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ISC Wales

ISC D4 Rope Access Descender

This is a rope access descender that is built to last.  Very smooth and reassuring descent.  It doesnt need any extra friction for rescues.  Takes a little getting used to if moving from the Petzl ID, but this descender will last much longer.

The D4 Work/Rescue 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. 

The handle mechanism is designed to rotate through 360º making its use easier and simpler. The handle itself is made from aluminium rather than plastic and is coated with a specially chosen paint which provides extra grip. Cleverly, the handle rotation is accompanied by audible clicks which help the user identify the correct position of the handle. 

For more information on what we and many dozens of experienced industry users think is the best work/rescue descender in the world, download the datasheet and User Instruction Manual below. We agree it's a great piece of rope access equipment.

Here are some tech points:-

It is approved to EN12841, ANSI Z359, NFPA 1983- meets the requirements of EN341.
It has a 5kN slip load and is rated to a maximum operator weight of 240kg.
Height (mm) 140
Height (inches) 5 1/2
Width (mm) 82
Width (inches) 3 1/4
Thickness (mm) 98
Thickness (inches) 3 7/8
Weight (grams) 655
Weight (ounces) 23
Compatible with rope diameter (mm) 10.5-11.5mm (7/16")
Panic brake Yes
Number of persons 2
Body material Aluminium
Cam material Unknown
Body finish Anodised
(MBS) Minimum Breaking Strain (kN) 16
(MBS) Minimum Breaking Strain (lbf) 3597

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