509-COD | Allen-Bradley Full Voltage Non-Reversing Starter NEMA 2, Overload Relay

The Allen-Bradley 509-COD is a Full Voltage Non-Reversing (FVNR) motor starter used to control three-phase motors. It provides direct-on-line motor starting, meaning the motor receives full line voltage during start-up. This model is rated for 45 amps and is commonly applied in manufacturing, pumping, HVAC, and process control systems. It includes an integrated overload relay to protect the motor from current surges. The device offers reliable and straightforward control for forward-only motor operations.

The 509-COD operates on 110/120V AC coil voltage and supports motor line voltages from 115V to 575V. It works efficiently in both 50 Hz and 60 Hz frequency environments. This wide voltage range makes it versatile for many regions and industrial power systems. Its coil design ensures strong contact engagement even under low-voltage conditions. This promotes reliable startup and motor protection.

The 509-COD includes a eutectic alloy overload relay, which provides thermal protection by sensing excessive current flow. When an overload occurs, the alloy melts and triggers a trip mechanism, disconnecting the motor to prevent damage. This method offers a cost-effective and proven protection system. The relay is resettable and can be calibrated for different current ranges. It protects motors from burnout due to prolonged overcurrent conditions.

The 509-COD is offered in an open-style configuration, which means it does not include a protective enclosure by default. This version is designed to be mounted inside a control panel or custom enclosure. The open style simplifies inspection, wiring, and maintenance. For applications that require protection from dust, liquids, or physical damage, it should be installed inside a rated electrical cabinet. Enclosure upgrades like NEMA 12 or 4 can be added externally if needed.

Yes, the 509-COD remains in production and is widely available through Allen-Bradley distributors as of 2025. It is part of a long-standing and reliable family of motor starters. However, since Rockwell Automation updates product lines periodically, it is recommended to verify with your local supplier. If eventually discontinued, equivalents like the E100 or 100-C series may be suggested. Always ensure compatibility with motor ratings and control system design when selecting a replacement.