Question

How MCBs prevent the damage of household electric items?

• A. By breaking the circuit, thus stopping the current
• B. By increasing the current in the circuit
• C. By decreasing the current in the circuit
• D. By keeping the current in the circuit constant

Answer 1

The correct option is A

By breaking the circuit, thus stopping the current

MCBs are Miniature Circuit Breakers. When there is an excess flow of current through the circuit in which MCB is included, a strong magnetic field develops around it. At this time, the coil attracts a piece of soft iron. The piece of iron moves and makes the switch of MCB work, thereby breaking the circuit. When the circuit breaks, the excess current stops reaching the household electric items and thus preventing damage to the appliances.