DiversiTech, 7-CRNR20, Dual Element Fuse, 20 A, 250 V, 200,000 A

DiversiTech 7-CRNR20 – 20A Dual Element Time Delay Fuse, Class RK5

The DiversiTech 7-CRNR20 is a UL-listed Class RK5 dual-element fuse rated at 20 amps and 250 VAC. This fuse is designed to provide reliable overcurrent protection in HVAC equipment and motor branch circuits where momentary inrush currents are common. The dual-element configuration enables time-delay characteristics that prevent nuisance tripping during equipment startup.

With a 200,000 A interrupting capacity, this fuse is suitable for high fault current environments and is typically installed in HVAC disconnects, motor starters, and control panels where selective coordination and consistent protection are required.

Functional and Safety Features

• ✅ Time Delay Operation – Allows motors and compressors to start without premature fuse operation during short-duration overcurrents.
• ✅ High Interrupt Rating – Rated for up to 200,000 amps RMS symmetrical fault current, ensuring protection in high-energy circuits.
• ✅ Dual-Element Fuse Design – Separates overload and short-circuit response characteristics to improve selectivity and equipment uptime.
• ✅ UL Classified, Class RK5 – Meets the performance and dimensional requirements of UL 248-12 for industrial applications.
• ✅ Compact Cartridge Format – Easily integrates into standard RK5 fuse holders and pullout disconnects.

Technical Specifications

• Amperage: 20 A
• Voltage Rating: 250 VAC
• Interrupt Rating: 200,000 A RMS Symmetrical
• Fuse Class: RK5
• Element Type: Dual

Installation Recommendations

Installation should be completed by a qualified technician in accordance with the National Electrical Code (NEC). Ensure the fuse is properly coordinated with downstream equipment and installed using approved RK5 fuse blocks. Verify torque specifications and secure mechanical fit to prevent arc exposure or contact degradation.

Industry Applications

The 7-CRNR20 is commonly used in HVACR systems, control circuits, and compressor protection applications requiring current-limiting performance. Its time-delay characteristics make it particularly effective in systems where inrush current protection is critical to preventing unnecessary system downtime.