what is a molded case circuit breaker

A molded case circuit breaker (MCCB) is an electrical switch designed to protect a circuit from overload, short circuits, or other forms of electrical faults. It consists of a molded case made of insulating material that contains the switching mechanism, thermal trip unit, and electromagnetic trip unit.

MCCBs differ from traditional circuit breakers in that they have a specially molded case that provides increased protection against environmental factors such as dust and moisture. They also typically have higher ampere ratings than standard residential or commercial circuit breakers, making them suitable for use in larger power systems.
In addition to interrupting currents in the event of a fault, MCCBs are often equipped with additional features such as adjustable trip settings, motor circuit protectors, and ground fault protection. They are commonly used in a variety of industrial and commercial applications, including power distribution, control panels, and large machinery.