Join Date: Feb 2000
Location: Temple City, Ca
Re: Why use a relay on a dual elec fan?
Basically you are using the large switch contacts, inside the relay, to operate the fan.
If you just used a switch you would have to use one with very large contacts. Just like your large wire.
It's impractical to run large gage wires inside the car to the switch.
Much easier and cheaper to use a smaller switch and smaller wires to the switch.
The relay coil can close the large relay contacts but the relay coil doesn't draw much current, thus the smaller switch.
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