Material: The circuit breaker is made of alloy material, which has good conductivity, high temperature resistance and voltage resistance, and can be used for a long time. Waterproof case: The optional 30A-100A circuit breaker reset fuse holder with high-tech waterproof case can reduce unnecessary consumption and make it safer to use. Easy to Use: No need to replace expensive fuses, it just reset the system via a simple switch, and you'll be back to listening to your favorite music right away. Easy to use with manual reset arm. Function: Fuse holders prevent over-current and overload protection for amps, audio electronics, audio/video systems and car accessories , boats, marine vehicles and mopeds against surges from their amplifiers. Wide Application: Typically used in auxiliary circuits and accessories for trucks, buses, recreational vehicles and marine applications. Also used in battery charges and audio system.