Siemens JD3B300 – 300A 3 Pole Molded Case Circuit Breaker Best Seller

Providing robust 300A protection, the Siemens JD3B300 is a 3-pole molded case circuit breaker designed for industrial applications. It features an interchangeable thermal-magnetic trip unit with fixed thermal and adjustable magnetic functions. This unit mount breaker is compatible with Siemens Sentron P4 and P5 panelboards, motor control centers, and switchboards. It is a legacy component replaced by the JD63B300. The JD frame MCCB offers a 65kAIC rating at 240VAC and is fully HACR rated.