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StedFAST - Emergency Stop Pull Key Systems for Conveyor Protection

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The StedFAST Emergency Stop Pull Key Systems by Davis Derby Ltd are designed to ensure conveyor safety in various industrial settings, including quarries, mines, processing plants, ports, and railway depots. These systems are crucial for integrating and upgrading existing conveyor protection devices, supporting both new installations and retrofit applications. The system's primary component is the pull cable-operated safety switch, which adheres to BS EN ISO 13849-I PLe Category 3 standards for safety. This versatile technology serves as a dual-function device; it can be installed as a standard stop switch or adapted to serve as an emergency stop system, triggering a halt in conveyor operations during critical situations. By utilizing internal positive break micro-switches in conjunction with certified safety relays, the system ensures comprehensive adherence to emergency stop requirements across connected machinery. Designed with precision, each unit measures 303mm in length, 135mm in depth, 116mm in height, weighs 2.2kg, and includes easily accessible fixing hole centers.
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Davis Derby’s comprehensive range of StedFAST® conveyor protection devices protect people and plant in quarries, mines, unnels, processing plants, ports and railway depots worldwide.

All Davis Derby devices are compatible and can be easily installed by qualified electrical engineers on new or retrofit schemes. The primary stopping device on any conveyor system is the pull cable/wire operated safety switch, now available in compliance to BS EN ISO 13849-I PLe Category 3 standards.

Davis Derby design and manufacture a double-ended stop device, which can be adopted as either a normal stop switch, or wired to function as an emergency stop switch, isolating conveyor movement in the event of incidents. When required to operate as a normal stop switch, the pull key device can be either, wired and fitted to some or all of the moving parts of conveyor machinery to render them safe.

Alternatively, when required to operate as an emergency stop switch, all the pull keys internal positive break micro-switches should be used and connected to any/all parts of conveyor machinery. By connecting up all the micro switches to a certified safety relay, the pull key system will comply with the emergency stop standards of BS EN ISO 13849-I PLe (Category 3) . To enable a successful emergency stop control, all pull keys and safety
relays must be connected to the machinery it is protecting and to all upstream and downstream equipment, where deemed necessary.

  • Dimensions: 303mm L x 135mm D x 116mm H
  • Fixing Hole Centres: 178mm, 10mm Diameter
  • Weight: 2.2Kg.

All of Minewatch HT 800 Series pullkey range is designed for use in safety critical systems for controlling conveyors. Each key can therefore be used as either a Stop Switch or as a Category 2 or Category 3 Emergency Stop Switch as defined in BS EN ISO
13849-I PLe.

  • Pullkeys are moulded from high stability UV protected polycarbonate, which is tough and lightweight.
  • Pullkeys can be used in conjunction with all our relay control units, or on a control circuit up to 110 volts ac. For systems to comply with emergency stop safety regulations, safety relays must be used.

Safety relays available to order:

  • ICR3 (2 relay output)
  • 23418 (standard relay)
  • SRP1 (Pilz)