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Relay

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shermaine

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I have got some doubts.
What's the different between the coil rating and contact rating?
Are they the same?
PLease advise.
 
shermaine said:
I have got some doubts.
What's the different between the coil rating and contact rating?
Are they the same?
PLease advise.

No they are totally different - as the names suggest, one is the rating for the coil (that actually activates the relay, this is usually given as a voltage and a resistance - for example 12V 240 ohms). The other is the rating of the contacts, the actual switch which opens and closes as the relay is turned on and off - the ratings for this will give voltage and current, and usually for both Ac and DC - DC will have a far lower current rating.

A relay is simply a coil (electromagnet) that moves a pair of contacts (switch).
 
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