Miniature Circuit Breaker (MCB)

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Miniature Circuit Breaker (MCB)

Safety is the first concern when choosing electrical appliances or devices. When the power fluctuates or excess current flows, it causes damage resulting in an overload or short circuit. Hence, it is essential to incorporate a device as a safety element to provide over current protection to the electrical devices/circuits. Fuse is one of the most common devices used in the early days to protect the circuit. A fuse contains a metal wire or strip that melts when an overflow of current occurs by stopping or interrupting the current.

In recent days the fuse has been replaced by a much more efficient and small electronic device known as MCB – Miniature Circuit

What Is A Miniature Circuit Breaker?

Have you ever imagined what happens to your household devices, fan, washing machine, oven, fridge, and many more when a short circuit or overflow of current happens? These devices get burnt and lead to fire accidents if proper circuit breakers are not installed in the devices. Miniature Circuit Breaker is a safety accessory with an electro-mechanical mechanism of action.

MCB is an automatic switch that opens when excessive current flows through the circuit. It can be reclosed without any manual replacement. In the case of a fuse, once it has been operated, it must be replaced or rewired, depending on the type of the MCB. Hence, fuse is known as one of the sacrificial devices. This is the main reason why MCBs are used as an alternative to the fuse in most of the circuits.  Also, whenever there is a fault in the circuit, the switches in the MCB automatically shut down and the fault of the device can be easily detected.

Handling MCB is relatively safe, and it quickly restores the supply. MCB – Miniature Circuit Breaker can be reset quickly and does not demand more maintenance costs. MCB works on a bi-metal respective principle that protects against overload current and solenoid short circuit current.

The picture of MCB is shown below.


Working Principle of MCB

The typical working real-time MCB is shown in the picture below.

When the current overflow occurs through MCB – Miniature Circuit Breaker, the bimetallic strip gets heated and deflects by bending. The deflection of the bi-metallic strip releases a latch. The latch causes the MCB to turn off by stopping the current flow in the circuit. This process helps safeguard the appliances or devices from the hazards of overload or over current. To restart the current flow, MCB must be turned ON manually.

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