Eaton FRN-R-4/10 Fuse - Class RK5, 0.4 A, 200 kAIC
Part Number: FRN-R-4/10
Quick Summary
FRN-R-4/10 fuse from Eaton Bussmann provides current-limiting protection for control panels and machine circuits. Designers and procurement teams often face nuisance trips, downtime from motor inrush, and costly fuse replacements. This CE-marked, Class RK5 device combines time-delay operation with dual-element protection to balance fast fault clearing and controlled inrush. Its compact ferrule-end, finger-safe design simplifies panel wiring and maintenance, helping reduce installation time and inventory costs across multiple lines. Relying on Bussmann series data sheets and catalogs, engineers can spec compatible fuses quickly, enabling standardization across multi-site facilities and ensuring consistent protection in automation ecosystems.
Product Information
Extended Description
FRN-R-4/10 Eaton: Eaton Bussmann Series Class RK5 fuse, FRN-R, time-delay, dual-element, current limiting fuse, 0.4 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-4/10
UPC
051712507042
EAN
5027590426275
Product Length/Depth
0.56 in
Product Height
2 in
Product Width
0.56 in
Product Weight
0.5 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
0.4 A
Interrupt rating
200 kAIC at 250 Vac 20 kAIC at 125 Vdc
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
Special features
Finger safe
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Fusetron FRN-R RK5 fuse data sheet for up to 60 amps No. 1019
Feature: Dual-element, time-delay design within the RK5 class delivers selective fault clearing while tolerating brief motor inrush. Business impact: reduces nuisance trips, minimizes downtime, and extends the life of upstream contactors and drives. Application: ideal for motor starters, PLC power rails, and branch circuits in automated equipment where inrush is common. Paragraph two continues: Feature: 0.4 A amperage rating at 250 Vac delivers precise protection for small-control circuits and sensing lines. Business impact: prevents nuisance blows during normal operation and reduces spare part usage. Application: control panels and sensing circuits in automation equipment where compact protection is essential. Paragraph three: Feature: 200 kAIC interrupt rating at 250 Vac and 20 kAIC at 125 Vdc ensures high fault current protection in industrial environments. Business impact: robust safety margin for feeders and distribution panels, improving uptime and protecting personnel. Application: industrial control panels, machine controllers, and powered distribution units in manufacturing lines. Paragraph four: Feature: Ferrule end x ferrule end connections with finger-safe housing and non-indicating design support safe installation and straightforward maintenance. Business impact: simplifies replacement, reduces panel space requirements, and lowers inspection overhead. Application: standard panel wiring and Eaton Bussmann compatible assemblies. Paragraph five: Feature: Class RK5 designation with CE marking indicates compliance with regional standards and broad catalog cross-references. Business impact: enables streamlined procurement and easier stocking through Bussmann Full Line Catalog and compatible data sheets. Application: design engineers seeking reliable, standardized fuses for automation projects and multi-site deployments.
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FAQs
FRN-R-4/10 uses ferrule-end connections and is designed for Class RK5 protection in standard control panels. It fits Eaton Bussmann RK5 assemblies and is compatible with the FRN-R RK5 fuse family, simplifying stocking and replacements across multi-site automation projects. Ensure proper ferrule sizing and secure termination with standard ferrule crimping tools.
FRN-R-4/10 is rated at 0.4 A with a voltage rating of 250 Vac (and 125 Vdc). It provides a 200 kAIC interrupt rating at 250 Vac and 20 kAIC at 125 Vdc. The fuse is time-delay, dual-element, and non-indicating, offering balanced protection for circuits that experience brief inrush without sacrificing safety.
Yes. The dual-element, time-delay design tolerates motor inrush while still protecting downstream circuitry. Its 0.4 A rating and 250 Vac operation are well-suited for small-control circuits feeding motor starters and drives, helping minimize nuisance trips and unplanned downtime in automated machinery.
FRN-R-4/10 is CE marked and belongs to the Class RK5 family, featuring a finger-safe, non-indicating design. These certifications support regional compliance for industrial panels and help with cross-referencing in standard catalogs. Always verify latest datasheets for any additional compliance listings applicable to your region.
The fuse’s standard ferrule ends and non-indicating housing simplify replacement and reduce maintenance overhead. Its high interrupt rating protects equipment, reducing repair costs after faults. Standardization within the Bussmann RK5 family enables bulk procurement, lower spare-part variety, and faster onboarding across multi-site facilities, delivering measurable uptime and inventory efficiency gains.