Do you need fuse if you have MCB?

Why use MCB instead of a Fuse? It detects any abnormality in the current flow and automatically switches off the electrical circuit. Faulty circuit trips to the Off position. On the other hand, in case of a Fuse, the complete fuse wire needs to be checked by opening the fuse grip for confirming the faulty zone.

Can I use an MCB as a fuse?

MCBs are a convenient “modern” replacement for a piece of fuse wire. However under very high current short circuits an MCB can weld itself closed whereas a fuse will always blow. There will be a (typically 100a) traditional fuse in most domestic installations to cover this eventuality.

Why is MCB preferred over fuse?

MCB is more preferable to electrical fuse because the metal wire melts in an electrical fuse and fuse gets destroyed when excess current flows through it so in MCB it is immediately turned off when excess current flows through it and the supply can be restored simply by switching the MCB on again.

Where are fuse and MCB used?

Circuit protection devices such as fuses and MCBs are used to safeguard any equipment from damages caused due to short circuits. The usage of these devices does not mitigate the chances of occurrence of a fault.

Is there any similarity between fuse and MCB?

Circuit protection devices such as fuses and MCBs are used to safeguard any equipment from damages caused due to short circuits. Both do the same thing: interrupt the current flow to the circuit or equipment and safeguard the circuit from electrical hazards.

Do I need MCB and RCD?

It is required by law to have 2 RCDs installed in your home such that they protect the power and light circuits. For circuit breakers, you need to have one MCB per circuit. The RCDs are usually installed near the main switchboard. The new MCBs are usually installed above or below the existing circuit breakers.

How is MCB different from fuse?

Fuse is an electrical device that self-destructs and stops the current flow in a circuit whenever the current exceeds the predefined value. MCBs are resettable circuit protection device that, on the occurrence of faults, stops the current flow in a circuit.