Cutler-Hammer EHD1040U Molded Case Circuit Breaker

The Cutler-Hammer EHD1040U is a molded case circuit breaker with a 40 A current rating and 277 V operating voltage in a single-pole (1P) configuration. Model EHD1040U identifies the device, which uses a compact molded-case construction designed for installation in electrical panels that house 277 V AC circuits. With a 40 A rating, the breaker is intended to interrupt current consistent with its nominal rating and provide overcurrent protection for the connected branch circuit. The 277 V voltage specification indicates suitability for circuits supplied at that voltage in appropriate commercial or industrial settings, where single-pole units are used to protect a single phase conductor. Identified as a Cutler-Hammer component, the EHD1040U aligns with the brand's molded case breaker lineup, offering a standard form factor and the expected reliability associated with this product family.