I like Blueseas products:
https://www.bluesea.com/products/6006/m-Series_Mini_On-Off_Battery_Switch_with__Knob_-_RedThicker longer studs, higher continuous amp rating and smaller physical size than my previous 'guest' brand switch which wore out and got hot passing 50 amps.
As long as the starting battery is not switched off with the engine running, turning off the house bank from alternator current 'should' not present an alternator load dump situation and fry it, but I'd wait for Mexwanderer to confirm this.
