1 piece 40A 12V DC circuit breaker cover designed for dual battery systems, providing reliable protection for electrical circuits. Key benefits - Protects dual battery circuits with a 40A 12V DC rating, helping prevent damage from overloads. - Automatic auto reset function quickly restores power after a fault, minimizing downtime and maintaining operation. - Waterproof construction suitable for outdoor or humid environments, reducing the risk of water damage. - Specifically made for 12V DC applications, aligning with common automotive, marine, and off-grid setups. - Simple to install and compatible with standard 12V DC circuits in dual battery configurations. Why you need it - Keeps your critical 12V circuits safe in dual battery systems by automatically resetting after an overload. - Reduces maintenance and downtime by restoring power without manual intervention. - Built to withstand wet or exposed locations, increasing reliability in harsh environments. 2-3 practical use scenarios - RV or camper van with a dual battery setup to power lighting, the water pump, and charging devices while camping. - Boat or marine installation protecting the house and engine battery circuits in a damp or splashing environment. - Off-grid cabin or solar-powered system with a dual battery bank, ensuring essential loads stay powered after a fault clears. Specifications at a glance - Quantity: 1 piece - Current rating: 40A - Voltage: 12V DC - Application: dual battery systems and 12V DC circuits - Function: automatic reset after fault; waterproof design Notes - Please confirm fitment for your specific dual battery configuration and circuit layout prior to installation. This product is designed to cover and protect a 40A 12V DC circuit in dual battery setups.