A moulded case circuit breaker (MCCB) is a type of electrical protection device. It is used to protect the electrical circuit from excessive current, one that can cause an overload or short circuit.
The MCCB uses a temperature sensitive device with a current sensitive electromagnetic device to provide the trip mechanism for protection and isolation purposes. This enables the MCCB to provide:
- Overload protection,
- Protection against short circuit currents, and a
- Electrical switch for disconnection.
How it works is that it automatically cuts the power supply when there is a fault or an overcurrent situation, preventing damage to your electrical system. A moulded case circuit breaker can be used in both low-voltage and high-voltage systems. Furthermore, they also provide isolation of the circuit for maintenance.
MCCBs are usually installed in the distribution panel where the operators can see that the power is off. The moulded case, or the outer part, is where all the circuit breaker parts are kept in place. It is a sturdy and strong component that is made from glass polyester or thermoset composite resin. This material ensures that it has more than adequate non-conducting strength even though it is a small component.
The moulded circuit breaker can handle high currents. As such, they are typically used in industrial level machinery like a generator. They provide essential protection by shielding the linked circuits and the generator from any faults that might happen. Hence, a moulded circuit breaker can handle a generator’s high current rating and protect it as necessary.
Difference between traditional circuit breakers and moulded circuit breakers
A moulded circuit breaker has a higher interrupting capacity. As such, this means that it can handle larger loads and is generally used for industrial applications like generators.
Traditional circuit breakers can operate under 100 amps with an interrupting rating of below 18,000 amps. They don’t have tripping sensors to identify exceeding currents. And, as they only accommodate low circuits, they are typically used for small appliances and home wiring.
Remember IEP Power Products when you are searching for the best moulded circuit breakers. Our moulded circuit breakers are available with configurations of 3 and 4 pole across different sizes.