S: Our battery disconnect switches are constructed from brass and copper with tinned core and insulated ABS plastic. The tinning enhances the oxidation and discoloration resistance of red copper without compromising conductivity, providing extended rust protection. This power switch for car applications is designed to withstand harsh marine environments, ensuring safety and prolonged service life. HIGH SAFETY: Our battery disconnect switch is engineered for safety. When a vehicle or boat is not in use, it safely cuts off the power supply to the battery, preventing parasitic drain and preserving battery performance. WIDE APPLICATION: These waterproof battery isolator switches feature a compact and durable design, making them ideal for installation on cars, buses, RVs, SUVs, motorcycles, trucks, pickup trucks, yachts, and other vehicles. They can serve as reliable main battery switches across various applications. BATTERY SWITCH SPECIFICATIONS: Suitable for an intermittent current of up to 150 A and a continuous current of 100 A at a maximum of 32 VDC. Cranking power: 500 A for 5 seconds. Contact resistance: 50 mΩ. Insulation resistance: minimum 100 MΩ at 500 VDC. Bolt diameter: 6 mm. EASY TO USE: The battery isolator switch features clear markings indicating on and off positions. "On" indicates open circuit, "Off" indicates closed circuit. "OUT" indicates the cap can be pulled out to prevent the switch from being turned on. Simply rotate the knob as needed to achieve the desired switching state.