The MCB is mainly used in low current circuit whereas MCCB is used for the heavy current circuit. Note: The rated current is the maximum current that the circuit breaker should draw. The rating current of MCB is 100 amps whereas the rating current of MCCB is 10 – 200 amps. The remote on / off is not possible in MCB whereas it is possible in MCCB by the use of shunt wire. Note: The interrupting current is the maximum current that the circuit breaker can interrupt without being disrupted. The interrupting current of the MCB is the 1800amps, and for MCCB it is 10k -200 k. Note: Pole in MCB is the number of phases uses by the circuit breaker for the switching and protection. The MCB has single, two, or three pole version, whereas the MCCB has single, two three or four pole version. When over current flows through the MCB and MCCB it shuts off the switch and hence protects the equipment from damage. Note: The tripping circuit turn on and off the flow of electrical current. The tripping circuit of the MCB is fixed whereas in MCCB it is movable. The MCB stands for Miniature circuit breaker whereas the MCCB stands for moulded case circuit breaker. The MCB is a type of switch which protects the system from overloaded current whereas the MCCB protects the system from over temperature and short circuit current. Thus, disconnected the circuit from the main supply and protects the equipment from damage. But as the current rises beyond the predefined value, then their contacts will warm and expand until the contacts are open. It consists bimetallic contact which expands and contracts when the temperature of the MCCB changes.ĭuring the normal operating conditions, the contact allows the current to flow through the circuit. One for the over temperature and the other for the over current. The MCCB has a manually operated switch for tripping the circuit. It is mainly used for high current applications. The current rating of MCCB is up to 2500 amps. It is mainly used in a place where adjustable tripping requires. It is a protecting device which protects the circuit from overloading. The MCCB stands for moulded case circuit breaker. When the current increases from the predefined limit, their movable contacts are disconnected from the fixed contacts which make the circuit open and disconnects them from the main supply. It has two contacts one is movable, and the other one is fixed. Their main function is to protect the equipment from overcurrent. The working principle of the miniature circuit is very simple. It easily senses the overcurrent caused by the short circuit. The miniature circuit breaker is an electromechanical device which, automatically, switch off the circuit whenever the abnormal condition occurs. Protects the equipment from over temperature and fault current.Īvailable in single, two and three versions.Īvailable in single, two, three and four versions. 
Type of switch which protects the system from overloaded current.
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