Schneider Electric EHB34040 Molded Case Circuit Breaker

Schneider Electric's Square D EHB34040 is a three‑pole molded‑case circuit breaker (MCCB) designed for commercial and light industrial power distribution. It protects 40 A, 277/480 VAC three‑phase circuits with a thermal‑magnetic trip that provides both reliable overload protection and instantaneous short‑circuit response. The unit uses bolt‑on mounting and accepts aluminum or copper conductors up to 14 AWG in its lug terminals. With a rated interrupting capacity of 14 kA at 480 VAC (and 277/480 VAC compatibility), the EHB34040 is built on the EHB frame for use in panelboards and switchgear that require compact, dependable overcurrent protection. The device is specified for a 40°C ambient environment, ensuring robust operation in typical indoor installations. As part of Schneider Electric’s Square D line, this MCCB is suited for protecting feeders and branches in 3‑phase distribution systems where coordinated protection with other circuit breakers in the same family is important.