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What Is a MCCB?

MCCB stands for molded case circuit breakers to safeguard electrical circuits and their components from overcurrent. If the circuit breaker doesn’t isolate this current at the appropriate time, an overload or a short circuit will occur. These devices have a wide frequency range, making them suitable for various electrical circuit protection applications. In addition, they come in current ratings ranging from 15Amps to 2500Amps, allowing them to use in both low- and high-powered applications.


Functions of MCCB:

Commonly, you can use MCCBs (Molded Case Circuit Breakers) to replace MCBs (miniature circuit breakers) in PV systems, and you can disconnect them automatically and manually. You can protect the MCCBs from dust, rain, oil, and other pollutants that can contain them in a molded casing. Because these devices deal with high currents, they require periodic maintenance, which you can accomplish through frequent cleaning, lubrication, and testing. Because these devices tackle high electric currents require regular maintenance, which you can achieve through recurring cleaning, lubrication, and testing.

  • They protect your electrical equipment: All electrical equipment needs a constant current flow to function properly. Therefore, you must install the MCCB or MCB depending on the current load. In addition, you can safeguard the fragile machine control systems by separating the power supply during an electrical fault.
  • It helps prevent fires: MCCBs that satisfy industry requirements and are of good quality, technicians, recommend them to ensure optimal safety. These electromagnetic devices detect faults during electrical surges or short circuits to safeguard them from fire, heat, and explosion.


Molded Case Circuit Breaker MCCB


Components and Specifications of MCCB:

* Frame

It’s also known as the molded case, and it’s where manufacturers mount all the circuit breaker components in an insulated container. To provide high dielectric strength within its compact design, manufacturers make it of a thermoset composite resin or a glass polyester. The name is given based on the type of molded case and is also used to identify the qualities of the breaker (maximum voltage and current ratings).


* Operating Mechanism

You can use the operational mechanism to open and close the connections. You can determine the pace at which the contacts open and close by how quickly you move the handle. The handle will be present in the middle position if the contacts trip. It is impossible to trip the breaker in the on-position; “trip-free. “When the breaker trips, you must first push the handle to the off position and then to the on-position if the handle is in the middle. The different handle positions are essential in finding the defective circuit when you arrange the breakers in a group, such as on panel boards. You can find a manual trip to test the mechanism on a few breakers.


* Arc Extinguisher

Arc Extinguisher creates an arc when a circuit breaker interrupts a current flow. An arc extinguisher aims to contain and divide the curve, effectively extinguishing it. A high-strength insulating box encloses the arc extinguishing chamber, mostly made up of a stack of steel plates. The current traveling through the ionized area of the contacts generates a magnetic field surrounding the arc and the arc extinguisher when the connections split due to an interruption.


* Trip Unit

The Trip Unit is the circuit breaker’s brain. In the event of a short circuit or a persistent overload current, the primary function of a tripping unit is to trip the operating mechanism. You can use the electromechanical trip devices in traditional molded case circuit breakers. Combining a temperature-sensitive device with a current-sensitive electromagnetic device, which acts mechanically on the trip mechanism, protects a circuit breaker.


Specifications of MCCB

  • UE – Rated Operational Voltage.
  • UI – Rated Insulation Voltage.
  • UIMP – Impulse withstand voltage.
  • In – Nominal Rated Current.
  • ICS – Service Short Circuit Breaking Capacity.
  • ICU – Ultimate Short Circuit Breaking Capacity.


Working of MCCB

It mainly operates in two ways:

  • Overload trips.
  • Short circuit.

You can use a temperature-sensitive device in the event of an overload tripping. A bimetallic strip is another name for this temperature-sensitive gadget. When the current exceeds the overload capacity, the bimetallic strips heat up and bend away from the contact, interrupting the supply.

These bimetallic strips provide a time gap for the MCCB to trip. Suppose the overcurrent is only for a short time. These bimetallic strips allow current to flow without the circuit breaking. The circuit will trip if the current sustains for a long time.

You can use the electromagnetic coil to perform short circuit tripping operations. The solenoid coil produces an insufficient electromagnetic field to attract the trip bar in regular operation. However, developing a large current in a short circuit allows the solenoid coil to create a sizeable electromagnetic field to attract the trip bar. As a result, the breaker opens and stops the flow of supply when the solenoid coil attracts these trip bars.

These short circuits occur in a split second.


Available Products

GYCM3-125DC 100A Molded Case Circuit Breaker

GYCM3 125DC 100A 2 MCCB

At high ambient temperatures, you will require dependable protection. According to IEC60947-2, the ultimate short circuit breaking capacity of an ICU is 25kA. It is reclosable for the shortest possible period at a standstill. It has disconnector qualities that are reliable and switch under load. The MCCB is available upon request. This 100A will stop the current flow and protect the circuit from damage because of an overcurrent or short circuit flow.


GYCM3-250DC 225A Molded Case Circuit Breaker

GYCM3-250DC 225A Molded Case Circuit Breaker (MCCB)

It is fast and best used for the shortest possible period at a standstill. This 225A is an upgraded product available in the market as it best suits the equivalent distribution of current and protection from overload and short circuits. This MCCB has a high breaking capacity that you can install vertically and horizontally. This product is also available upon request.