Heavy Duty Battery Selector Switch Non-Locking For use with two or more batteries and single or dual engine systems. Permits selection between batteries for starting and charging, or operation of both batteries in parallel. For use in systems under 50 volts. Rated for 380 amps continuous, 850 amps intermittent (15 seconds on, 5 minutes off). For dual engines two switches are required. Perko #9603/DP