Manual reset ATC circuit breakers are type 3 circuit breakers - Fits into a standard ATC or ATO fuse socket. Manual reset breakers have a button that pops out when the circuit breaker trips. You need to press this button back in to reset the circuit breaker. Provides the most secure circuit protection, but requires access to the circuit breaker in order to reset it. Manual reset ATC circuit breakers can provide circuit protection in both 12 volt and 24 volt electrical systems.