Overview
The Allen-Bradley Guardmaster HS-1 is a proven rotacam safety interlock switch engineered for machine safety applications. As part of the 440H product line, this hinge-actuated switch connects directly to existing guard door hinge pins, automatically isolating machine power when the guard opens. The HS-1 delivers forced-guided safety contacts with tamper-resistant design, complying with EN 1088 and machinery directive requirements.
Key Features
- Hinge-Actuated Design: Integrates with existing door hinge pin for seamless retrofit or new installation.
- Fast Power Isolation: Cuts power at just 5° of guard door opening; adjustable cam allows 5°–11° operation range.
- Forced-Guided Contacts: 2 Normally Closed (N.C.) safety contacts + 1 Normally Open (N.O.) auxiliary contact for signaling or alarm functions.
- Sealed IP66 Housing: Heavy-duty die-cast aluminum construction rated IP66 (dust and splash resistant), ideal for harsh industrial environments.
- Compact, Efficient: M16 conduit entry (Pg11 or 1/2″ NPT available); minimal installation footprint.
- In-Stock, Ready to Ship: New in box condition; drop-in replacement for existing 440H Rotacam units.
Technical Specifications
The HS-1 meets international safety standards and is suitable for stand-alone or networked safety systems:
| Specification | Value |
| Rated Current (AC/DC) | 0.5–2 A @ 250 VAC/DC |
| Contact Configuration | 2 N.C. Safety + 1 N.O. Auxiliary |
| Actuation Angle (Adjustable) | 5° to 11° |
| Sealed Rating | IP66 (dust and splash-proof) |
| Housing Material | Die-cast aluminum alloy |
| Conduit Entry | M16 (Pg11 or 1/2″ NPT optional) |
| Weight | 0.91 lbs (0.41 kg) |
| Safety Category | EN 954-1; forced-guided contacts per IEC 947-5-1 |
| Standards Compliance | EN 292, EN 60204-1, EN 1088, Machinery Directive |
| Product Series | 440H Rotacam Heavy-Duty Hinge Switches |
Typical Applications
- Machine Tool Guarding: Lathes, mills, presses, and grinders requiring EN 1088 compliance.
- Press Brake & Punching Equipment: Guards doors on hydraulic or mechanical presses.
- Automatic Doors on Industrial Machinery: Light to medium-weight guard door interlock.
- Conveyor & Packaging Lines: Emergency stop and guard interlocking on modular production systems.
- Hazardous Area Equipment: With appropriate explosion-proof (EX) or pneumatic variants available.
Compatibility & Replacements
Compatible With
- Allen-Bradley Guardmaster safety relay modules and MSR (Minotaur) safety contactors.
- Standard 24 VDC and 240 VAC industrial control circuits.
- Guardlink safety linking technology (Rockwell EtherNet/IP integration available).
- Existing machinery hinge pin assemblies (5/8″ and 3/4″ shafts).
- Any safety-rated circuit requiring forced-guided interlock contacts.
Replaces / Drop-In Replacement For
- Earlier Guardmaster Rotacam switch models without advanced diagnostics.
- HS-1-C (standard variant without pressure housing).
- Generic hinge interlock switches meeting EN 1088 basic requirements.
Works With
- Safety Relays: Rockwell MSR131RTP, MSR131T, Minotaur range.
- Safety Monitoring: Guardlink EtherNet/IP for real-time diagnostics and downtime reduction.
- Communication Protocols: Hardwired safety circuits; optional Guardlink for networked status reporting.
- Installation & Design Software: Verify compatibility with your system integrator before final wiring.
