For use with 2 or more batteries and single or dual engine systems. They permit selection between batteries for starting and charging or operation of both batteries in parallel. for use with systems under 50-Volt. Use 2 switches for dual engine systems. When used with Non-Unitized Alternators, these models will interrupt the field current (reducing the possibility of damage) if turned in. OFF in. with the engine running. Capacity: 250 Amp continuous, 360 Amp Intermittent. Dimensions: 5-1/2 in. Dia., 2-5/8 in. D.