Siemens JXD23B400L – 400A 3 Pole Molded Case Circuit Breaker Top Pick

Designed for standalone enclosures and switchgear, the JXD23B400L is a unit-mount molded case breaker from the Siemens Sentron family. This 3-pole, 400A device includes factory-installed line and load lugs accepting up to 500 kcmil wire. It utilizes a non-interchangeable thermal-magnetic trip unit with adjustable instantaneous settings. Delivering a 65kA interrupting capacity at 240VAC, it replaces the discontinued JD63B400L model.