50A Master Battery SwitchFeatures:. Master Switch for + or - circuit. Seawaterproof. Type of protection IPX 4 (DIN 40 050) - 12V Max. 1000A(10s) / 24V Max. 500A (10s). Helps prevent theft and unauthorized use of boat. Reduces danger of fire/explosion. Makes electrical work easier. Specifications:. Box Dimensions: 1"H x 3"W x 8"L WT: 0.5 lbs. UPC: 760687871811