509-AOD - Allen Bradley Magnetic Starter Description
509-AOD - Allen Bradley Magnetic Starter
If you’ve dealt with motor failures before, you already know—they don’t happen at a convenient time. The Allen-Bradley 509-AOD motor starter is built to help prevent that. It’s a straightforward, reliable solution for controlling and protecting motors without adding unnecessary complexity to your setup.
This is a NEMA Size 0 direct-on-line (DOL) starter, rated for 18 amps continuous current and up to 5 horsepower at 575V (3-phase). It’s commonly used in everyday industrial applications where you just need equipment to start, run, and stay protected.
What makes this unit especially useful is the Class 30 overload protection. It gives your motor enough time to handle normal startup conditions, but steps in when there’s a real overload situation—helping reduce the risk of damage. It also includes temperature compensation, which means it adjusts more accurately based on the environment instead of tripping too early or too late.
The construction is solid where it counts—silver alloy contacts for conductivity, long mechanical life, and simple screw terminal connections that make installation and maintenance easier.
Key Features and Benefits
- Built-in overload protection (Class 30) helps protect motors from overheating
- Direct-on-line starting keeps things simple and easy to manage
- 18A continuous current rating for common industrial motor applications
- Handles up to 5HP at 575V (3-phase)
- Temperature-compensated protection for more accurate performance
- External reset capability for easier troubleshooting and restart
- Supports emergency stop applications
- Up to 8 auxiliary contacts for added control flexibility
- Rail mountable design for straightforward installation
Technical Specifications
- Catalog Number: 509-AOD
- Type: Direct Online Starter (DOL)
- NEMA Size: Size 0
- Continuous Current: 18A
- Service Limit Current: 21A
- Max Horsepower: 5HP @ 575V, 3-phase
- Control Voltage: 110V (50 Hz) / 120V (60 Hz) AC
- Overload Relay: Eutectic alloy, Class 30
- Short-Circuit Release: Yes
- Max Inrush Current: 140A
- Operating VA Burden: 29VA (sealed, 60 Hz coils)
- Connections: Screw terminals (power & control)
- Wire Size: 14–10 AWG
- Auxiliary Contacts: Up to 8
- Mechanical Life: 10 million operations
- Mounting: DIN rail capable
- Enclosure: Open type
Material Compliance and Certifications
- It aligns with IEC 60947-4-3 Class 2 coordination standards, which helps ensure proper protection under fault conditions. For installation, wiring should follow 75°C (167°F) rated conductor requirements in accordance with local electrical codes.
Where It Works Best
- The 509-AOD fits into a wide range of setups where dependable motor control is needed, such as:
- Pumps and compressors
- HVAC equipment
- Conveyor systems
- Material handling equipment
- General manufacturing machinery
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Allen-Bradley® is a registered trademark of Rockwell Automation, Inc. Products sold are surplus, used, or refurbished and are NOT supplied by Rockwell Automation.
Specifications
- Width:3.5
- Height:7.5
- Depth:4.5
- Poles:3
- Amperes:18
- Type:509
- Sub-Category:Magnetic Starter
- Additional Notes:Allen Bradley, 3 Phase, NEMA Size 0, Class 509, Open Type, Full Voltage Non-Reversing, Magnetic Starter with 120 Volts A.C. Coil. HP ratings are: 3 @ 200Volts A.C.; 3 @ 230Volts A.C.; 5 @ 460Volts A.C.; 5 @ 575Volts A.C. Thermal Units (Heaters) are sold
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