Bussmann ATC thermal Circuit Breaker - Manual Reset - 20 Amp - Type 3 manual reset thermal non-cycling circuit breakers will remain tripped until the operator resets them by pushing a button located on the breaker. Circuit breaker housing is gray plastic with silver cover. Amperage and voltage ratings are stamped on the cover. Meets SAE J553 specifications for type 3 circuit breakers. Can replace fuses in most applications.