Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect One Size. Heavy Duty Battery Switch Ignition Protected For use with 6 12 24 and 32 volt marine electrical systems capacity - rated 380 amps continuous 850 amps intermittent (5 mins on 5 mins off) Heavy Duty Battery Selector Switch w/ Alternator Field Disconnect Specifications for Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect: Manufacturer: Perko Amperage: 380 amps Color: Black Features of Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect AFD: Yes Lockable: No Positions: 2 Continuous Amperage: 380 Package Contents: Perko Heavy Duty Battery Selector Switch w/Alternator Field Disconnect Perko 8603DP: Heavy Duty Battery Selector Switch w/Alternator Field Disconnect One Size