Overview
The Allen-Bradley 509-CAD /B is a dependable NEMA-rated motor starter for industrial motor control applications. This Size 2 non-reversing starter provides full-voltage motor starting with integrated overload protection in a compact, surface-mount Type 1 enclosure. Originally designed for three-phase motor circuits, it remains a reliable workhorse in manufacturing, packaging, material handling, and process automation systems.
Key Features
- NEMA Size 2 full-voltage non-reversing starter
- 115–120V 50/60 Hz control voltage with 3-phase motor circuits
- Eutectic alloy overload relay for motor thermal protection
- Type 1 general-purpose enclosure rated for indoor use
- 45 ampere continuous rating at rated load
- Surface-mounted design for easy installation and wiring
Technical Specifications
The 509-CAD /B meets standard industrial motor control specifications. Its overload protection is factory-set and suitable for most three-phase induction motors in the 3–5 horsepower range. The eutectic-alloy design responds predictably to thermal overload conditions, providing both motor and circuit protection without the need for separate fusing.
Typical Applications
- Pump and compressor motor starting
- Conveyor and material handling systems
- HVAC and fan motor control
- Packaging machinery and production lines
- OEM equipment retrofit and replacement
Compatibility & Replacements
The 509-CAD /B is part of Rockwell’s 509 NEMA Enclosed Non-Combination Starter family. Direct replacements or similar-series alternatives include other 509 variants (509-CAD, 509-CAD-1, 509-CAD-3) depending on control voltage and motor requirements. Always verify motor horsepower, phase configuration, and overload relay class before substitution. For exact compatibility and replacement cross-references, consult the Rockwell Automation specification sheet or contact a factory-authorized distributor.
