1Function: Adopts make before break contact design to switch without power interruption, and switch two isolated battery banks or combines battery banks to all loads at the same time. 2Ignition Protection: Battery knob switch is designed for ignition protection, safe for installation aboard gasoline powered boats, 350A continuous rating for inboard gasoline or diesel engines. 3Tin Plated Copper Studs: Great conductivity, accepts up to 4/0 Awg battery cables, accepts 3/8in (M10) ring terminals, 7/8in (22mm) stud length accepts multiple cable terminals, one piece design is not easy to loose. 4Professional Design: Case design allows surface or rear panel mounting, tactile indicator conveys knob position by feel; IP66 rate waterproof can withstand water projected in powerful jets. 5Wide Application: The battery disconnect knob switch is a universal accessory with on off 2 positions, widely suitable for yachts RVs cars boats and much more to meet your various demands.