40440-300-51 - Allen Bradley Contact Kit

40440-300-51 - Allen Bradley Contact Kit

Restore optimal performance to your motor control systems with the Allen-Bradley 40440-300-51 contact kit—an OEM-grade solution for NEMA Size 4 starters and contactors in Allen-Bradley Bulletin 500, 505, 509, and 520 systems. Designed by Rockwell Automation, this single-pole kit includes all essential replacement components: movable contact, front and rear stationary contacts, spring, and mounting hardware. Perfect for maintaining 3-phase motor control systems rated up to 135 A at 600 VAC, this kit delivers reliable, high-performance switching and reduces costly downtime.

Key Features and Benefits

• OEM-Grade Replacement: Exact fit for NEMA Size 4 contactors in Allen-Bradley Bulletins 500, 505, 509, and 520
• High Current Rating: Supports up to 135 A continuous motor load at 600 VAC (Size 4 equivalent)
• Complete Kit: Includes movable contact, front and rear stationary contacts, spring, and all necessary mounting hardware
• Fast Maintenance: Designed for easy field replacement, minimizing system downtime and labor costs
• Corrosion-Resistant Construction: Long-lasting durability in industrial motor control environments

Technical Specifications

• Kit Type: Single-pole contact replacement kit
  
• Contactor Compatibility: Bulletin 500, 505, 509, 520 (NEMA Size 4)
  
• Poles: 1 Pole
• Rated Current: Approx. 135 A (Size 4 contactor rating)
  
• System Voltage: Up to 600 VAC
  
• Included Parts: Movable contact, front stationary contact, rear stationary contact, spring, screws, and hardware
  

Material Compliance and Certifications

• Standards: Conforms to NEMA ICS‑2 motor control standards
• Build Quality: Manufactured or remanufactured to Allen-Bradley specifications for fit, form, and function
• Distribution: Available through Rockwell Automation and trusted aftermarket suppliers

Suitability and Applications

• Ideal For: Service technicians, OEMs, and industrial maintenance teams
  
• Application Environments: HVAC systems, water treatment, conveyors, pumps, and compressors
  
• Benefits: Cost-effective way to extend contactor life without replacing full assemblies
  

Count on the Allen-Bradley 40440-300-51 Contact Kit to restore high-current motor starters with dependable, OEM-verified performance.