MCCB Full Form

What is the full form of MCCB?

Molded Case Circuit Breaker is known by the abbreviation MCCB. The MCCB is a safeguard that prevents the overloading of the circuit. Additionally, it features a manually turned switch to trip the circuit. The apparatus has two arrangements: one for overcurrent and the other for over-temperature. In addition, the bimetallic contact found in the MCCB undergoes contraction and expansion due to variations in the device's temperature. During regular operation, the contacts allow current to flow through the circuit. But as the current rises above the fixed level, their contacts warm up and enlarge until they open. As a result, the circuit cuts off the main supply and protects the device from harm.

This Story also Contains

1. What is the full form of MCCB?
2. Principle of operation of MCCB
3. Qualities of MCCB
4. Advantages of MCCB
5. Disadvantages of MCCB

Principle of operation of MCCB

• Thermal overload: MCCB protects against thermal overload using temperature-sensitive equipment. When warmth builds up between the conductor and insulator, this condition develops. Insulations that are not checked can cause short circuits. A bimetallic part of the MCCB begins to heat up and bend away because of the excessive heat. The circuit flow was terminated when the bending condition pushed the trip bar.

• Short circuit: MCCBs have a solenoid coil that operates on the principles of electromagnetism in short circuits. When there was a short circuit, a lot of current started to flow through the solenoid, creating a powerful electromagnetic field that attracted the trip bar and opened the current contract.

• Earth fault protection: The internal arc dissipation procedures of the MCCB help in the emergency disconnecting of switches. It can be applied to an electrical switch, where the MCCB arc can be manually pulled to cut off the current flow.

Qualities of MCCB

• Protect against overstimulation

• Protection against electrical problems

• Circuit activation and deactivation

MCCBs are widely used in Photovoltaic (PV) systems in place of MCBs (miniature circuit breakers) since they can be manually or automatically disconnected. To protect them from chemicals, rain, dust, and other factors, MCCBs are maintained in a molded box.

Large currents from these devices occasionally require proper maintenance, which can be carried out by frequently washing, lubricating, and testing.

Advantages of MCCB

• The MCCB contains a feature that protects against electrical device failure.

• The size of this device is small, thus saving much space in the panel design.

• MCCB can fix several issues before needing to be replaced.

• Single phasing due to a fault in just one phase is not an option when MCCBs are required.

• MCCB trips down during faults but takes less time to reset and turn on.

• MCCBs are employed as overcurrent, earth fault, and under-voltage protection for electrical feeders.

Disadvantages of MCCB

• For domestic, specialized, and small-scale industrial purposes, MCCB has a restricted application.

• Molded Case Circuit Breakers cannot be utilized in high-voltage industrial settings.