509-EOD - Allen Bradley Magnetic Starter

509-EOD - Allen Bradley Magnetic Starter

If you’re running larger motors, you already know—startup and protection aren’t things you can afford to get wrong. The Allen-Bradley 509-EOD motor starter is built for that reality. It’s a straightforward, heavy-duty NEMA Size 4 direct-on-line starter that does exactly what it’s supposed to do: start your motor reliably and keep it protected while it’s running.

This unit handles up to 135 amps of continuous current and is rated for 75 HP at 380V (3-phase), so it’s right at home in demanding environments like manufacturing lines, HVAC systems, and pumping applications. What makes it especially useful is the built-in Class 30 overload protection with temperature compensation. In plain terms, it helps prevent your motor from overheating—even when conditions aren’t ideal. That alone can save you from expensive downtime or premature equipment failure.

You’ll also find practical features that make day-to-day use easier, like external reset capability and emergency stop compatibility. The construction is solid, too—silver alloy contacts, corrosion-treated components, and a mechanical lifespan rated in the millions of operations. This isn’t a piece of equipment you’ll be swapping out anytime soon.

Key Features and Benefits

• Handles up to 135A and 75 HP motors
• Direct-on-line (DOL) starting for simple, reliable operation
• Class 30 overload protection with temperature compensation
• Built-in short-circuit protection
• Supports emergency stop applications
• External reset for easier maintenance
• Long lifespan—rated for up to 5 million operations
• Durable materials including silver alloy contacts
• Rail-mountable with secure screw connections

Technical Specifications

• Catalog Number: 509-EOD
• Manufacturer: Allen-Bradley (Rockwell Automation)
• NEMA Size: 4
• Starter Type: Direct Online (DOL)
• Control Voltage: 110V (50 Hz) / 120V (60 Hz) AC
• Continuous Current: 135 A
• Service Limit Current: 156 A
• Horsepower Rating: 75 HP @ 380V, 3-phase
• Max Inrush Current: 1581 A
• Overload Relay Type: Eutectic alloy
• Auxiliary Contacts: Up to 8
• Connection Type: Screw terminals
• Wire Size: 6–4 AWG
• Operating Temperature: Up to 65°C
• Mounting: Rail mountable
• Enclosure: Open type

Material Compliance and Certifications

• Meets IEC 60947-4-3 (Class 2 coordination)
• Corrosion-resistant treated metal components
• Silver alloy power contacts for consistent conductivity
• Designed for 75°C-rated conductors per electrical code

Where It Works Best

• The 509-EOD is a good fit anywhere you need dependable motor control without overcomplicating things:
• Industrial and manufacturing equipment
• HVAC systems and large compressors
• Pumps and material handling systems
• Processing plants and heavy-use environments