40 amp marine circuit breaker; Operating Voltage: 12V - 48V DC; Waterproof; Ignition Protected according to SAE J1625, J1171, and UL1500 standards. Reusable and Controllable: The 12v circuit breaker can be manually turned off by pressing a button and reset by pushing the reset bar back for reuse. Function: The dc circuit breaker automatically cuts off the circuit when the current exceeds the set value to protect your vehicles or boats from electrical damage. It also allows users to manually open or reconnect the circuit as needed, which facilitates troubleshooting. Surface Mount: This inline circuit breaker switch is surface mount design, which makes the reset or replacement of the 12 volt circuit breaker much quicker and easier. In addition, these 40A circuit breaker will also come with suitable mounting screws to make the installation much more convenient. Application: This fuse circuit breaker is capable of both automotive and marine use, suitable for automotive, car, RV, truck, boat, etc. Manual Reset Auto Circuit Breaker SPEC: Voltage: DC 12V - 48V (MAX) Model: 40A Circuit Breaker Operating Temperature: -32℃(-25℉) - 82℃(180℉) Mounting Type: Surface Mount Termination: 1/4inch Stainless Steel Studs Size: 2.9inch x 1.9inch x 1.9inch (L x W x H) Color: As Shown Material: plastic Package Contents: 2 set * 40 Amp Circuit Breaker