Siemens / ITE KL3B400 – 400A 3 Pole Molded Case Circuit Breaker Certified

Engineered for heavy-duty applications, the Siemens KL3B400 serves as a 3-pole, 400A molded case circuit breaker. It delivers robust thermal-magnetic protection with an interchangeable trip unit, making it ideal for industrial power systems. This bolt-on breaker is an exact replacement for legacy ITE panelboards, including the CDP-7 and FC-I. Using this match avoids the complex retrofit kits required for the newer JXD63B400 model. It delivers a 42 kAIC rating at 240VAC and is HACR rated.