The Convertible NFPA Class II / III Harness is a versatile fire service harness designed to quickly and easily convert from an NFPA Class II seat harness to an NFPA Class III harness. Built for firefighters, technical rescue personnel, and emergency responders, this unique multi-functional system provides the mobility, safety, and adaptability needed for a wide range of operations, including ladder work, aerial apparatus operations, personal escape, rescue, and victim lowering.

The harness features a fixed front waist strap, front-adjusting leg straps, and easy-to-connect hardware for a secure and comfortable fit. Constructed from durable 1-3/4" nylon webbing with high-strength nylon stitching, it is designed to withstand the demanding conditions of emergency response environments. The integrated A-frame assembly includes a sliding D-ring for personal escape system attachment and a triple-action aluminum carabiner for enhanced versatility.

A unique hybrid leg strap configuration combines the mobility of a traditional Class II harness with the support of rescue-style wraparound leg straps. Multiple attachment points at the sternum, dual A-frame locations, and rear dorsal position provide flexibility for fall protection, rescue, work positioning, and escape applications. The Class II base harness and Class III conversion components are sold separately, allowing departments to configure systems based on operational requirements.

Features

• Quickly converts from an NFPA Class II harness to an NFPA Class III harness
• Includes sliding D-ring for personal escape system attachment
• Multi-functional design for fire service and rescue operations
• Fixed front waist strap for secure positioning
• Front-adjusting leg straps for proper fit and comfort
• Easy-to-connect hardware for rapid donning and removal
• Hybrid leg strap configuration combines mobility and rescue support
• Integrated A-frame with dual attachment points
• Includes triple-action aluminum carabiner
• Sternum attachment point for rescue and work positioning applications
• Rear dorsal attachment point for fall arrest applications
• Constructed from durable 1-3/4" nylon webbing
• High-strength nylon thread stitching throughout
• Suitable for ladder operations, aerial apparatus work, personal escape, and rescue
• Class II base harness and Class III conversion sold separately

Specifications

• Manufacturer: Gemtor
• Model Series: 543NYC
• Harness Type: Convertible NFPA Class II / III Harness
• Webbing Width: 1-3/4 in.
• Webbing Material: Nylon
• Thread Material: High-strength nylon
• Hardware: Triple-action aluminum carabiner
• Attachment Points: Sternum, dual A-frame, and rear dorsal
• Compliance: UL Certified to NFPA 2500 / NFPA 1983 (2022 Edition) Class II/III Harness Requirements
• Additional Compliance: NFPA, OSHA, and ANSI rated attachment points

Available Class II Harness Models

Model	Opening Side	Size	Fits Waist
543NYCL-0	Left	Small	30"–44"
543NYCL-2	Left	Regular	36"–50"
543NYCL-4	Left	XL	44"–56"
543NYCR-0	Right	Small	30"–44"
543NYCR-2	Right	Regular	36"–50"
543NYCR-4	Right	XL	44"–56"

Available Class III Conversion Models

Model	Size	Fits Height
543CL3-S	Short	5'0"–5'5"
543CL3-M	Medium	5'3"–6'0"
543CL3-T	Tall	5'5"–6'5"