Blue Sea Systems M-Series On-Off Battery Switch - Switches a single battery to a single load group Ignition protected—safe for installation aboard gasoline powered boats Case design allows surface, front panel, or rear panel mounting Isolating cover with snap-on sections protects rear contacts Stud Size: 3/8in Switch Type Single Circuit: ON-OFF Battery Combine: No Alternator Field Disconnect: No Maximum Voltage: 48V DC Cranking Rating: 30 sec 900A Intermittent Rating: 500A (5 min)