Westinghouse A201K4CA Three-Phase AC Contactor

The Westinghouse A201K4CA Model K three-phase AC contactor is an industrial-grade magnetic switch designed to reliably start, stop, and protect motors and power circuits in heavy-duty control environments. Built as a Size 4, 3-pole device, it handles up to 135 A and supports up to 100 HP, driven by a 110–120 V coil and rated for 50/60 Hz operation. Its magnetic actuation provides rapid switching for demanding loads while maintaining secure electrical contacts in motor starters and control panels. Mounting is suitable for panel or enclosure installation, enabling integration into motor control centers, automation equipment, HVAC systems, processing plants, conveyors, and pumps and compressors in industrial facilities. This contactor is a practical choice for industrial motor control systems where dependable switching and continuous equipment performance are essential. Common replacements for this configuration include Allen-Bradley 509 Size 4 Contactor, Siemens SIRIUS 3RT Series Contactor, and Eaton Freedom Size 4 Contactor.