Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between Relay and Contactor
- 35 Answers
- 159202 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / 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.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
I want formula to calculate current loss with distance in km.I searched many sites but didn't right answer.Plz reply me
A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?
At what speed an electric car can run with 2 HP motor of weighing 400 kg?
How to decide cable tray size?
how does the terminal voltage of transmission lines increase when a capacitor is connected???? This happens not only in transmission lines but also in all circuits. How??? When a capacitor is connected in a transmission line, capacitor also takes energy from the same supply. But how is it able to increase the terminal voltage??? Practically What sequence of events happen during increase in voltage???
Bimetal strip used in overload relay what is that,which types of material used for that & percentage.
how many types control panel of a 132/33 kv substation
what are the assumptions made in swineburne's test?
what is the significance of tan&delta and how it performed in power transformer
at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)
Can i use the B-curve MCB instead of C-curve MCB
what are the specifications we must look at to select a relay for any capacity motor?
Is it required to use Automatic transfer Switch in L&T panel board if we use AMF panel with DG set? How the single line diagram will be? Please forward the material to sreenu_207@yahoo.co.in
Power factor =1.000 at factory in supply. However, PF = 0.8 at motor end. Current = 100 Amp, Voltage = 400 V. What is the power distribution loss? Can I reduce it by adding capacitor at the load feeder?
what is package substation.how many types they have
