A compact, reliable battery isolator switch that prevents unwanted battery drain and makes it simple to disconnect power when a vehicle or equipment is not in use. Use the included key to quickly cut or restore the circuit and extend battery service life. Key benefits Prevents battery drain: reliably interrupts the circuit to stop quiescent power draw and avoid a dead battery. Simple to operate: turn the switch with the included key to disconnect or reconnect power in seconds. High load capacity: solid copper terminals with metal nuts/rivets handle continuous currents up to 100 A (DC 12 V) and surge currents up to 300 A. Weather resistant and durable: robust plastic, metal and rubber construction plus a waterproof keyhole cover protect against moisture, dirt and corrosion for external mounting. Secure mounting: four reinforced mounting holes (Ø 5 mm) and M10 nut fastening ensure a stable installation. Features and specifications Function: manual battery isolator/main switch for interrupting DC battery supply. Electrical capacity: continuous current up to 100 A at DC 12 V; maximum surge current 300 A. Terminals: solid copper terminals with metal nuts/rivets for reliable conductivity and mechanical strength. Materials: durable plastic housing, metal hardware and rubber seals. Protection: included waterproof cover for the keyhole to reduce ingress of dirt and water. Mounting: 4 × Ø 5 mm reinforced holes; M10 nut type. Key shaft diameter: 10 mm. Key included for on/off operation. Compatibility: suitable for DC 6 V, 12 V and 24 V battery systems and compatible with conventionally designed round battery poles. Installation and use Can be mounted internally or externally thanks to robust weather protection. Installs using the M10 nut and a 10 mm key shaft; reinforced mounting holes provide a secure fit. Designed for round battery poles of conventional design; suitable for a wide range of vehicles and equipment. Practical applications Automotive and light commercial vehicles: isolate the battery during long storage periods to prevent drain from electronic standby systems. Marine and outdoor equipment: use as a shore power/battery cutoff on boats or trailers where exposure to moisture requires a waterproof keyhole cover. Construction and recreational vehicles: install on tractors, ATVs, RVs or work vehicles to protect batteries during storage or maintenance. What it solves Eliminates unexpected flat batteries caused by parasitic loads. Provides a straightforward, durable method to secure power during storage, transport or maintenance. Offers reliable current handling for accessory loads while protecting against environmental damage. Includes Battery isolator switch (M10 nut type, key shaft 10 mm) with key and waterproof keyhole cover. Technical reminder Rated continuous current: 100 A (DC 12 V). Rated maximum current: 300 A. Mounting holes: 4 × Ø 5 mm. Compatible voltages: DC 6 V, 12 V, 24 V.