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.
WD-1V-MCW
WD-1V-MCF
WD-1H-MCW
WD-1A-MCW
WD-1N-MCW
Remark:this article and photo is quote from www.electrical4u.com
and www.electricaltechnology.org
