Advantages of Miniature Circuit Breakers - The Insight

These days we usually use MCB in low power network rather than fuse. It has certain advantages over fuse.

·         It automatically turns off the electrical circuit during irregular condition of the network, means in over load condition and defective state. The fuse is not able to sense, however miniature circuit breakers sense it in more dependable manner. MCB is a lot more sensitive to over current compared to electric fuse.

·         One more benefit is, as the switch knob reaches its off point at the time of tripping, the defective zone of the circuit can be identified without any difficulty. However in case of fuse, its wire must be examined by opening grip, for checking the shock of fuse wire.

·         Fast restoration of supply cannot be possible in event of any fuse as fuses are supposed to be changed for reestablishing the supply. However in the case of MCB electrical, fast restoration is that you can imagine by just starting it.

·         MCB is more electrically harmless compared to fuse. Due to several advantages of it, in low voltage network, it is commonly used in place of old fuses.

Only one drawback of MCB compared to fuse is that this system is more expensive.

There are two procedure of its operation. One caused by thermal effect and the other caused by lectromagnetic effect of over current. The thermal process is accomplished with a bimetallic strip, every time nonstop over current moves through it, the bimetallic strip is heated and deflects through bending. This deflection of bimetallic strip discharges mechanical latch. As this latch is connected to operating machine, it opens the MCB links.

However in short circuit condition, abrupt increase of current, causes electromechanical movement of plunger connected to tripping coil of MCB. The plunger attacks the trip lever triggering instant release of latch, mechanism as a result, opening the circuit breaker contacts. This was a plain description of MCB working principle.

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