NOCO SW5400S 210 Amp Heavy-Duty Marine Grade Battery Disconnect Switch Heavy duty marine grade battery disconnect switch; rated for use with 6 volts to 24 volts battery systems, and 210 amperes continuous and 600 amperes intermittent Battery main disconnect; completely cuts off power to the batteries by turning off the key to protect against unwanted battery drain, and electrical fire Removable key; a removable security key protects against unauthorized use of any vehicle Rugged design; made from a durable engineered polymer for resistance to corrosion, gas, oil, and other contaminants Optimal performance; features 3/8 inch tin plated battery studs for maximum conductivity and corrosion resistance