Hello, how
are you in this winter season,
In my
previous post I have discussed on different types of switches, today I am going
to discuss on a special type of switch as well as a protective device (circuit
breaker)
The name of
this device is MCB(Miniature
circuit breaker)
Why should
we use a MCB in a circuit and why nit a normal fuse?
In case of
general purpose switch ,if the fuse wire burns out, we need to open the fuse
from the panel board and make it again,
But if we
use a MCB we don’t need to do this,
We should
use a MCB in general for three common purpose 1.short circuit protection 2.overload
protection 3. As a hand operated on/off
switch
Main parts
of a MCB-
1.a bimetallic
strip, 2.a trip coil, 3.hand operated switch
How it
works- it is interfaced in series with the load, if there is a fault in the
load like the load is short-circuited of drawing more current than the rated
value of current of MCB, the bimetallic plate gets hotter and bents and make
the circuit disconnected, at first current enters through the input terminal
then passes through the bi-metalic plate then the trip coil flowing through the
moving contact and fixed contact it reaches the output terminal. If more
current than the rated value flows through the circuit or in the time of short
circuit the trip coil induces such amount of mmf that is enough to heat the
latch point making the latch displaced ,
Spark is
generated during the movement of moving contact on the fixed contact, to suppress
the spark a spark split is placed inside the MCB,
In my next
post I will show ,how to interface a MCB in house wiring,
Thank you
for reading ,
Good night,
have a sweet dream
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