Key benefits Prevents battery drain and accidental discharge by providing a simple, reliable way to isolate the battery. Protects batteries from leakage and slow discharge when vehicles or equipment are stored, extending battery life and reducing maintenance. Heavy-duty 275 A rated contact and wide 12 V–48 V compatibility fit a broad range of vehicles and systems. What it does and why you need it Battery main switch that isolates the negative circuit to stop parasitic drain and make safe long-term storage or maintenance possible. Useful for theft deterrence, circuit isolation during service, and preventing battery damage from extended idle periods. Main features Voltage compatibility: Works with 12 V to 48 V systems. Current rating: 275 A continuous rated current for heavy loads. Leakage protection: On/off operation can be used at any time to prevent battery exhaustion and leakage, preserving battery capacity. Materials: Constructed from flame-retardant nylon and ABS plastic for heat resistance; fitted with copper connectors and stainless steel screws and nuts for strong conductivity and excellent corrosion resistance. Ease of use: Clear ON/OFF markings for quick identification. Designed for direct connection to the upper negative poles without requiring additional cables or connections. Performance and reliability Durable corrosion-resistant hardware and robust plastics provide long service life in automotive, marine, and off-road environments. 275 A rating supports high-current starts and accessories while maintaining safe isolation when switched off. Typical applications Passenger cars, light trucks and off-road vehicles: isolate the battery during long storage or maintenance. RVs and camper vans: prevent parasitic drain from appliances and electronics when parked for extended periods. Boats and small marine craft: isolate shore power or onboard loads to avoid battery over-discharge during layup. Quick installation tips Mount in a dry, accessible location near the battery negative terminal. Connect directly to the upper negative poles as labeled; no extra cabling required. Confirm system voltage (12–48 V) and that continuous current demands do not exceed 275 A. Specifications (as provided) Voltage range: 12 V–48 V Rated current: 275 A Housing: flame-retardant nylon and ABS Contacts/connectors: copper Fasteners: stainless steel screws and nuts Reliable, easy-to-use battery isolation and leakage protection for vehicles and small systems where clear on/off control, corrosion resistance, and a 275 A capacity are required.