Allen-Bradley 509-AOB Full Voltage Non-Reversing Starter

The Allen-Bradley 509-AOB Full Voltage Non-Reversing Starter (509AOB) is a direct-on-line (across-the-line) starter that provides overload protection for three-phase motors in industrial motor control systems. Designed for use in motor control centers, pump stations, conveyors, and manufacturing equipment, it enables across-the-line starting while integrating a thermal overload relay compatible with the Bulletin 509 family. Key specifications include panel-mount or motor control center installation, coil voltage and horsepower rating that are application dependent, and a New Surplus Factory Box (NSFB) condition, reflecting its availability for replacing legacy starters or refurbishing control panels. Common replacements and compatibility include Allen-Bradley 509-BOD, Schneider Electric LC1D32, and Siemens 3RT2036, underscoring its role within a broader interoperable motor-control ecosystem.