The M series battery selector and cut off switch has a case design that allows for mounting on the surface, rear, or front mount. Studs accept 3/8” ring terminals. This switch is UL listed – UL 1107 electric power switch and meets UL 1500 and SAE J1171 Ignition protection requirements. It has a cranking rating of 10 seconds at 1500 amps, an intermittent rating of 5 minutes at 500 amps and a continuous rating of 300 amps. The 16-126 is for running two batteries that can be individually selected. The design allows for switching between the batteries with no interruptions.