Answer / sanjay n

Relay is a electromechanical switch which requires AC/DC
supply to operate it.By giving the reqired supply the coil
get magnetised and it makes or breaks the contact.

Answer / ravindra reddy

Relay will operate when is there any fault occurs on ckt the
fault information will send to circuit breaker and trip
it.so finally the circuit will protected.

Answer / lrankin

A relay is an electro-mechanical device which is used as
switch. The control side has a coil which when energized
(with the rated current) will produce a magnetic field
which will attract an electronic arm to a contact which
will then allow the relay to turn on a device such as a
lamp.
An AC relay works the same way with one difference.
Another coil is used along with the normal coil used in a
relay to supply some opposition when the coil is seeing the
voltage go negative. Since it holds it's magnetic charge
long enough to oppose the turn off of the main coil, the
relay will stay engaged and not chatter.

Queensborough Community College All The Way!!!

Answer / j.santoshramanakumar

sorry still studied about switchgears so i thought it is a
switch

Answer / a

U both are wrong i m correct

Answer / j.santosh ramana kumar

relays are the switches like dpst,dpdt etc

if single phase is having 220v supply then why three phase is having 440v instead of 660v?

4 Answers   C&S, NTPC,

Explain why the Voltage drop will happen in 3 Phase line?

2 Answers  

what is the difference between oil surge relay and buchholz relay.

0 Answers   MPPEB, Suparco,

What is industrial automation ??????

5 Answers  

One 15kw motor Why we used star delta feeder?why not used DOL please explain in details

3 Answers   BMM Ispat, GSK, Pitti Laminations,

different types of electrical cable?

1 Answers   Green Power,

why we are using DC violtage for testing of cables....which is used in HV AC applicatons...

1 Answers  

what time should we set to come on star contacter in stardelta starter?and for what reason we hav to set such time delay range?

2 Answers  

can we connect 2.2kw star motor in delta passion?

1 Answers   Zuari,

what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

0 Answers  

what is the full form of XLPE adn there use.

4 Answers   Voltas,

How to Convert horsepower to kva? what is the three phase formula? email me if u know thanks Rehan smileavail@msn.com

3 Answers