Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between Relay and Contactor
- 35 Answers
- 159154 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / sandeep
Contactor is a switching device. Unless & until you give
command it wont operate. Contactor is not a sensing device.
on the other hand Relay is the device which sense the
ubnormality & give command accordingly. Relay differentiate
normal & ubnormal condition which contactor can not.
In short if only contactor is connected in circuit.. in
case of ubnormal like OV or OC it will burn.. but if it is
connectedin coordination with relay.. relay will sense the
fault & give signal or command to contactor to trip
| Is This Answer Correct ? | 212 Yes | 90 No |
Post New Answer View All Answers
How a band pass filter is constructed?
Why wind turbines wheels rotate constantly
What is the lifetime of a Thyristor? Is there a recommended lifetime for thyristors after which they should be replaced?
The synchronous machine excitation system explain
Define phase cross over?
Could you measure voltage in series?
do we use links in a dc circuit?if so what s its use in it?
do you have some of interview Questions in power and genrator section in general whith answers
What are the different types of transformers?
calculate external resistance values to add to the rotor of a slip ring induction motor. STATOR- 415 V, 3 phase delta, 1100 A, 50 Hz, 1490 rpm, pf 0,86 ROTOR - 660 V, 590 A, 50 Hz. STATOR current at each steps STEP1-600A,STEP2- 800A,STEP3-1000A,STEP4-1100A.
why can we use cosine wave instead of sine in ac supply as both have same rms vale and ripple factor
what about GD square and its important for motor design?
Sir,In our company there are 3 caterpillar make(capacity:(1) 3.3KV,2.5MW(2)3.3KV,2.5MW & (3)3.3KV,1.9MW) & 1 deutz make (capacity:11KV,3.8MW)gas engines utilised,all are running in paralell. There are three transformer utilised,(1) 6.25MVA,3.3KV/22KV,Impedence voltage:6.7% used for two generator,both are 2.5MW(2)5.5MVA,3.3KV/22KV,Impedence voltage:7.2% used for one generator of 2.5MW & (3) 5.5MVA,11KV/22KV,Impedence voltage:7.8% used for one generator of 2.5MW.all generator breakers capacity of 1250Amps. Sir,I want the details of fault level calculation of generator,transformer individually & for whole system. If you require any information from me.feel free for contact me sir.pl.send the answer of my question as the earliest as possible.
Why does the Solid state Rectifiers for 3-ph brake motors sometimes have 2 & sometimes 3 output terminals?
As a electrical engineer.. what are the basic norms should follow in transformer oil testing.. 1.What is the Electrode type? 2.How long time you will give for oil testing?
