Square D by Schneider Electric EDB14040 is a 277 V AC, single-pole bolt-on miniature circuit breaker rated at 40 A, designed for E-frame panelboards and feeders in commercial electrical systems. It offers an 18 kA interrupting rating (18 kAIC) and typically accepts #12–#14 AWG copper or aluminum conductors depending on lug configuration. This 1-pole device protects a single-phase branch circuit operating up to 277 V, and its bolt-on design enables straightforward installation in compatible enclosures, making it suitable for 277 V lighting and other commercial circuits.
