Answer / rajesh

During faults (short-circuits), fault currents have two
components- AC component (Periodic) and DC Component
(Aperiodic). DC component will be decayed as per system X/R
ratio. circuit breakers are manufactured and tested to
break the fault current of specific AC component (Ib) and
DC component(Idc). Together can be called as Asymmetrical
breaking current.

Answer / vasu

DC component in circuit breaker is not related with trip
circuit system, it is related with making or breaking the
circuit at fault condition.

Answer / prathees

In a circuit breaker, always the trip circuit is DC. And it
is powerd by some battery back-ups or ups.
Because, even is the total power to the substation is gone
by some problems or faults, the trip circuit can be
operated without any problem as it is the safety for all.

Answer / ramesh.k

In circuit breakers having trip and close coils are purely
dc components, some CB's are having antipumping coils also
pure dc components and spring charge motor used as both ac
and dc.

Answer / deepak kumar

In CB basicaly on HVCB DC ckt is used for their protection
ckt (making/breakin) and indication ckt as well as for
auxilary ckt like antipumping/hunting ,PD,

Answer / murugavel

dc closing coil,spring chargingmotor,tripping coil, andi
pumpingcontactor

Answer / amit mathur

The closing coil and the tripping coil with dc to dc
convertor for appropriate operation.

Answer / arunmozhi

circuit breaker in closing coil and tripping coil worked
for DC voltage.spring charge only used for 220v AC voltage.

Answer / sunita

in circuit bkr. only closeing and triping coil is a DC
component spring chargeing motor is generally AC motor

Answer / nilkanth

In circuit brekar motor used for spring charging is DC
motor 110v DC.

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