D4 Rescue Descender

The D4 Rescue Descender is a high-performance rope control device designed for rescue operations, rope access work, industrial descent applications and controlled lowering systems. Manufactured by ISC, the ISC D4 is widely recognised as a professional double stop descender that combines safety, control and operational efficiency in demanding work environments.

The D4 descender features an innovative progressive cam action designed to deliver smooth and precise rope control during descent. Its unique double stop device function automatically activates when the handle is released, helping minimise unintended movement and improving user safety.

The handle rotates through a full 360 degrees with audible position clicks to assist users in identifying operating positions during use. This design supports controlled operation and improved handling during rope access and rescue scenarios.

The D4 Rescue Descender is also designed for high-load rescue situations, supporting a working load capability suitable for two-person rescue applications without requiring additional friction control systems.

Across Australia, the ISC D4 Rescue Descender is commonly used by rope access technicians, emergency rescue teams, confined space operators and industrial height safety professionals.

Key Features:

• Professional D4 Rescue Descender for rope access and rescue applications
• Innovative progressive cam action for smooth rope control
• Integrated double stop device safety function
• Auto-lock feature activates when handle is released
• 360° rotating handle with audible position indicators
• Designed for rescue, descent and industrial applications
• Supports high working load rescue operations
• Suitable for two-person rescue scenarios
• Durable construction for demanding environments
• Trusted by rope access and rescue professionals

• Approved EN12841m, NFPA 1983 and ANSI Z359

Download or view D4 Rescue Descender User Manual (2MB)

Specifications are subject to manufacturer updates. Always verify compliance requirements with your site safety manager before use.

For rope compatibility, technical specifications, load ratings, inspection requirements and operating guidance for the D4 Rescue Descender, refer to manufacturer documentation or contact Link Resources.

Link Resources can assist with:

• Rope access equipment selection
• Rescue system setup guidance
• Product compatibility advice
• Industrial descent system recommendations
• Australian height safety compliance support
• Rescue equipment integration assistance