What is a MCB and how does it work?

An MCB is an automatically operated electrical switch. Miniature circuit breakers are intended to prevent damage to an electrical circuit as a result of excess current. They are designed to trip during an overload or short circuit to protect against electrical faults and equipment failure.

How MCB works on the magnetic effect of current?

MCB contains an electromagnet which becomes strong enough to separate a pair of contacts and thus breaks the circuit when the current exceeds the rated value. So, MCBs work on the magnetic effect of electric current. (d) Describe the principle of working of an electric motor.

How does an MCB work why is it preferred over a fuse?

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.

How many sockets can a 16A MCB hold?

For a single socket =13A (OK) and for a double socket = 26A (not OK). If 16A then that would be one socket; but if the cable is 2.5 and doesnt exceed the area permitted change the breaker to 20 A then you can have an unlimited number.

What is the difference between an MCB and RCD?

MCB stands for Miniature Circuit Breaker, and is an electrical switch designed to automatically work to protect an electrical circuit from damage caused by overcurrent. The RCD works by detecting an imbalance in the circuit, and automatically cutting off all power before injury or electrocution can occur.

Does MCB work on heating effect of electric current?

MCB does not work on the heating effect of current. MCB is a special kind of electrical switch which automatically turns off when the current in the circuit becomes too large, and cuts off the electricity supply.

How is MCB different from a fuse How can we prevent overloading and short circuiting?

The cross-section of an ABB miniature circuit breaker, showing the bimetal in yellow, the coil in green and the extinguishing chamber in blue. With short-circuit tripping, however, the MCB must trip as quickly as possible. The bimetal is just too slow.