RS655-Z22 - Redundant E-Stop Safety Relay - SIL3 Metal IP67 Industrial

1. Product Overview​

The Schmersal RS655-Z22 is a robust safety limit switch engineered for critical position monitoring and access control in industrial machinery. Featuring a ​zinc die-cast housing (IP67 rated)​, this device utilizes a ​roller lever actuator (Z22 suffix)​​ to detect guard door positions with high reliability. Designed to ​ISO 13849-1 PL e (Category 4)​​ and ​IEC 62061 SIL 3​ standards, it incorporates ​force-guided positively driven contacts​ that guarantee safe switching even during component failure. The switch operates at ​24V DC​ with a mechanical life exceeding ​1 million operations​ and withstands temperatures from ​​-25°C to +70°C. Its corrosion-resistant construction and integrated cable gland (PG11) ensure reliable performance in harsh environments like metalworking, automotive assembly, and material handling systems. The bright yellow actuator provides high visibility while offering ±3mm lateral tolerance for installation flexibility.

​2. Key Technical Parameters​

• ​Safety Ratings:
  • PL e (ISO 13849-1 Cat. 4)
  • SIL 3 (IEC 62061)
  • PFHD: 4.7×10⁻⁹/h
• ​Electrical Specifications:
  • Voltage: 24V DC ±10%
  • Contacts: 2 NC + 2 NO (force-guided)
  • Current Rating: 6A @ 250V AC / 8A @ 24V DC
• ​Mechanical:
  • Actuator Type: Roller lever (Z22)
  • Operating Force: 5-7N
  • Pretravel: 15° ±3°
• ​Environmental:
  • IP67 (IEC 60529)
  • Shock Resistance: 30g (IEC 60068-2-27)
  • Chemical Resistance: Resists oils, coolants
• ​Connection:
  • Cable Entry: PG11
  • Terminal Capacity: 4×1.5mm²
• ​Certifications:
  • UL 508, CSA C22.2 No. 14
  • CE, UKCA, RoHS

​3. Primary Applications​

This safety switch is essential for safeguarding hazardous machinery:

• ​Robotic Workcells: Guard door position monitoring for collaborative robots
• ​Press Brakes: Safety gate position verification on metal forming equipment
• ​CNC Machining Centers: Tool changer access door monitoring
• ​Packaging Lines: Hatch position detection on vertical form-fill-seal machines
• ​Material Handling: Conveyor system guard position confirmation
• ​Plastic Injection: Mold area access door interlocks
• ​Automotive Assembly: Safety gate monitoring on paint booths
• ​Heavy Equipment: Access panel security for maintenance enclosures
  Its roller lever actuator provides reliable operation in high-vibration environments, while IP67 protection ensures functionality in areas with dust exposure or occasional liquid splashes.

​4. Functional Advantages​

• ​High Misalignment Tolerance: ±3mm lateral compensation prevents false triggers
• ​Visual Status Indicators:
  • Integrated window for contact position viewing
  • Optional LED version available (RS655-Z22-LED)
• ​Positive-Break Assurance:
  • Mechanically linked contacts guarantee ≥0.5mm separation
  • EN 60947-5-1 Annex K compliant
• ​Corrosion Resistance:
  • Zinc housing with chromate plating
  • Stainless steel actuator components
• ​Installation Flexibility:
  • Multiple mounting orientations
  • Adjustable lever angles (90°-180°)
• ​Maintenance Reduction:
  • Self-cleaning contacts

  1 million mechanical operations

• ​Safety Compliance:
  • Pre-validated for EN ISO 14119
  • Compatible with safety relays up to SIL 3
• ​Cost Efficiency:
  • Tool-free contact block replacement
  • Standardized mounting footprint

​5. Safety Operation & Diagnostics​

​Mechanical Operation:

1. ​Guard Closure:
   • Roller lever depressed by guard (5-7N force)
   • NC contacts close to enable machine operation
2. ​Guard Opening:
   • Lever releases, positively opening NC contacts within 20ms
   • Machine enters safe state (Stop Category 0)
3. ​Contact Monitoring:
   • Force-guided mechanism ensures:
     • NC contacts open before NO contacts close
     • Welded contacts prevent opposite contact movement

​Diagnostic Features:

• ​Physical Inspection Window:
  • Red indicator shows contact position
  • Yellow indicates actuator engagement
• ​Electrical Monitoring:
  • Safety controllers detect contact state mismatches
  • Auxiliary NO contact signals fault conditions

​Reset Protocol:

• Automatic reset upon guard reclosure
• Manual verification required after detected faults

Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

we are major in PLC,Sensors,HIM,Transmitters.

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