Westinghouse DK3400W Molded Case Circuit Breaker

The Westinghouse DK3400W Molded Case Circuit Breaker is a 400 Amp, 240 Volt, 3‑pole device engineered for industrial power distribution and motor control systems, delivering thermal‑magnetic overload and short‑circuit protection to high‑current circuits. It is commonly installed in industrial panels, motor control centers, manufacturing equipment, and three‑phase distribution networks that require dependable interruption and stable operation, reliably interrupting fault currents to prevent damage to downstream equipment in harsh production environments. With three‑phase configuration and panelboard mounting, this breaker protects branch and feeder circuits across applications such as manufacturing facilities, HVAC systems, conveyors, and other equipment where continuous operation is critical, and it is built with an industrial‑duty housing designed for long‑term use. Common replacements include Eaton DK Series, Siemens Industrial Circuit Breaker, and Square D PowerPact, underscoring its role in upgrading aging industrial power distribution gear while maintaining compatible three‑phase protection.