Description
ISC D4 Descender – High-Range 360° Handle Descender for Tree Climbing and Rescue
The ISC D4 is a high-performance descender built for arborists and rescue professionals who need precise speed control across the full range of descent speeds. With a 360-degree rotating handle and a 240 kg range, it is one of the most capable and versatile devices available for professional rope work.
Key Features
The D4’s 360° rotating handle — marked with audible clicks at each position — allows the operator to adjust friction and descent speed intuitively without losing grip or repositioning. The aluminum handle is coated with a grip-enhancing paint for confident control in wet or demanding conditions. An integrated anti-panic system provides an additional safety layer for high-load or high-speed situations.
The exceptional 240 kg capacity enables two-person rescue operations, making the D4 a genuine multi-role device for arborists who are also part of emergency response teams. Certified to EN 12841, ANSI Z359, and NFPA 1983.
Technical Specifications
| Feature | Technical Data |
|---|---|
| Manufacturer | ISC |
| Model | D4 |
| Rope diameter | 10.5–11.5 mm |
| Load capacity | 240 kg (two-person rescue) |
| Handle rotation | 360° with audible click positions |
| Anti-panic system | Yes |
| Weight | 655 g |
| Dimensions | 140 × 82 × 98 mm |
| Certifications | EN 12841, ANSI Z359, NFPA 1983 (meets EN 341 requirements) |
| Recommended use | Tree climbing, rope access, rescue operations |
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