Description: Made of good quality material alloy, it has a good performance for durability and conductivity. Protect electrical appliances from excessive current, it is waterproof, temperature, and pressure resistant. Easy to operate by the manual reset arm, or push-button reset can also be used as a kill switch. Just press the button, and the circuit will close or open. Directly replace and easy to install. Universal product. Widely applied to most cars, video, audio amplifiers, and so on. Specification: Material: Alloy Color: Black Amperage: 30A Voltage: DC 12-48V Hole Diameter: 8mm / 0.31'' Sleeve Inner Diameter: 5mm / 0.2'' Installation Hole Diameter: 4mm / 0.16" Size: 100x43x43mm / 3.94"x1.69"x1.69"(L*W*H) Note: They can be mounted on the circuit of the vehicle-mounted speaker or other. Don't need to disassemble or install insurance core while breaking down. You just need to switch on or off the device. Package Include:1 x Reset Circuit Breaker