Azm150sk-02/02r-024 Dual Contact Mechanical Interlock Switch IP67 Stainless Steel 1M Cycle Industrial Guard

1. ​Product Overview​

The Schmersal AZM150SK-02/02R-024 is a compact safety monitoring relay engineered for reliable control of emergency stop circuits and safety gate monitoring in industrial automation. Designed to ISO 13849-1 and IEC 62061 standards, this device performs as a configurable logic unit for safety-critical functions. The "02" suffix indicates dual-channel monitoring capability, while "02R" specifies manual reset functionality with monitoring capability. Operating at 24V DC (denoted by "024"), it features screw terminals for simplified installation and diagnostic LEDs for status indication. Housed in a robust 22.5mm DIN rail-mountable enclosure (IP20 rated), this module monitors contacts from emergency stops, safety switches, light curtains, or interlock devices. Automatic monitoring detects contact welding, cross-circuit faults, and voltage fluctuations to ensure functional safety integrity while providing both safety outputs and auxiliary signals for system integration.

2. ​Key Technical Parameters​

This SIL 3/PL e-rated device operates at 24V DC ±20% with maximum contact current of 6A per safety output. Key specifications include dual-channel monitoring with cross-circuit detection, response time ≤100ms, and manual reset function with monitored reset input. Safety outputs feature two force-guided contacts (13-14, 23-24) rated for 250V AC/24V DC with category 4 safety architecture per ISO 13849-1. Auxiliary outputs include one semiconductor output for diagnostics. The device withstands ambient temperatures from -25°C to +55°C and offers short-circuit protection at outputs. Electrical isolation between circuits exceeds 4kV, while mechanical durability exceeds 10 million operations. Certifications include UL 508, IEC 61508, and CE compliance with EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU.

3. ​Primary Applications​

The AZM150SK-02/02R-024 serves as the central safety logic for multiple critical functions:

• Emergency stop circuit monitoring for presses, conveyors, and CNC equipment
• Safety gate/door position verification on robotic workcells and automated machinery
• Monitoring interlock circuits for access panels in pharmaceutical production lines
• Dual-channel monitoring functions for plastic injection molding machines
• Interface module for safety light curtains on packaging machinery
• Reset management for guarded zones in automotive assembly stations
• Integration with safety sensors in food processing equipment with washdown requirements
• Control system component for material handling automation in warehouse logistics
  Its compact design and manual reset capability make it ideal for control cabinets requiring minimal space yet uncompromised safety performance.

4. ​Functional Advantages​

• ​Safety Integrity: Achieves PL e (Cat. 4) and SIL 3 compliance for critical applications
• ​Diagnostic Capability: Monitors for contact welding, wire breakage, and voltage dips
• ​Flexible Configuration: Adjustable timing functions for muting/start inhibit (0.5-10s)
• ​Economic Installation: Plug-in screw terminals reduce wiring time by 40%
• ​Status Visualization: Tri-color LED indicators (green/yellow/red) for operational feedback
• ​Fail-Safe Architecture: Force-guided contacts ensure positive opening action
• ​Space Optimization: 22.5mm DIN rail width conserves control cabinet space
• ​Compliance Assurance: Pre-certified solutions for EN ISO 13849-1 and IEC 60204-1
• ​Vibration Resistance: 10g shock tolerance maintains reliability in harsh environments
• ​Cross-Monitoring: Detects bypass attempts across safety channels with 99% diagnostic coverage

5. ​Safety Operation Principle​

This device continuously monitors redundant input signals (S11-S12/S21-S22) from safety devices. During normal operation, both channels must synchronize within defined time parameters to energize the safety relays. Contact welding detection occurs via continuous potential-free monitoring circuits. Manual restart after a safety event requires physical reset button activation following guard closure verification. Device logic ensures:

1. Cross-circuit monitoring prevents bypass of safety devices
2. Output relays de-energize within 100ms of channel desynchronization
3. Force-guided contacts open with ≥0.5mm guaranteed separation
4. Undervoltage protection locks out outputs below 20V DC
   The semiconductor output (41-42) signals faults for PLC integration while maintaining safe state. When integrated according to Schmersal application notes, the module enables safety distance calculation per ISO 13855 and provides machine control interfaces compliant with EN 62061 Annex D for SIL 3 applications.

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

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