Answer / rajendran m

Contactor is not tripping device

Breaker is tripping device

Answer / ajit

contactor use to make contact bitween two pointsof
sircet ,and in other hand breaker is a electrical divice
which is use for break thecontact point in a sircet.

Answer / suresh

both are circuit interupting devices. contactor is used for
interupting low currents and breaker is used to interrupt
high currents.

Answer / bala

contactor:
A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings.

circuit breaker:
A circuit breaker is an automatically operated electrical switch designed to protect an
electrical circuit from damage caused by overload or short circuit. Its basic function
is to detect a fault condition and, by interrupting continuity, to immediately discontinue
electrical flow......

so finally,contactor used for switching.......and circuit breaker is used for to protect a circuit.so that one is interrupt device.....

Answer / dinesh chaudhary

contactor is simply used to make the contacts between two
ckts of low rating while breaker works when relay commands
i.e. relay is used as a sensing device which sense the
abnormal condition & command to the ckt breaker to brek the
ckt.

Answer / vijay krishna rao

Yes both are tripping devices. But for breakers to trip,
relays send respective (frequency,voltage,current) signals
and accordingly trip based on the settings. Contactors trip
with no intentional time lag as soon as the voltage falls
below (may be 0.6-0.7 p.u), no signalling devices are used.

That's why one may have come across a situation, when there
is a grid fault and generator trips on auxillary motors
failure. As there (aux motors) are contactors present and
for a fault voltage drops, so contactors trip.

What are the three major categories of error?

0 Answers  

How to calculate the average power factor in 3 phase unbalanced system

5 Answers   Bhel, MacLellan,

How to Calculate the Fault Level of Electrical Installation

0 Answers  

what is the problem with single phase AC motors and how is it overcome?

2 Answers  

What is OLTC AND RTCC and it's function?

2 Answers   Sterling Wilson,

Why soda is added with water in Lrs of Sliipring motor…to Increase or decrease resistance of water?

1 Answers  

What is mean by Sub Synchronous Resonance(SSR)???

1 Answers  

Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?

0 Answers   Jindal,

i am using star-delta connections with reverse/forward direction motion of the 75hp induction motor.What should be the ratings of Main,Delta and Star contactors and why?

1 Answers  

How to select cable the size, what is the parameters use and what is the formulas use for this cable size calculation?

0 Answers  

how does this job compare with others you have aplied for?

0 Answers  

give me list of material for wiring of 20hp motor?

2 Answers   Alchemist,