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MCCB, which is the full form of Moulded Case Circuit Breaker, refers to circuit breaker constructions. In this regard, the circuit breaker is essential and assembles the unit, which supports households, the industry of insulating material.
Definition of MCCB
MCCB is defined as the devices for closing or opening a circuit in nonautomatic means, as well as for opening a circuit automatically on predominant overcurrent, by not damaging itself. MCCB is the advanced version of MCB (Miniature circuit breaker). MCCB is generally available from 32 Amps to 1600 Amps, along with the voltage range of 230 Volt to 1.1 kilo Volt. MCCB consists mainly of nine different parts. These are-
- Arc chute
- Moving Contact
- Operating mechanism
- Base cover
- Terminal Connector
- Overload trip or Bimetallic contact
- Handle knob
- Manual trip button
- Current Transformer assembly
Types of MCCB
MCCB is considered the advanced version of MCB. Several types of MCCB are-
MCCB Types | Trips between full load current | Usages | Application | Operating time |
Type A | 2.3 times | It is highly sensitive, used in semiconductor manufacturing. | Domestic purposes | Less than 0.04 seconds |
Type B | 3-5 times | It usages in low inrush load, in making computer equipment which has low surge current level | Domestic, industrial and commercial purposes | Between 0.04 seconds and 13 seconds |
Type C | 5-10 times | It uses a low inrush load, it protects the inductive load. It is used in fluorescent lights, pilot devices, control devices, and coils. | Small scale industrial and commercial purposes | 0.04 seconds to 5 seconds |
Type D | 10-20 times | It is used in high inrush current flow, such as X-ray machines, high voltage winding machines etc. | Commercial, specialist domains | Between 0.04 seconds and 3 seconds |
Type K | 8-12 times | It is used in a high inrush current and is suitable for the motor application, transforms, er, auxiliary circuit etc. | Industrial area | Less than 0.1 seconds |
Type Z | 2-3 times | Protects from the long duration of currents | Industrial area | Less than 0.1 seconds |
Working principle of MCCB
- Thermal overload: MCCB protects thermal overload through temperature-sensitive equipment. This condition occurs when temperature gathers between the conductor and insulation. Unchecked insulations can lead to short circuits. MCCB has a bimetallic component that starts to heat and bend away due to excess heat. The bending situation pushed the trip bar and stopped the circuit flow
- Short circuit: MCCB contains solenoid coil, in short circuits, which is based on electromagnetism principles. A wide range of current started to flow through the solenoid, in the time of the short circuit, creating a strong electromagnetic field, hence it attracted the trip bar and finally opened the current contract
- Earth fault protection: MCCB has internal arc dissipation techniques that help to disconnect switches in emergencies. It can be used in an electric switch, where manually MCCB arc can be pulled to disconnect the current flow
Operating Mechanism of MCCB
- Thermal magnetic release: This is used in electromagnetic and bimetals assemblies for providing overcurrent protection
- Electronic release: The static or electronic MCCB uses current electronic circuitry to provide overcurrent protection
- Microprocessor release: Microprocessor release MCCB uses a microprocessor to protect over current situations
Advantages of MCCB
There are various advantages of Moulded Case Circuit Breaker (MCCB). For instance, MCCB consists of an adjustable trip that can be used for low and large currents. MCCB can interrupt large currents internally and can handle large amounts of current. MCCB also has a little rip, as it switches quickly, whenever faulting time or short circuit occurs. The movable trip of MCCB can instantly interrupt large power flows. Additionally, MCCB offers remote switches, where it has on/off features, which can be done manually. In addition, the compact and small is much easier to handle and much more advanced than MCB.
Disadvantages of MCCB
There are a few disadvantages of Moulded Case Circuit Breaker (MCCB). In this aspect, MCCB has limited application in domestic, special areas and small-scale industrial uses. Molded Case Circuit Breaker cannot be used in high voltage industrial areas.
Application of MCCB
- MCCB has high current voltage capacity as well as adjustable trip establishing capacity. In this aspect, it can be used for low current as well as high current settings
- MCCB is also used for a welding machine, as this machine creates a large amount of current that MCB cannot tackle
- MCCB has an adjustable trip, which protects large powered motors from overloading stages. MCCB has high tolerability with high inrush powers, that a large electrical motor can create
- MCCB is also used to protect current generators, which almost generates 100 amps
- MCCB can protect the capacitor bank, which is generally used for power factor correction
Conclusion
It can be concluded as MCCB is in popular use to prevent electrical short circuits. Various types of MCCB can be applied for domestic, industrial and commercial purposes. In Addition, it also can be advanced to fulfil requirements, by installing new features such as UV trip, remote closing etc.
