The Pull-Wire Switches by Schmersal are engineered to deliver reliable emergency stop and safety monitoring across long machine layouts where traditional push-button emergency stops may not be easily accessible. These switches are typically installed along conveyor belts, production lines, or large industrial machines.
A tensioned wire or rope is mounted along the machine. When the wire is pulled—or if it becomes slack or breaks—the switch is activated and immediately interrupts the control circuit, stopping the machine to prevent accidents or equipment damage.
Schmersal pull-wire switches are available in multiple series such as ZQ, RS, and TQ, offering configurations for one-side or two-side operation and supporting wire lengths of up to 75 m (single side) or even 2 × 100 m (dual side) depending on the model.
These switches are designed with integrated wire pull and breakage detection, ensuring that both emergency activation and cable faults are reliably detected. They also feature mechanical position indicators and reset mechanisms, allowing safe restart only after the issue is resolved.
Built with durable metal or thermoplastic enclosures, and protection ratings up to IP66/IP67, Schmersal pull-wire switches are suitable for harsh industrial environments, including applications in dust-prone or outdoor conditions.
With their rugged construction and dependable switching performance, these devices play a critical role in improving workplace safety and ensuring reliable operation of industrial systems.
Key Features & Specifications
• Emergency stop activation via wire or rope pull
• Full-length safety coverage along conveyors and machinery
• Wire pull and breakage detection for enhanced safety
• One-side or two-side operation options (up to 75 m / 2 × 100 m)
• Robust metal or thermoplastic housing for industrial durability
• Mechanical position indicator for clear switch status
• Manual reset (release push button) for controlled restart
• Large wiring compartment for easy installation
• Protection ratings up to IP66 / IP67 for harsh environments
• Available in standard and explosion-proof (Ex) versions for hazardous zones
• Compliant with industrial safety standards (IEC / EN)
Applications
Pull-Wire Switches by Schmersal are widely used in:
• Conveyor belt and bulk material handling systems
• Mining, cement, and steel industries
• Power plants and heavy industrial facilities
• Packaging and processing lines
• Warehousing and logistics systems
• Large-scale automated production environments
The Pull-Wire Switches by Schmersal provide a dependable emergency stop solution across extended machine layouts, ensuring rapid response, enhanced operator safety, and reliable protection for industrial equipment in demanding environments.
