1 Answer
The principle of an MCB (Miniature Circuit Breaker) is based on protecting electrical circuits from damage caused by overload or short circuits. It automatically disconnects the electrical supply when it detects an abnormal current flow.
Here’s how it works:
In simple terms, the MCB keeps your electrical system safe by automatically shutting off the power when something goes wrong, either from an overload or a short circuit.
Here’s how it works:
- Overload Protection: When the current flowing through the circuit exceeds the rated value for a certain time (e.g., due to too many devices drawing power), the MCB's bimetallic strip heats up and bends. This bending triggers the mechanical mechanism to trip the breaker and disconnect the circuit, preventing overheating and possible fire hazards.
- Short Circuit Protection: When a short circuit occurs (a direct connection between the live and neutral wires, often caused by a fault), a large surge of current flows. In this case, the MCB detects the sudden surge using an electromagnetic coil. The coil generates a strong magnetic field that pulls the trip mechanism to quickly disconnect the circuit.
In simple terms, the MCB keeps your electrical system safe by automatically shutting off the power when something goes wrong, either from an overload or a short circuit.