Allen-Bradley 509-BJD Magnetic Motor Controller

Allen-Bradley 509-BJD Magnetic Motor Controller is a Bulletin 509 direct-online starter designed for 3‑phase motors in fixed-speed service. The -4R variant comes in a weather‑resistant enclosure for outdoor or damp environments, while remaining a three‑pole magnetic starter intended for direct online operation. Coil voltage is 110/120 VAC, and the controller accepts motor voltages up to 575 VAC, enabling horsepower ratings of about 7.5 HP at 200–230 VAC or 10 HP at 415–575 VAC. It is rated to carry up to 27 A, with Size 1 configurations typical for small to mid‑sized loads in light industrial equipment, conveyors, pumps, or fans where simple, reliable on/off control is required. As part of Allen-Bradley’s Bulletin 509 family, the 509‑BJD provides direct control without an integrated soft starter or electronic controller, making it a rugged alternative when fixed-speed operation is sufficient. The 509 series is documented as magnetic motor controllers that pair a control coil with a main power contact set in a compact starter frame, designed for panel mounting or standalone installation. The 4R enclosure variant adds protection against dust and moisture, expanding suitability for harsher environments while preserving straightforward wiring and compatibility with standard control circuits.