Why we use MCBs instead of simple fuses in our homes, Shops, factories .
Answers
A Fuse
It is a safety device that protects against over current in an electrical circuit.
·Its components include a metal strip or wire that melts when there is an excess of electricity flowing through the circuit.
· When the wire or strip melts, it breaks the circuit thereby interrupting the flow of current. A fuse is a sacrificial safety device i.e. once it has served its purpose, it will have to be rewired or replaced.
Miniature Circuit Breakers (MCBs) are more advanced than fuses in that they are electromechanical devices that prevent circuits from overcurrent.
Miniature Circuit Breakers (MCBs)
·They are more advanced than fuses in that they are electromechanical devices that prevent circuits from overcurrent.
·Unlike fuses, MCBs need not be replaced after a fault and therefore can be reused. MCBs are an improvement over fuses and remove any large operating costs.
Advantages
MCBs are more sensitive to current than fuses.
They immediately detect any abnormality and switch off the electrical circuit automatically. This prevents any permanent damage to electrical appliances and human beings.
The MCB detects any excess current and breaks the circuit. This is reflected in the tripping of the MCB.
The fault in the electrical circuit can be identified easily if MCB switch is used. In this case, the Off position needs to be found. However, in a fuse, the entire wire needs to be checked. The fuse grip requires to be opened to identify the faulty zone making the work a little more tedious.
Using MCB is that the power supply can be resumed almost immediately. The techno MCB changeover switch needs to be pushed backed to the On position.In the case of a fuse, the whole wire will have to be replaced first.
The user is not exposed to any live wires or parts. But replacing a fuse is a tedious process, one which exposes the person to live current.
The best property of an MCB is that it can be used again and has minimal replacement and maintenance costs. This is not the case with fuses where the whole apparatus may require replacement when a fault is identified.
(Note-I don't own any rights over this answer. This is reffered from hplindia)
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