Overview
The Allen-Bradley 509-ACH /B full-voltage starter is a robust NEMA-standard solution for direct-on-line (DOL) motor control. This unit is part of Rockwell Automation’s Bulletin 509 non-reversing starter line, engineered for reliable performance in industrial motor applications. Paired with the 509-A0H /B auxiliary component, this starter provides flexible control configurations for manufacturing, processing, and facility automation environments.
Key Features
- NEMA Full-Voltage Design: Direct-on-line switching for across-the-line motor starting without reduced-voltage methods
- Modular Construction: Available as individual components or modular kits for flexible assembly and maintenance
- Eutectic Alloy Overload Relay: Built-in thermal motor protection with reliable heater element design
- Open-Type Configuration: Compact open-frame design suitable for control enclosure integration
- Auxiliary Contact Options: 509-A0H /B provides additional control contacts for interlocking and signaling applications
- Standard Coil Voltages: Typically available with 120V AC or 240V AC coil options for North American installations
Technical Specifications
- Series: Bulletin 509 NEMA Starter
- Type: Non-Reversing, Full-Voltage (DOL)
- Standard Coil Voltage: 120V AC / 240V AC (at 60 Hz)
- Overload Relay Type: Eutectic Alloy
- Mounting: Baseplate/panel-mount (open type)
- Enclosure: Open-type without enclosure
- Contact Configuration: 3-pole power switching + auxiliary contacts via 509-A0H /B
- Certifications: NEMA ICS-2 compliant
- Standards: Meets IEC 947-4 performance requirements
Typical Applications
The 509-ACH /B is widely deployed in:
- Motor control centers (MCCs) and industrial control panels
- Direct-on-line starting of three-phase induction motors
- Manufacturing and assembly line equipment
- HVAC and facility automation systems
- Pump and compressor motor control
- General-purpose industrial motor applications up to the starter’s current rating
Compatibility & Replacements
The 509-ACH /B is part of the Bulletin 509 modular starter ecosystem, which allows for flexible ordering as individual components or complete modular kits. The 509-A0H /B auxiliary contact block integrates directly with this starter base to add control functionality. For proper heater element selection and motor protection coordination, consult current Rockwell Automation overload relay specifications (publication 592-TD010). Compatible with standard three-phase motor starting applications requiring full-voltage, non-reversing control. When replacing an existing starter, verify your motor’s full-load current and select matching overload relay heater elements accordingly.
