Allen-Bradley 509-A0D Contactor Starter Size 0

Allen-Bradley 509-A0D Contactor Starter Size 0 is a NEMA full-voltage, non-reversing motor starter with an integral eutectic alloy overload relay, offered in an Open Type Without Enclosure for straightforward panel mounting. It supports 2–5 pole configurations in the Size 0 family and uses a 115–120 VAC, 60 Hz coil; the Series B variant is commonly specified with a continuous current rating up to 18 A at up to 600 VAC. The starter is designed for 3‑phase motors and is rated to handle up to 5 HP at higher line voltages (575 VAC) in non‑plugging, non‑jogging duty. Dimensions are approximately 3.8 in wide by 8.0 in high by 5.0 in deep, aligning with its Open Type Without Enclosure format to simplify installation. Typical applications include pumps, fans, conveyors, and other light industrial equipment where reliable overload protection and straightforward control are required.