I have read many posts here and on other sites about wire size and use of circuit breakers. Today I sent the following e-mail to KFI:
I am going to install a 3500 Stealth Winch in my Pioneer 500 Is there any overcurrent protection device in the contactor or the winch itself?
Is a fuse/breaker required to protect the wire from the battery to the contactor/relay? If so, what size?
After reading many on-line posts it appears that the supplied cables may not be long enough. I am considering using welding cable from the battery to the contactor. The cables supplied appear to be 8 awg that seems very small for the maximum current draw of 230 amps. I realize that these are not continuous duty motors, but should I install 4 gauge to reduce voltage loss and heating of wire?
I look forward to your prompt response.
Within a couple of hours received their response:
We do not have a fuse/breaker in our system. You can add one into the system but if you used the winch intermittently like you're supposed to and check the motor heat you won't burn it up.
If you were going to put one on I would do a 100-120 amp that is also waterproof. Also I would keep the gauge of the wire the same.
It is not the response that I wanted. I was actually looking for "carved in stone" recommendations. I was impressed by their speed at responding to me.
I was going to try the same question to WARN, but they list no email address for technical support. I'll wait for their west coast offices to open to phone them. If I get any information from them I'll pass it on.
ADDITIONAL INFORMATION:
I just phoned WARN and spoke with Russell in their technical department. He said that their 3500 lb winches come with #6 wire and if adding only a couple of additional feet there is no need to increase size.
As far as fusing he agreed that there is no protection. He indicated that even their very large 600a winches run without protection and he has never heard of a problem associated with lack of overcurrent protection. He suggested that care should be taken with running the cable to ensure it is not subject to physical damage.