An MCCB (molded case circuit breaker) is a type of circuit breaker that is used to protect electrical circuits from overcurrent. It is a type of switch that is designed to open when the current flowing through it exceeds a predetermined value. This prevents damage to the circuit and the equipment connected to it.
The internal circuit diagram of an MCCB is relatively simple. It consists of a number of components, including a trip mechanism, a contact assembly, and a housing. The trip mechanism is responsible for opening the circuit when the current exceeds the predetermined value. The contact assembly is responsible for making and breaking the circuit. The housing protects the internal components of the MCCB.
The trip mechanism of an MCCB typically consists of a bimetallic strip and a thermal fuse. The bimetallic strip is made of two different metals that have different coefficients of expansion. When the current flowing through the bimetallic strip exceeds the predetermined value, the strip bends and causes a switch to open, which breaks the circuit. The thermal fuse is a small piece of metal that melts when the current exceeds the predetermined value. This causes the fuse to open, which breaks the circuit.
The contact assembly of an MCCB consists of a number of contacts that are arranged in a series. When the circuit is closed, the contacts are in contact with each other and the current flows through the circuit. When the circuit is opened, the contacts are separated from each other and the current is interrupted.
The housing of an MCCB protects the internal components of the breaker from damage. The housing is typically made of a metal or plastic material that is resistant to heat and corrosion. The housing also provides a means of mounting the breaker to a panel or other surface.
MCCBs are used in a wide variety of applications, including residential, commercial, and industrial settings. They are used to protect circuits from overcurrent, which can damage equipment and cause fires. MCCBs are an essential component of any electrical system.
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