circuit when the current becomes too high, protecting conductors from overheating during overloads and stopping damage from short circuits. An RCCB, on the other hand, detects earth leakage by sensing any imbalance between live and neutral current and trips to prevent electric shock. Voltage regulation and surge protection are handled by separate devices (voltage regulators or power conditioning equipment, and surge protective devices), not by an MCB. So the protection offered by an MCB, in contrast to an RCCB, is overcurrent protection.