1A4421 is a 110-125V Maximum Rating, 3 Pole, 40 amp circuit breaker made by Eaton. It features a thermal magnetic trip, is trip free, and has a 10,000A interrupt capacity. This breaker is UL and CSA listed, meeting UL489 and CSA C22.2 standards. It is also rated for use in 1-, 2-, and 3-Phase applications and has an NEMA type 1 enclosure. This breaker is suitable for use in residential and light commercial applications.