The Allen-Bradley 74A803 Magnetic Contactor Coil 120V is a replacement operating coil for Allen-Bradley size 4 contactors, designed to energize the magnetic core that pulls in the main contacts. This 120V AC coil is specified for 50 Hz and 60 Hz control environments, making it suitable for use in a wide range of industrial panels where a 120‑volt coil powers motor starters; when energized, it closes the contactor to supply power to the connected load. Marketed as a replacement coil for Allen-Bradley contactors, 74A803 is commonly offered as the 120V coil for size-4 starters, enabling maintenance and refurbishment of existing control panels without altering wiring.
