Professional Grade Siemens JK3B175 – 175A 3 Pole Molded Case Circuit Breaker

Built to support legacy infrastructure, this 175-amp molded case circuit breaker delivers essential thermal-magnetic protection for three-phase circuits. The bolt-on design fits seamlessly into Siemens SB1, SB2, and S5 switchboards, as well as P4 and P5 panelboards. With an interrupting capacity of 25kA at 240VAC and 14kA at 600VAC, it handles standard commercial fault levels. Facilities looking to upgrade can transition to the newer FXD63B175 substitute using an updated mounting strap kit.