Views: 0 Author: Site Editor Publish Time: 2022-09-26 Origin: Site
Micro circuit breaker is a device that many people will use in their lives, but not many people know the characteristics of its working principle. How does a circuit breaker work? What are the advantages of MCB?
What is a miniature circuit breaker?
What is the function of the MCB?
How does a circuit breaker work?
Micro circuit breakers are switches and circuit protection devices for mechanical operation. It is a kind of automatic circuit protection equipment for electric machinery operation. The MCB is used to interrupt the circuit during overload and short circuit. It can be used as an alternative to fuses for domestic applications. The advantage of MCBS over fuses is that they can be reused even after the circuit breaks after overload or short circuit. Moreover, they are more sensitive to faults than fuses.
1. The MCB can be turned on and off manually. This feature is very useful, especially during maintenance. The internal latch is made to hold the fixed contacts automatically once the knob is pushed to the ON position. When closed, the pressure exerted by our fingers on the knob releases the latch and opens the contacts.
2. When a device is overloaded, it draws more current from the power supply. This current flows through the bimetal sheet and heats it. A bimetallic strip deformed when heated will knock down the latch, opening the contacts and isolating the device from the power supply.
3. A sudden rise in current during a short circuit creates an MMF strong enough to project plunder onto the latch and release it, thus opening the contacts.
4. When the contact is opened under load, an arc is formed between the stationary contact and the moving contact. The contacts are designed so that the arc formed between them moves outward through the arc channel and reaches the arc separator or arc quencher. An arc separator or arc quencher is a device to increase the length of the arc, split and quench the arc.
In case of overload, more than the rated current is driven through the MCB. When an electric current flows through the bimetal, it heats up and bends, deflecting it and releasing the mechanical latch. The deflection time of the bimetallic sheet depends on the amount of current flowing through the sheet. The higher the current, the faster the bimetal will deflect. During a short circuit, the transient current flowing through the solenoid forces the plunger toward the latch. This action instantaneously releases the mechanical latch and immediately opens the contact.
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