The Enabling Device by Schmersal is engineered to provide controlled and safe manual operation of machinery, particularly in situations where standard safety systems are temporarily overridden—such as during setup, troubleshooting, or maintenance tasks.
This device functions as a hand-held or integrated control switch that must be continuously actuated by the operator to enable machine movement. If the operator releases the device or presses it beyond the defined limit, the system immediately interrupts the control signal, bringing the machine to a safe stop.
Typically designed with a three-position (OFF–ON–OFF) operating principle, the enabling device ensures that:
• Position 1 (released): Machine stops
• Position 2 (active/held): Machine operation allowed
• Position 3 (fully pressed): Emergency stop triggered
Schmersal enabling devices, such as the ZSD series, are commonly used in robotics, automated production systems, and mobile control units, where operators need to safely interact with machines in close proximity.
These devices feature ergonomic designs, robust housings, and redundant contact configurations, allowing reliable signal evaluation with safety relays and compliance with standards such as EN IEC 60947-5-8 and ISO 13849 (up to PL d).
Built for industrial environments, they offer high resistance to oil, dust, and mechanical stress, ensuring long-term durability and dependable performance even in demanding conditions.
With their fail-safe operating principle and intuitive control, enabling devices are essential components for safe human-machine interaction in modern automation systems.
Key Features & Specifications
• Three-position enabling function (OFF–ON–OFF) for safe manual control
• Continuous actuation required to enable machine operation
• Automatic shutdown when released or fully pressed
• Redundant contact configuration for reliable safety signal processing
• Compliance with safety standards (EN IEC 60947-5-8, ISO 13849 up to PL d)
• Ergonomic design for comfortable and precise handling
• Robust thermoplastic housing resistant to oil and industrial conditions
• Available in 2 or 3 contact configurations (NO/NC combinations)
• High protection rating (typically IP65) for harsh environments
• Compatible with safety relays, controllers, and PLC systems
Applications
Enabling Devices by Schmersal are widely used in:
• Industrial robots and robotic work cells
• Automated production and assembly lines
• Machine setup, maintenance, and testing operations
• Conveyor and material handling systems
• Packaging and processing machinery
• Any application requiring safe manual intervention in hazardous zones
The Enabling Device by Schmersal provides a reliable and intuitive safety solution for controlled machine operation, ensuring that hazardous movements occur only under direct operator supervision—enhancing both safety and operational efficiency in industrial environments.
