Where to put winch isolation switch?

[zardos]

So you are saying that putting 500 amps through a solenoid design for that amperage has a higher chance of failure than putting 500 amps through a manual cutoff only rated at 100 amps. I would put my money on melting the 100 amp cutoff first.

Erm most solenoids used are not designed for 500Amps constant use.

For example the normal DC88 allbright is designed for only 100A at 100% duty cycle (but it can disconnect an 800A fault load)

This puts it on par with the smaller winch isolators, so it is better to use the bigger 250A 100% duty cycle ones as they are rated to 2500A for very short periods.