I ran across this while looking for something else. I had never heard of these, but they appear to be the perfect solution for putting a disconnect in a dedicated engine generator to battery line. We have discussed this several times in relation to the turn on and turn off spikes you can get from connecting or disconnecting from a spinning alternator, so losing battery reference. Very easy solution to the problem, it appears.
https://www.bluesea.com/resources/91
Battery disconnect for engine generator setups
Linear Mode
