Molded case circuit breakers, commonly referred to as MCCBs, play a crucial role in electrical systems, safeguarding them from the potential damage caused by overloads and short circuits. These breakers are compact and offer a cost-effective solution for protecting both commercial and residential electrical systems.

Understanding the Basics

An MCCB is a type of automatic switch that can interrupt the flow of current in a circuit when it exceeds a preset limit. This limit, known as the trip current, is carefully chosen to protect the wiring, equipment, and appliances connected to the circuit. Unlike fuses, which sacrifice themselves to interrupt the circuit, circuit breakers can be reset and reused. MCCBs are typically made from a combination of plastic and metal, with the plastic case providing insulation and protection from dust and moisture. The metal components, such as the contacts and trip mechanism, are responsible for interrupting the circuit and providing a secure connection.