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What is the difference between Relay and Contactor
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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 |
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