Siemens CLE63B040 Three Phase Circuit Breaker

The Siemens CLE63B040 is a three-pole molded-case circuit breaker (MCCB) in the CLE family, providing overcurrent protection for three-phase electrical circuits with a 40 A nominal rating and intended for installation in commercial and industrial distribution gear. The device is rated for up to 600 V AC and can interrupt fault currents up to 200 kA at 480 V, enabling safe disconnection of faults in many industrial layouts while meeting common protection requirements. In practice, this model is selected when a durable, field-replaceable protective device is needed for three-phase loads such as feeders and motors, offering straightforward integration into Siemens and legacy ITE systems that use CLE-type MCCBs.