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honestly i wouldn't use either, fuse protect it at a spot that you can get at remote from the switch. cole-hersee has those also, its what i have in my car.
and there isn't a relay per-se, its more of a thermal switch. you could install a separate relay to remove the load from the switch. the initial turning on of the switch is when the fuse probably lets go from the load. so a relay may prevent it from happening again
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Fred B
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