A miniature circuit breaker (MCB) is an Electrical Switch which automatically switches off the electrical circuit during an abnormal condition of the network means in overload condition as well as faulty condition.
Nowadays we use an MCB in a low voltage electrical network instead of a fuse. The fuse may not sense it but the miniature circuit breaker does it in a more reliable way. MCB is much more sensitive to overcurrent than a fuse.MCB incoming terminal is connected through a solenoid coil followed by the bimetallic strip. And the output of the bimetallic strip will be connected to the output screw terminal. All the parts are connected in series with each other. Under Normal condition MCB act as a switch. By using actuator knob we can turn on or turn off the MCB.
Under overload condition which means the current flows through the MCB is higher than the rated current. Now I²*R loss is generated in the bimetallic strip and simultaneously heat will be produced. The bimetallic strip starts bending. Due to this, the tripping mechanism will be operated. Refer to the below mentioned…
Under the short circuit conditions, the high current flows through the solenoid coil which creates a strong magnetic field. Due to this, the plunger inside of the tripping mechanism will be getting attracted. The plunger pushes the tripping rod. The tripping rod trips the circuit breaker without time delay.
A miniature circuit breaker (MCB) is an Electrical Switch which automatically switches off the electrical circuit during an abnormal condition of the network means in overload condition as well as faulty condition.
Nowadays we use an MCB in a low voltage electrical network instead of a fuse. The fuse may not sense it but the miniature circuit breaker does it in a more reliable way. MCB is much more sensitive to overcurrent than a fuse.MCB incoming terminal is connected through a solenoid coil followed by the bimetallic strip. And the output of the bimetallic strip will be connected to the output screw terminal. All the parts are connected in series with each other. Under Normal condition MCB act as a switch. By using actuator knob we can turn on or turn off the MCB.
Under overload condition which means the current flows through the MCB is higher than the rated current. Now I²*R loss is generated in the bimetallic strip and simultaneously heat will be produced. The bimetallic strip starts bending. Due to this, the tripping mechanism will be operated. Refer to the below mentioned…
Under the short circuit conditions, the high current flows through the solenoid coil which creates a strong magnetic field. Due to this, the plunger inside of the tripping mechanism will be getting attracted. The plunger pushes the tripping rod. The tripping rod trips the circuit breaker without time delay.
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