What is the principle of miniature circuit breaker?

All miniature circuit-breakers operate on the air-break principle where an arc formed between the main contacts is forced, by means of an arc runner, and the magnetic effects of the short-circuit currents, into metallic arc splitter plates.

What is MCB explain in detail?

MCB stands for Miniature Circuit Breaker. It automatically switches OFF electrical circuit during any abnormal condition in the electrical network such as overload & short circuitconditions. MCB works on bi-metal respective principle which provides protection against overload current&solenoidshort circuit current.

What is a miniature circuit breaker in short?

A Miniature Circuit Breaker is an electromechanical device designed to protect an electric circuit from over-current – A term to describe an electrical fault caused by either overload or short circuit. MCBs improve on this functionality as they are usually not destroyed during over-current so are reusable.

What is a miniature circuit breaker Class 7?

An MCB (Miniature Circuit Breaker) is a switching device which automatically turns off when current exceeds a safe limit. In case of overload or overcurrent, a fuse gets burnt and needs to be replaced whereas a circuit breaker can be reset (like a normal switch) to resume normal operation.

What is the working principle of a miniature circuit breaker?

This was a simple explanation of the miniature circuit breaker working principle. Miniature circuit breaker construction is very simple, robust and maintenance-free. Generally, an MCB is not repaired or maintained, it just replaced by a new one when required. A miniature circuit breaker has normally three main constructional parts. These are:

How does the MCB work in a circuit breaker?

As this mechanical latch is attached with the operating mechanism, it causes to open the miniature circuit breaker contacts, and the MCB turns off thereby stopping the current to flow in the circuit. To restart the flow of current the MCB must be manually turned ON. This mechanism protects from the faults arising due to overcurrent or overload.

Which is more reliable miniature circuit breaker or MCB?

It automatically switches off the electrical circuit during abnormal condition of the network means in over load condition as well as faulty condition. The fuse does not sense but miniature circuit breaker does it in more reliable way. MCB is much more sensitive to over current than fuse.

What is the working principle of a MCB?

This was a simple explanation of a miniature circuit breaker working principle. An MCB is very simple, easy to use and is not generally repaired. It is just easier to replace. The trip unit is the main part, responsible for its proper working. There are two main types of trip mechanism.