Allen-Bradley 509-B0D Industrial Motor Starter

The Allen-Bradley 509-B0D Industrial Motor Starter is a NEMA Size 1 direct‑online non‑reversing motor starter from Allen‑Bradley’s Series B family, paired with the 42185-800-01 overload relay. It uses a 120 V AC control coil and is rated for line voltages up to 600 VAC with a maximum current rating of 27 A, making it suitable for starting smaller industrial motors in control panels and equipment. The overload relay protects the motor by monitoring current and tripping if the thermal condition exceeds the setting, helping to prevent overheating and damage. Common applications include conveyors, pumps, fans, and other automated equipment where compact, reliable motor control is required in industrial environments. This starter assembly is typically used with compatible Allen‑Bradley accessories and field wiring for straightforward control of motor start/stop with overload protection.