The UL 489 Miniature Molded Case Circuit Breakers are designed for AC and DC applications, with a 17.5mm width and thermal magnetic properties. They come with accessories like an auxiliary contact, alarm switch, shunt trip, neutral pole, touch protection caps, cooling spacer, mounting screw, and lock-out adapter. The Undervoltage Trip does not have UL certification. These breakers are HACR Type 40°C and feature Line/Load reversibility for added convenience.