Cole Hersee battery selector M-0752

Cole Hersee, Battery Selector Switch, 6-36V, 4 Positions. With alternator field disconnect.
Plastic Knob, Inrush rating (2 seconds) 500A, Contacts: Copper. Max total continuous current: 310A.
These switches combine the functions of Battery Selector and Master Disconnect Switches to give four battery power options:
Power cut off at the source, Power On Batterry 2.
Power On Battery 1, Power On both Batteries.