The Siemens EH3B040 U is a three-pole molded-case circuit breaker (MCCB) rated for 40 A at 480 V. It provides thermal-magnetic protection with separate long-time and instantaneous trip functions and is designed for bolt-on mounting with load-side lug terminals. The breaker offers a rated interrupting capacity of 14 kA at 480 V and is part of the EH Series. This model is listed as EH3B040 U; Siemens catalogs describe the EH3B040 as obsolete, though many distributors still stock it. It is suitable for protecting 3-phase circuits in 480 V distribution systems.
