Attwood 14230-3 Single Pole 4-Way Selector Marine Battery Switch 6-volt to 32-volt D. C. (direct current) systems 300 amps 6 volts / 150 amps 12 volts (Continuous) Automatic alternator field circuit disconnect to prevent surges and so, protect your valuable boat electronics Bakelite housing, copper washers, and solid brass terminals and nuts