MCCB

Q1. What is an MCCB?

An MCCB (Moulded Case Circuit Breaker) is a protective device used for low-voltage electrical circuits. It protects against overload, short circuit, and sometimes ground faults in industrial and commercial applications.

Q2. What is breaking capacity in MCCB?

Breaking capacity is the maximum fault current that the MCCB can safely interrupt without damage. It is expressed in kA (kiloamps).

Q3. Can MCCB be reset after tripping?

Yes. After identifying and fixing the fault (overload/short circuit), MCCB can be reset manually by switching it back ON.

Q4. Where is MCCB used?

Industrial power distribution

Commercial buildings

Motor protection

Generator and transformer protection

Backup power systems

Q5. What is the difference between MCCB and MCB?

MCB (Miniature Circuit Breaker): Handles small currents (up to ~125A), commonly used in homes/offices.

MCCB (Moulded Case Circuit Breaker): Handles higher currents (up to ~2500A), used in industries with adjustable trip settings.

Q6. What are the main functions of an MCCB?

Protects electrical circuits from overload

Protects against short circuit faults

Provides manual switching of circuits

Ensures safe isolation of circuits during maintenance