This is a Circuit Breaker manufactured by Eaton. It is a type D2ABXA1223 dual pole, 100 Amp, 120/240 Volt AC, molded case circuit breaker. It meets UL 489 requirements. It has 120/240 Volt AC, 100 Amp rated current, 10,000 AIC interrupting capacity, and HACR rated. It has button reset, normally open trip mechanism, and is rated for use with copper or aluminum wiring.