ISC D4 Rescue Belay Descender

ISC D4 Rescue Belay Descender

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ISC D4 Rescue Belay Descender

The  D4 Pro Work/Rescue Belay Descender features a unique and innovative cam action, which offers precise control at slow or fast speeds. The progressive cam works by way of one cam operating inside another cam. The D4 has a 240kg (500lbs) Working load limit which means it is suitable for two-man rescue, without the need for the creation of extra friction. This is a true panic stop device rather than a panic brake device. The difference is that once the panic stop is activated, no other force must be applied to the device. A panic brake style device requires a force input to continue the braking function. Can be used for progress capture in hauling systems and allows rapid conversion between raising and lower.

ISC D4 Rescue Belay Descender Features:

  • Minimum Breaking Strength 3597 lbf. (16 kN)
  • Rope Diameter: 7/16" inche. (10.5 - 11.5 mm)
  • Number of persons: 2
  • WLL: 500 lbs. (240 kg)
  • Panic brake: Yes
  • EN12841, ANSI Z359, NFPA 1983- meets the requirements of EN341
  • Color: Red/Black


  • Width: 3.26" inches. (83 mm)
  • Height: 7.87" inches. (200 mm)
  • Weight: 24 oz. (678 g)

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