safe and reliable miniature circuit breaker (MCB) upto 63 AMPS coils widely used in the modern society?

Circuit breaker, which name 'CB' in abbreviation, commonly apply into the industrial production and daily life. Its main function is on/off power.

In China mainland, we named the circuit breaker used in low circuit as air switch, and HongKong named it as current leak circuit breaker.

And in high voltage network,common found air circuit breaker or vacuum circuit breaker. In China mainland, the one used in electric network under 35KV is mostly vacuum circuit breaker and the one use in electric network above 35KW is mostly air circuit breaker (such as SF6).

In low voltage network, commonly found no fuse switch, mostly is Air Circuit breaker,which name "ACB" in abbreviation.

Worldwide Circuit breaker brand as "SCHNEIDER, LEGRAND, SIMENSE, MARATHON, ABB....''

switch off Composition of MCB:

one bi-metallic strip (provides protection against over load current)

one trip coil (an electromagnet provides protection against short-circuit current)

one hand operated on-off lever

Operating mechanism of miniature circuit breaker:

It has 3 positions'on''off' and 'tripped'. The external switching latch can be in the 'tripped'position, if the MCB is tripped due to over-current. When manually switch off the MCB, the switch latch will be in "off' position. In close condition of MCB, the switch is positioned at 'on'.

Miniature circuit breaker advantage comparing to fuse:

1. It automatically switches off the electric circuit during abnormal condition of the network means in over load condition as well as faulty condition. The fuse doen not sense but miniature circuit breaker does it in more reliable way.

2. Switch operating knob comes at its off position during tripping, the faulty zone of the electrical circuit can easily be indentified. But in case of fuse, fuse wire should be checked by opening fuse grip or cutout from fuse base, for confirming the blow of fuse wire.

3. Quick restoration of supply can not be possible in case of fuse as because fuses have to be rewirable or replaced for restoring the supply. But in the case of MCB, quick restoration is possible by just switching on operation.

4. Handling MCB is more electrically safe than fuse.

One disadvantage is MCB is costlier than fuse unit.

But the trends is more and more MCB replace fuse to achieve better and more safe working and life. Welcome to choose our coils winding machine for MCB coil.

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Remark:this article and photo is quote from www.electrical4u.com and www.electricaltechnology.org

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