Allen-Bradley 440H-S34021 Safety Hinge Switch

Product Overview

The Allen-Bradley 440H-S34021 Guardmaster Sprite Hinge Switch is a safety interlock switch designed for monitoring the position of hinged machine guards, doors, covers, and access panels. It provides a safety signal to the machine control system when a guard is opened, helping prevent hazardous machine operation during access.

The switch belongs to the 440H Guardmaster Sprite series and features a compact hinge-mounted design with a solid actuator shaft, suitable for small and medium-sized industrial machines.

Main Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Model: 440H-S34021
• Series: Guardmaster Sprite 440H
• Product Type:
  • Safety Hinge Switch
  • Safety Interlock Switch
  • Machine Guard Switch
• Contact Configuration:
  • 1 Normally Closed (Safety)
  • 1 Normally Open (Auxiliary)
• Contact Operation: Break Before Make (BBM)
• Actuator Shaft:
  • Solid shaft
  • Length: 80 mm
  • Diameter: 10 mm
• Connection: M16 Conduit
• Housing Material: Plastic
• Protection Rating: IP67
• Standards: IEC 60947-5-1 / ISO 14119

Technical Functions

The 440H-S34021 provides:

• Machine guard position monitoring
• Safety circuit interruption when guard opens
• Prevention of unexpected machine startup
• Auxiliary indication signal for control systems
• Reliable safety feedback

Working principle:

Safety Guard Closed → Switch Activated → Safety Circuit Enabled
Safety Guard Open → Safety Contact Opens → Machine Safety Stop Triggered

Features & Advantages

• Original Allen-Bradley Guardmaster safety component
• Compact miniature hinge design
• Forced-guided safety contacts
• IP67 protection for industrial environments
• Easy installation on hinged guards
• Adjustable cam mechanism for precise operation
• Long mechanical service life
• Suitable for safety-related machine applications

Applications

Used in:

• Industrial machinery
• Packaging equipment
• CNC machines
• Assembly lines
• Robotic work cells
• Printing equipment
• Automated production systems

Typical applications:

• Safety door monitoring
• Protective cover interlocking
• Machine access protection
• Emergency safety circuits

Compatible Equipment

Commonly used with:

• Allen-Bradley Guardmaster Safety Relays
• GuardLogix Safety Controllers
• Safety PLC systems
• Machine safety circuits
• Industrial control panels

Important Notes

• 440H-S34021 is a safety switch, not a standard limit switch.
• Designed for hinged guards and doors; it should not be used as a load-bearing hinge.
• Verify contact configuration and shaft size before replacement.
• Ensure wiring complies with the machine safety circuit requirements.
• Requires proper safety evaluation according to the machine risk assessment.