Answer / kashif ghulam mohammad

The function of relay and contactor is that to ON or OFF
contacts when we give voltage coil of both devices but main
difference is that relay does not use maximum 5 amperes and
magnetic contactor can be see in more than 50 or 60
amperes. and I also wanted to mention it that relay is used
only in controlling circuit and contactor are used both in
controlling and power circuit......

Answer / chris w

a contactor has bigger contacts than a relay. contactors are used for higher amps. They operate the same.

Answer / abdoulkarimubahizi

what are contactors and relay?how do they work?and what their application?in an electrical installation

Answer / gokulnath

For single phase (single output) connection we can employ relay.
For 3 phase connection ( multiple outputs) , we can employ contactors.

Answer / francesco

The word relay comes from very old times and was used to call a set of horses that pull a car, when a relay of horses got tired they switch it for a fresh one. In electricity the use of a relay is the same, you use a relay to switch between loads or between sources, You have one terminal with two possibilities, in a NC relay if not powered you're using one contact and when the relay is powered you use the other, or backwards if the relay is a NO. A contactor only has one in and one out so in a NO contactor when not energized the contacts are open and when energized the contacts are closed or backwards if the contactors is NC.
So relay has one in and two out possibilities, contactor has one in one out.

Answer / undala vijay bhaskar reddy

relay is sence the fault and give the trip sigal to the
circuit breaker.
contactor is a electro magnetic device.it is control the
circuit

Answer / miriam

contactors has hold on contact while relays does not

Answer / r. vidhya

contactor cannot receive high current or high voltage while relay can receive

Answer / sheik abdulla

The contactor serves the purpose of switching where as the relay give the signal.

Answer / a.narayanan.

RELAY IS AN ELECTRONIC OR ELECTRO MECHANIC DEVICE.IT CAN
OPERATE NORMAL OR ABNORMAL CONDITION TO TRIP THE C.B UNDER
PRESET VALUES IN ITSELF.

BUT CONTACTOR OPERATION NOT LIKE RELAY OPERATION.
IT CAN OPERATE ONLY BY CONTROL VOLTAGE IN SOME OF THE CIRCUIT.

Which oil is used in Transformer?

6 Answers  

what is the meaning of knee point in current transformer and how to calculate?

2 Answers  

why capacitor bank is not used in generator power

7 Answers   Caterpillar,

what is meant by negative conductor?

2 Answers  

How line capacitance & line inductance varies with increase in height tower.

0 Answers  

what is the purpose of silicon dropper used in battery charger?

0 Answers   KNPC,

what is meant by differential protection of transformer

1 Answers  

how to find the starting current of the motor?

1 Answers   BOC,

what do you mean by leading power factor & lagging power factor

13 Answers   Suzlon,

What are the different protection systems takes place on control panel board?

7 Answers   BSNL,

what is the difference between delta delta and star delta connection transformer? why we use delta delta transformer since it need earthing transformer for grounding?

0 Answers  

why HT motors are earthed only at equipment side & for it's single core cable with aluminium wire armoure using?

1 Answers   Legrand, NLC Neyveli Lignite Corporation Limited,