Sum Fader Auto Belay Device

The SUM is a new generation belay descender device designed to be used with a UIAA single ropes from 10.5 to 9.1mm in diameter, which makes it unique in the market.

Its exclusive and innovative concept, not only arrests the wide rope diameter variation of ropes 10.5 to 9.1mm , but also achieves dynamic braking. The Sum arrests and holds with significantly reduced shock loading on the belay and safety chain components. The climber, the belayer, the belay system and anchors benefit from this impact reduction, increasing security and useful life of the whole belay system Components.

Thanks to its ergonomic and lightweight design, the SUM is not only robust and secure, but easy and vary safe to use.