Permits current to be carried by either of 2 batteries, by 2 batteries simultaneously or cuts off all current at source. Ignition protected. Plastic case, knob and insulator. Four positions: OFF, ON-#1 Battery, ON-both batteries, and ON-#2 battery.

• Rating 6-36V DC; 310A Continuous, 500A intermittent 
• 3/8" copper studs 
• Size 6" flange diameter , Overall Height 2-5/8" 

Installation surface mount or install through a panel with a 3-5/16" dia. hole
UL Listed. Marine UL Listed