- Compatibility and rating: 12V–48V operation, 275 A. Fits standard post batteries with conical post and conical collet diameters of 15 mm to 17 mm. Measure the negative terminal to confirm fit. - Build and durability: Brass terminals, nickel-plated iron nuts, flame-retardant PA66 body. Corrosion resistant and durable. At 48V, provides higher conductivity and safety for long-term use in harsh environments. - Installation and visibility: Direct connection on the negative terminal, no extra cables required. Clear switch status for easy insulation and protection; supports reliable energy management and prevents unnecessary power loss. - Waterproof design: Fully waterproof structure resists moisture and humidity. Prevents accidental disconnections and idle current drain in vehicles or boats; suitable for marine use, rain, and other humid environments. - Applications: Boats and yachts electrical systems; RV and camper van battery setups; Off-grid solar and backup power in harsh climates.