Jag
Living Legend
The in-rush current as the compressor starts up is probably more than 20 amps and then it'd stabilise at 20 amps while running. That would trip a 20 amp circuit breaker but probably not blow a 20 amp fuse.
30 amp fuse is fine as it's really only to protect if something shorts out and that'll draw over 30 amps anyway.
You are correct!! So I used the appropriate sized wire, fuse holder and fuse, just Incase. The PDM still worked without the relay and programmed for a ground trigger but would trip after 1 second then reset automatically. The electronic fuse is more sensitive than a fuse. The directions from the manufacturer says to use a 30amp fuse but an update on their website said 20 is fine.