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Product DescriptionFeaturing a make-before-break design, this Perko switch permits selection between two batteries for starting and charging or operation of both batteries in parallel. The "off" position also acts as an emergency disconnect in the event of an electrical problem. For use with systems under 50 volts. Rated 250 amps continuous, 360 amps intermittent. 5-1/4" dia. x 2-5/8"H.