A molded case circuit breaker literally protects a miniature circuit breaker from excess load currents. They are also used in appliances where an adjustable trip setting may be desired. A molded case circuit breaker is often abbreviated as MCCB. It is more flexible than a plug-in breaker because it can be used over a wide range of frequency and voltages. The trip setting of this type of breaker can also be adjusted to any desired value and its amperage rating could be up to 2500A. It does three main things.
- It protects against overload conditions.
- It protects against basic electrical faults such as a short circuit.
- It can be used for switching a circuit on and off.
Due to the fact that molded case circuit breakers are flexible in their current and voltage requirements, they can be used for a wide range of purposes. Whether it is a low-power use or high-power use, an MCCB will do the job. Molded case circuit breakers are used in so many industries.
Operating principle of an MCCB
A molded case circuit breaker works like other circuit breaker types. It uses the principle of magnetism and thermal properties of substances. The way this device guides against faults is different from how it protects against overload or excess currents. For fault protection, it uses the principle of electromagnetic induction. On the other hand, it uses a thermal mechanism to guide against overload or excess current condition. If you need to trip the breaker manually, you can make use of a disconnection switch.
Some areas of application of a Molded case circuit breaker
MCCB’s are used for the following:
- To protect main electric feeder
- To protect a capacitor bank
- Generator protection
- Welding protection
- Motor protection
- When an adjustable trip setting is needed.