Top 4 Components of MCB

Miniature Circuit Breaker (MCB) is an electrical small trip switch operated automatically when the electricity overload exceeds, used to protect from an electric short circuit up to 100amps in the motor feeders. It is an alternative product can be used instead of a fuse.

Few advantages should notify why miniature circuit breaker called it has an alternative product of a fuse. In our next blog, we will explain the advantages of using miniature circuit breaker instead of a fuse.

In this article, we would like to share the top 4 components of a miniature circuit breaker that works.

1. Frame

2. Operating Mechanism

3. Trip Unit

4. Contacts

Frame:-

Miniature Circuit Breaker frame consist molded case exterior. The primary function of a miniature circuit breaker is to provide a hard, mechanically strong, insulated housing so in that the remaining components are mounted.

Operating Mechanism:-

Miniature Circuit Breaker key point is that the operating mechanism supply in a method of opening and closing the circuit. The switch formed with a three position like on, off and tripped. If the current exceeds its limit, then the switch position will be tripped, if the current turned off by manually, then the switch will be in off position. The above points will make a maintenance person to determine the reason behind in the power cut.

Trip Unit:-

The trip unit acts as the brain of miniature circuit breaker device. It leads to activate the operating mechanism in the circumstance of overload or short circuit. It uses a thermal magnetic mechanism. To provide a protection from overload and short-circuit a bimetal and an electromagnet will work together.

Contacts:-

When a situation like an overload or short circuit occurs, to break the current flow contacts of a miniature circuit breaker will open in this circumstances electrical arc will form. It continues until the zero point in the AC cycle. In AC cycle the weakest point is the zero point which will not support the prolonged arc, to stop the current flow it breaks the arc.

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