Quote:
Originally Posted by Bill.Cross
I'm not absolutely certain about this but my guess is that the wattage rating of the relay just tells you how much power it is capable of passing. My thinking is that if you ask a 10 watt relay to pass 20 watts it will burn out but if you use a 20 watt relay for 10 watts you are just using a more costly and bigger peice of kit than you need but it will still work. It's just a switch.
I think.
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Correct to a point. If you push too much through a relay, excessively, it will pop, which will mean that the NC circuit will remain closed, and the NO one will remain open, regardless of what voltage/current you supply the relay.
I thought about posting this before, but decided against it due to the thread being a very old one. 12v 10w relays are used in some scooters, particularly vespa's. Should anyone need one, they would be a good place to start looking.