Eaton FRN-R-6-1/4 Fuse - Class RK5 Time-Delay
Part Number: FRN-R-6-1/4
Quick Summary
The Eaton FRN-R-6-1/4 fuse provides time-delay overcurrent protection for branch circuits in industrial control panels. Engineers often battle nuisance trips during motor startups and transient surges, which cause unplanned downtime and maintenance overhead. This model is part of the Class RK5 family and is CE marked, with RoHS support through Eaton's RoHS search tool to help meet regulatory requirements. The device uses ferrule-end connections for quick, secure installation and is compatible with standard Bussmann-series fuse holders. By delivering reliable protection at 250 Vac and 125 Vdc with a dual-element design, it supports safer panel designs and improved uptime for capital equipment.
Product Information
Extended Description
FRN-R-6-1/4 Eaton: Eaton Bussmann Series Class RK5 fuse, FRN-R, time-delay, dual-element, current limiting fuse, 6.25 A, non-indicating fuse, interrupting rating of 200 kA at 250 Vac and 20 kA at 125 Vdc
Product Name
Eaton Bussmann series FRN-R fuse
Catalog Number
FRN-R-6-1/4
UPC
051712507240
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.32 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
6.25A
Interrupt rating
20 kAIC at 125 Vdc 200 kAIC at 250 Vac
Response time
8 sec at 500%
Voltage rating
250 Vac, 125 Vdc
Number of elements
Dual
Packaging type
Standard
Class
Class RK5
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Fusetron FRN-R RK5 fuse data sheet for up to 60 amps No. 1019
Feature: Time-delay, dual-element construction reduces nuisance trips during motor start-ups and transient overloads, enabling smoother startups and less unplanned downtime. Benefit: Lower maintenance costs and higher line uptime in motor control and conveyor systems; Application: control panels and machine feeders where inrush is common. Feature: Ferrule-end connections enable fast, secure installation and reliable mating with standard holders; Benefit: Simplified field assembly and reduced commissioning time. Application: retrofit projects and OEM builds using common Bussmann RK5 hardware. Feature: 6.25A rating with 250 Vac / 125 Vdc capabilities provides precise protection for low- to medium-power circuits; Benefit: Avoids oversizing while delivering robust protection. Application: branch circuits feeding sensors, relays, and small motors. Feature: High interrupt ratings (200 kAIC at 250 Vac; 20 kAIC at 125 Vdc) deliver durable fault protection; Benefit: Enhanced safety margins in harsh electrical environments. Application: power distribution and equipment feeders in automation panels. Feature: Non-indicating design keeps maintenance simple and cost-effective; Benefit: Reduced complexity during inspections and faster fuse replacements. Application: field service and panel maintenance. Feature: CE marking and RoHS support ensure regulatory alignment and sustainable design; Benefit: Peace of mind for global deployments and compliant sourcing. Application: multinational facilities and OEMs needing compliant components.
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FAQs
Install the FRN-R-6-1/4 using ferrule-end terminals into compatible Bussmann RK5 fuse blocks. Ensure the block accommodates 3 inch length fuses and the ferrule-to-ferrule connection matches the device’s dual-element configuration. Verify the 6.25A rating aligns with the protected circuit and confirm correct voltage supply (250 Vac or 125 Vdc) before energizing.
The fuse is rated at 6.25A with voltage ratings of 250 Vac and 125 Vdc, and it provides 200 kAIC at 250 Vac and 20 kAIC at 125 Vdc. Its 8-second response at 500% overload helps protect downstream equipment while accommodating inrush in motors and controllers, reducing nuisance trips without sacrificing safety.
Yes, as a time-delay, dual-element RK5 fuse with high interrupt ratings, FRN-R-6-1/4 is well-suited for motor feeders and control circuits where startup surges occur. Use appropriate enclosure and fuse-housing compatibility, and ensure the amperage rating matches the motor’s full-load current to avoid nuisance trips while maintaining protection.
FRN-R-6-1/4 carries CE marking for compliance with European standards. Eaton also supports RoHS compliance via its RoHS search tool, helping users verify environmental and regulatory alignment across regions. The Class RK5 designation reflects the fuse family and performance characteristics used in industrial protection.
The dual-element, current-limiting design offers reliable protection with rapid fault clearing, helping reduce equipment wear and downtime. The non-indicating fuse simplifies replacement in dense panel layouts, while ferrule-end connections enable fast, secure maintenance, reducing commissioning time and improving overall system uptime in automation environments.