Function: This circuit breaker can protect the amplifier from being damaged by the over-load current or voltage. Meanwhile, the power supply can also be protected to avoid battery crack and explosion caused by short circuit. Specification: 150A, 12V-48V DC, compatible with all 12V/48VSystems. Use in place of an inline fuse holder and the unique push button reset can also be used as a Kill Switch. Effective: No need to replace the fuse -- save money. Suitable for car audio/video system, boat, trucks, buses, RV's, ATV winches, marine and DC sound amplifier system overload protection. Easy To Use: Manual Reset, just press on the button and the circuit will close/open.No need to disassemble the power cord and Screw terminals hold cables securely in place, can be mount on panel or firewall. Durable: Made of alloy materials, high tech water resistant housing, good conductivity, strong temperature and pressure resistance Size: 1004243mm Packing list: 1 circuit breaker (150A)