Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between Relay and Contactor
- 35 Answers
- 159190 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / don
Answer #5 is the best one so far.
I think the question relates only to relays as switching
devices, not protective relays.
A "relay" is a solenoid operated switching device, having
one or more sets of change-over contacts, commonly used to
control (switch) other devices.
The contacts only "break" at one point.
A "contactor" is also a soleniod operated switching device,
but the contacts are discrete NO (normally open) or NC
(normally closed) contacts - not change-over. Contactors
are usually used to switch higher current power circuits
(as opposed to control circuits), such as motors and
lighting.
Contactors usually have three main poles which are fully
rated for its' AC3 rated current, and often a fourth
auxillary contact which is only rated at 10A AC1 - suitable
for control circuits only.
The contacts have a double-break - two points of break.
| Is This Answer Correct ? | 19 Yes | 8 No |
Post New Answer View All Answers
-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.
what kn of disc is used in 33kv,132kv,220kv,400kv,800kv transmission line
what is the difference between earthing and unearth
Is there a standard depth of gravel fill in Substation Switchyard? Please give a design/drawing. Thank you.
Why power factor should not be in leading (capacitive) mode of any load.
What is expention fastener (Fan)
How does HT work & Voltage required?
Explain what are inter-poles and why they are required in a dc machine.
i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.
WHAT IS LOAD CELL
How eddy current generation support the idea of train braking?
What is difference between mcb and mccb.
What is the range of the stator resistance of 3 phase induction motor?
sir please send me techinical questions for junior engineer posting in bangalore railway i am diploma holder
Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes.
