This is 12-48V DC Circuit Breaker has been designed to end the struggle of blowing fuses and hassle of having to buy and install more. A red arm will deploy when the circuit is tripped, then just simply reset the circuit. Mainly used for car audio and Amps protection and in trucks, boat, RVs , marine, buses ect; also used in battery charges and DC sound system. Works great for Solar systems, battery bank to solar charger. Power inverters.