Diversitech 7CRNR100 RK5 Dual Element Time Delay Fuse 100A 250V

Product Description

The DIVERSITECH 7CRNR100 is an RK5 class dual-element time-delay fuse rated at 100 amps and 250 volts. It provides overcurrent protection in HVAC and commercial electrical systems where both motor-start inrush tolerance and sustained overload protection are required. The dual-element design separates the overload-sensing element from the short-circuit-sensing element, allowing the fuse to ride through normal motor starting currents without nuisance opening while still clearing faults quickly. Licensed electricians and HVAC technicians install this fuse in disconnect boxes and fused load centers serving compressors, air handlers, and other motor-driven equipment.

This fuse is suited for residential and commercial HVAC applications where RK5-class fusing is specified. Typical installations include fusible disconnect switches serving condensing units, rooftop units, and other motor loads that draw significant inrush current at startup. The 250-volt rating covers standard single-phase and three-phase branch circuits within that voltage class. Verify the fuse class, amperage, voltage rating, and holder compatibility before installation to ensure the fuse meets the system protection requirements and applicable electrical code.

Key Features

• RK5 class dual-element design tolerates motor-start inrush while protecting against sustained overloads and short circuits
• 100-amp amperage rating for high-capacity branch circuit and disconnect applications
• 250-volt rating covers standard single-phase and three-phase circuits within that class
• Time-delay characteristic reduces nuisance trips on motor-driven HVAC equipment
• Drop-in replacement form factor for existing RK5-class fuse holders and disconnect switches

Compatibility

Designed as an OEM-style replacement for RK5-class fuse holders and fusible disconnects rated for 100-amp, 250-volt service in HVAC and commercial electrical installations.

Installation Notes

Installation must be performed by a licensed electrician or qualified HVAC technician in accordance with the National Electrical Code (NEC) and applicable local codes. Always open and lock out the upstream disconnect and verify the circuit is de-energized with a calibrated meter before removing or installing fuses. Confirm the fuse holder is rated for RK5-class fuses and that the ampacity and voltage rating of the fuse match the circuit and equipment nameplate requirements. Never replace a fuse with one of a higher amperage rating than specified by the equipment manufacturer or the overcurrent protection design.

Technical Specifications

• Fuse Class: RK5
• Fuse Type: Dual Element Time Delay
• Amperage Rating: 100 amps
• Voltage Rating: 250 volts

Standard Information

• Brand: DIVERSITECH
• Manufacturer Part Number: 7CRNR100