DiversiTech, 7-CRNR40, Dual Element Fuse, 40 A, 250 V, 200,000 A

DiversiTech 7-CRNR40 – Dual Element Time Delay Fuse for HVAC and Electrical Protection

The DiversiTech 7-CRNR40 is a Class RK5 dual-element, time delay fuse designed to protect HVAC systems and industrial equipment against sustained and short-duration overcurrent conditions. Rated for 250 VAC and 40 amps, this fuse provides circuit protection that accommodates inrush currents while maintaining safety under fault conditions.

Commonly deployed in disconnects, control panels, and motor branch circuits, the 7-CRNR40 meets UL and NEC requirements for overcurrent protection in demanding applications. Its dual-element configuration enhances system selectivity, helping prevent unnecessary fuse operations caused by harmless surges such as motor startup loads.

Performance Features

• ✅ Dual-Element Design – Provides extended time-delay characteristics for handling motor inrush current without nuisance opening.
• ✅ Interrupt Rating: 200,000 A RMS Symmetrical – Ensures safe operation under high fault current conditions in accordance with UL 248-12 standards.
• ✅ Class RK5 Construction – Compact profile suitable for modern fuse blocks and disconnect switches in HVAC and electrical systems.
• ✅ 40 Amp Capacity – Rated for HVAC compressors, fan motors, and control circuits requiring overcurrent protection at this rating.
• ✅ Rugged Cartridge Body – Durable encapsulation for reliable performance under heat and vibration.

Technical Specifications

• Amperage: 40 Amps
• Voltage Rating: 250 Volts AC
• Interrupt Rating: 200,000 Amps (RMS Symmetrical)
• Fuse Class: RK5
• Element Type: Dual

Installation Guidance

Installation should be conducted by a licensed electrician or HVAC technician in accordance with NEC guidelines. Proper fuse sizing, coordination with upstream/downstream protective devices, and panel labeling are required to ensure compliance and optimal equipment protection.

Application Scope

The 7-CRNR40 is typically installed in fused disconnects, panelboards, and individual motor circuits where branch circuit overcurrent protection is needed. Suitable for use in commercial rooftop units, air handlers, and condenser fan circuits operating on 208/230V systems. The time-delay feature allows continued operation during equipment startup without compromising short-circuit protection.