Ignition protected. For use with two or more batteries. For systems under 50 volts. Permits selection between batteries for starting and charging or operation of both in parallel. 250 Amps continuous/360 Amps intermittent. 3-7/8"W x 3-7/8" (9.84cm x 9.84cm). Depth: 1-7/8" (4.76cm).