Allen-Bradley 509-AOD NEMA Size 0 Magnetic Starter

Allen-Bradley 509-AOD is a NEMA Size 0, full-voltage magnetic starter designed for compact, single-direction motor control in light industrial equipment. It uses a 115–120V AC coil at 60 Hz and ships in an open-type, non-enclosed footprint suitable for panel mounting or control-cabinet installation. The 3-pole assembly includes a eutectic alloy overload relay and provides a continuous current rating of 18 A at size 0, enabling reliable start/stop operation for small motors while protecting the circuit from overload; it is a non-reversing starter, meaning motor rotation is controlled in a single direction. The 509-AOD supports motors up to 575V AC maximum and is commonly chosen when a compact, robust starter is required for straightforward on/off control in basic motor-control circuits.