Features: 1.Circuit breakers with a manual reset switch, specially fits for auxiliary DC electrical systems. 2.Provides current overload and short circuit protection, able to use in harsh environments, like motorsport. 3.Protective rubber caps can avoid unnecessary short circuits. Waterproof unit with good sealing, suitable for use in engine compartments and Bilge area's. 4.The manual trip switch can quickly disconnect the circuit in an emergency. 5.Switchable surface mount circuit breakers are suitable for auxiliary and accessory circuits in trucks, buses, RVs and marine systems. 6.The size of the connecting stud is M6 x 2, and the nut is equipped with an integral lock washers to prevent loosening caused by vibration. Specification: Condition: 100% Brand New Item Type: AMP Circuit Breaker Material: PC Housing Material: Thermal Plastic Color: Black+Red Size: Approx. 74 x 45 x 49mm/2.9 x 1.8 x 1.9in Circuit Rating: 50A Voltage Rating: 12-48V DC Interrupt Rating: 3000A at 30V DC Operating Temperature: -32C - 82C Storage Temperature: -34C - 149C Number of Poles: 2 Weatherproof Rating: IP 67 UL Rated: 94V0 Way of Working: 1. Circuit break protection: When the current reaches the cut-off value, the long handle automatically bounces and cuts off the power supply. Generally, it trips in a short circuit condition. After the fault is eliminated, press the long handle back to the original position to form a path. 2. Manually power cut off : We need to disconnect the circuit when refitting, and directly press the oval red button on the insurance. At this time, the long handle automatically pops up to cut off the power. Connect as above, then press the long handle back to its original position.