The Key Transfer System by Schmersal is an advanced safety solution used to secure hazardous zones and control operator access in industrial environments. It operates on a trapped key principle, where a removable key is mechanically locked within the system depending on the machine’s operating condition.
In normal operation (automatic mode), the key is trapped in a key-operated selector switch, preventing removal and ensuring that the machine continues running safely. When the machine is switched off, the key can be released and transferred to a guard locking device, allowing safe access to protected areas.
This system ensures that access to hazardous zones is only possible when dangerous motion has stopped, eliminating the risk of accidental machine start-up. The safety logic is entirely mechanical, meaning that no electrical wiring is required for moving guards, simplifying installation and increasing reliability.
The system typically consists of multiple components, including:
• Key-operated selector switches (SVE / ESS series)
• Guard locking devices (SHGV series)
• Key distribution stations (SVM series) for managing multiple access points
In complex systems, a key distribution station allows a single primary key to control multiple secondary keys, ensuring that all guards are properly secured before the machine can be restarted.
Advanced configurations may include dual lock barrels, preventing unauthorized restart while personnel are inside hazardous zones.
With its robust mechanical design and fail-safe operation, the key transfer system is widely used in applications requiring strict safety control and access management.
Key Features & Specifications
• Trapped key interlocking system for safe access control
• Mechanical safety operation – no electrical wiring required for guards
• Ensures machine stop before guard access is allowed
• Prevents unintended machine start-up during maintenance
• Key-based safety logic for secure and controlled operation
• Modular system components (selector switches, guard locks, key stations)
• Multiple access control via key distribution stations
• Optional dual lock mechanism for enhanced personnel protection
• Robust industrial construction with high protection ratings (IP65/IP67)
• Compliant with EN safety standards for interlocking systems
Applications
Key Transfer Systems by Schmersal are widely used in:
• Industrial automation and machine safety systems
• Conveyor and material handling installations
• Power plants and heavy industrial machinery
• Chemical, steel, and mining industries
• Robotic work cells and automated production lines
• Maintenance access control in hazardous zones
The Key Transfer System by Schmersal provides a highly reliable and maintenance-free safety solution, ensuring controlled access, preventing accidental machine start-up, and enhancing overall operational safety in demanding industrial environments.
