300 Ampere continuous rating for outboards and small gasoline or diesel engines. 1-piece tin-plated copper stud design never loosens over time. Terminal studs accept 3/8 in. or M10 ring terminals. Features isolation cover with 3 removable sides. Ignition protected and UL Listed. Rated for 300 Amp continuous, 500 intermittent, 1500 cranking. 2-7/8 in. x 2-7/8 in. Selector 3 Position - Switches isolated battery banks to all loads. Selector 4 Position - Switches isolated battery banks to all loads or combines battery banks to all loads.