MCCB Vs MCB

We need to have sound safety mechanisms for our electrical appliances and devices. The safety mechanism must be strong enough to maintain the integrity of electrical circuits and protect them from damage. To ensure safety, circuit breakers are installed in the buildings.

Two of those circuit breakers that ensure complete protection against overloading and short-circuiting are MCBs and MCCBs. These components are powerful enough to keep the circuit away from any fire hazard. Though MCB and MCCB serve as efficient fuses, there are some vital differences between them. The following is a detailed list of such differences between MCCB and MCB.

The vital differences between MCB and MCCB:

There are a few bases on which MCBs and MCCBs differ. They are as follows:

Nature of protection:

Though both the circuit breakers provide protection to electrical devices, MCB and MCCB differ in their nature of protection. MCBs are triggered when there is a current overflow through circuits in order to save us from electrocution. They also turn off as soon as they sense any possibility of short-circuiting.

MCCBs, on the other hand, aim to prevent overloading and overheating of electrical circuits. They are triggered as soon as an overload initiates. The bimetallic part of MCCBs helps them to disintegrate the circuit whenever it is exposed to any overload. They are turned off when the overload dies off.

Current rating:

Current ratings of MCBs and MCCBs differ vastly. The current rating is the maximum amount of current that can be allowed to flow without destroying the circuit. The current rating of MCB is around 100A for MCBs. MCCBs have a higher upper limit. Their current ratings range from 10A to 200A.

Definitions:

MCBs and MCCBs are two different types of circuit breakers that form safety mechanisms for any electrical circuit. MCB means Miniature Circuit Breaker whereas MCCB means Moulded Case Circuit Breaker.

Interrupt rating:

The interrupt rating of MCBs is much lower than that of MCCBs. For MCCBs, it ranges from 10kA to 200kA whereas, for MCBs it is as low as 1kA.

Tripping mechanism:

The tripping mechanism of circuit breakers allows them to control hazardous operating conditions of electrical circuits. During such conditions, the circuit becomes open due to this tripping mechanism of the breakers. MCBs have fixed tripping circuits while MCCBs have movable tripping circuits.

No. of poles available:

MCCBs have a higher number of poles as compared to MCBs. The no.of poles of MCBs can be 1, 2 or 3, whereas, the no.of poles of MCCBs can go up to 4.

Mode of control:

MCBs and MCCBs are both efficient circuit breakers that have different modes of control. Though MCBs do not provide any remote access to their mechanism, MCCBs can be controlled by remote using shunt wires.

Applications:

MCCBs are meant for high-power circuits. They find their use in the industrial sectors for heavy-duty. On the other hand, MCBs work best for low-energy circuits and domestic appliances.

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