Westinghouse KB3250F Shunt Trip Circuit Breaker

The Westinghouse KB3250F Shunt Trip Circuit Breaker provides 125 A trip protection in a 3-pole, 600 VAC molded‑case breaker designed for fixed mounting in commercial and industrial power distribution. Part of the KB series, it employs a thermal‑magnetic trip and includes a shunt‑trip accessory for remote shutdown in switchgear, panelboards, motor control centers, and industrial panels. With a 250 A frame rating and a 3‑pole configuration, it is intended for high‑capacity three‑phase circuits and equipment protection, delivering reliable overcurrent and short‑circuit protection along with remote tripping capability. This panel‑mounted device is compatible with switchgear and distribution systems and supports applications in manufacturing facilities, industrial automation, HVAC equipment, emergency shutdown systems, and general power distribution. Common replacements include Eaton KB3250F, Cutler‑Hammer KB3250F, and Square D KA36125.