The Eaton Cutler-Hammer FDB3040BU is a three-phase molded-case circuit breaker rated for 40 amperes and up to 600 volts, configured as a 3-pole device for 3‑phase protection. Designed to interrupt and protect three-phase electrical circuits, this MCCB serves to provide overcurrent protection in distribution panels and feeders within commercial and industrial power systems. The FDB3040BU designation identifies a 40A, 600V, 3P MCCB in Eaton's Cutler-Hammer product family.
