WirthCo 20314 Battery Doctor Battery Master Switch Excellent for marine or automotive use 100A continuous @ 12V, 50A continuous @ 24V 500A surge @ 12V, 250A surge @ 24V 2.25" dia x 2.5" deep (1.25" deep behind panel) Two .19" dia mounting holes Battery Doctor Battery Disconnect Stop-K Master Switch Key is removable in OFF position At 12-volt: 1,000 Amp surge, 100 Amp continuous At 24-volt: 500-amp surge, 50 Amp continuous With extra key, waterproof cap