50 amps of Hi Power current protection in a compact package. When it comes to 12 volt Automotive circuit breakers, shortstop Breakers are a notch Above the Rest. And this one is no exception. When you're running 50 amps through a circuit, the last thing you want to deal with is a short to ground that could easily cause a fire. This breaker will prevent such a scenario. Attach the power wire from your battery to the Copper post labeled BAT, then connect the circuit you want to protect to the silver post labeled AUX. Now, if a short circuit happens, the circuit breaker will open it's electrical contacts interrupting the flow of current and shutting down the circuit. This bussmann breaker is a type 1 Auto reset breaker, so if the breaker trips, it will automatically reset itself after a short period of time. This allows the circuit breaker to be mounted in locations that are difficult to access since no access is needed to reset the breaker.