Cooper Bussmann FRN-R-150 Time Delay Fuse 150A RK5

Product Description

The COOPER BUSSMANN FRN-R-150 is a Class RK5 cartridge-style time delay fuse rated at 150 amps. It is designed for general-purpose overcurrent protection in industrial and commercial electrical distribution systems. The time delay characteristic allows the fuse to ride through temporary inrush currents — such as motor startup loads — without nuisance opening, while still providing fast response to sustained fault conditions. A dual-element internal construction supports this behavior. Licensed electricians and electrical contractors install this fuse type in disconnect switches, motor control centers, and panelboards where RK5 fusing is specified.

The FRN-R-150 is suited for AC and DC electrical circuits requiring RK5-class overcurrent protection. Its bolt-on mount type makes it compatible with standard fuse block and disconnect hardware designed for cartridge fuse bodies of this class. The 20 kA interrupting rating at DC 200 volts RMS makes it appropriate for applications with significant available fault current. It is commonly used in light industrial, commercial HVAC, and pump motor circuits where time delay fusing is required by design or code.

Key Features

• 150A continuous current rating with Class RK5 time delay characteristics
• Dual-element construction tolerates motor inrush without nuisance tripping
• 20 kA interrupting rating at DC 200 volts RMS
• Bolt-on mount type for use with standard RK5 fuse blocks and disconnects
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5
• Cartridge body with 39.6 mm diameter and 7.125 inches overall length

Compatibility

Designed for use in Class RK5 fuse holders, disconnects, and motor control equipment requiring a 150A time delay cartridge fuse with a 39.6 mm diameter body and bolt-on mounting.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. Always de-energize and lockout/tagout the circuit before removing or installing fuses. Verify that the fuse holder or disconnect is rated for Class RK5 cartridge fuses at the appropriate amperage and voltage before installation. Do not substitute a fuse of a different class, amperage, or timing characteristic without engineering review.