Molded Case Circuit Breaker
Rated insulation voltage this series up to 1000V, suitable for power distribution network with AC 50Hz, rated voltage 400V (690V), rated current to 800A, used for distribution of electrical energy and protection the circuit and power equipment from overload, short circuit, under-voltage, and other faults. At the same time, it can also be used as the infrequent start and overload, short circuit, under-voltage protection of the motor.
The circuit breaker has the characteristics of small size, high breaking capability, and short flying arc. The circuit breaker can be installed vertically or horizontally.
This product conforms to IEC60947-2, GB/T14048.2, and other standards.
|Number of poles||3,4||3,4||3,4||3,4||3,4||3,4||3,4||3,4||3,4||3,4|
|Rated voltage Ue(V)||AC400V||AC400V||AC400V||AC400V||AC400V||AC400V||AC400||AC400V||AC400v||AC400V|
|Rated insulation voltage Ui(V)||800V||800V||800V||800V||800V||800V||800V||800V||1000V||1000V|
|0perat ion life (cycle)||ON||1000||1000||1000||1000||1000||1000||1000||1000||500||500|
|Automatictripping device||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic||Thermo – electromagnetic|
What is MCCB?
MCCB is shorthand for Moulded Case Circuit Breaker. When the total current surpasses the limitation of a micro fuse box, the user employs it as just another sort of overcurrent protection device. The MCCB protects from overvoltages as well as fault current failures, as well as shifting the circuits.
Users may utilize it even in household applications for more outstanding current ratings and fault occurs levels. Users use MCCBs in commercial processes because of their average comprehensive ratings and high breakdown capacity. MCCBs can also safeguard capacitor banks, generators, and the distribution of main electric feeders. When an application requires discriminatory practices, customizable overloading settings, or ground-fault security, it provides suitable protection.
Working Principle of MCCB?
To offer the trip mechanisms for prevention and isolation, the MCCB combines a temperature-sensitive device (the thermal element) with a current responsive electromagnetic device (the magnetic element). As a result, the MCCB can provide:
- Protection against Overload.
- Protection against short circuits and electrical faults.
- Disconnection switch (electrical).
The thermally sensitive element of the MCCB provides overload prevention. When subjected to high temperatures, this component is effectively a bimetallic contact, which comprises two metals increasing at different rates. Under typical working circumstances, the other metals’ connection allows electric current to pass through the MCCB.
Due to the various thermal rates of heat expansion within the contact, the bimetallic connection will heat and flex away when the current surpasses the tripping value. The contact will eventually bend to physically pressing the tripping lever and unlatching the links, interrupting the circuit.
Electrical Fault Protection against short circuit currents
Based on the theory of electromagnetism, MCCBs give a rapid reaction to a short circuit problem. When electricity runs through the MCCB, it contains a solenoid coil that creates a modest electromagnetic field. The electromagnetic field created by the electromagnet is insignificant during normal operating conditions. However, when a short circuit develops in the circuit, a vast current starts flowing through to the solenoid, establishing a tremendous electromagnetic field that lures the trip bar and exposes the contacts.
Electrical Switch for disconnection
Users can utilize MCCBs as manual disconnection switches and tripping mechanisms in an accident or restoration activity. When the contact releases, MCCB can generate an arc. MCCBs include inbuilt arc dissipation systems that help to quell the arc.