Factory Price Siemens JJ63B400 – 400A 3 Pole Molded Case Circuit Breaker

Built for commercial applications, the Siemens JJ63B400 is a 3-pole, 400A molded case circuit breaker. It operates at up to 600VAC, delivering robust thermal-magnetic protection. This bolt-on unit installs into Siemens P4 and P5 panelboards or switchboards. As a legacy component, it serves as an exact replacement for older setups and is succeeded by the JXD63B400. Rated at 65kAIC at 240VAC, it features fixed thermal and adjustable magnetic trip settings, plus a HACR rating for HVAC equipment.