DiversiTech, 7-CRNR25, Dual Element Fuse, 25 A, 250 V, 200,000 A

DiversiTech 7-CRNR25 – 25A Dual Element Time Delay Fuse, Class RK5

The DiversiTech 7-CRNR25 is a 25-amp, dual-element time delay fuse designed for branch circuit protection in HVAC and motor-driven equipment. This RK5-class fuse offers selective overload protection by allowing momentary inrush currents typical of motor starts, while isolating sustained overloads and short-circuit faults.

Rated for 250 VAC and with an interrupting capacity of 200,000 A RMS symmetrical, the 7-CRNR25 supports applications where high fault current interruption and code-compliant protection are required. It is commonly used in motor circuits, control panels, and load centers servicing air handlers, compressors, and condenser fan motors.

Key Features

• ✅ Time Delay Fuse – Accommodates motor inrush currents without nuisance tripping during equipment startup.
• ✅ Dual-Element Design – Combines overload and short-circuit protection in a single fuse for HVAC and motor circuits.
• ✅ 200kA Interrupt Rating – Provides safe disconnection under high fault current conditions in accordance with NEC guidelines.
• ✅ RK5 Class Compliance – UL listed and compliant with Class RK5 performance standards for branch circuit protection.
• ✅ Standard Installation Form Factor – Compatible with fuse holders, pullouts, and disconnects designed for RK fuses.

Technical Specifications

• Fuse Type: Dual Element Time Delay
• Class: RK5
• Amperage: 25 A
• Voltage Rating: 250 VAC
• Interrupt Rating: 200,000 A RMS Symmetrical
• Agency Approvals: UL Listed

Installation Guidelines

For optimal protection and code compliance, this fuse should be installed by a licensed electrician or HVAC technician. Verify compatibility with the existing fuse holder and ensure proper torque is applied during installation. Fuse replacement must match both voltage and amperage ratings as specified by the equipment manufacturer.

Professional Use Case

The 7-CRNR25 is designed for continuous-duty applications in commercial and residential HVAC systems. It helps prevent damage to motors, compressors, and conductors by interrupting overcurrent conditions quickly and safely. The time delay characteristic makes it particularly well-suited for use in blower motors and compressor units with high starting currents.

Operational Advantages

• ✅ Reduces Equipment Downtime – Prevents premature tripping during startup, reducing unnecessary service interruptions.
• ✅ Code-Compliant Protection – Suitable for systems requiring UL Class RK5 time-delay fuses per NEC.
• ✅ Supports Selective Coordination – Works effectively in fuse coordination plans to isolate faults without impacting upstream devices.