Eaton FRN-R-40ID Fuse - RK5 Class, 40A, 250Vac/125Vdc
Part Number: FRN-R-40ID
Quick Summary
The Eaton FRN-R-40ID fuse protects motor and control circuits in industrial power systems. Nuisance tripping and downtime from aging fuses can disrupt production and drive maintenance costs. The CE marking supports European safety compliance, and the device follows the Class RK5 standard for branch-circuit protection. Ideal for Bussmann series applications needing time-delay, dual-element protection at 250 Vac / 125 Vdc, it delivers reliable, repeatable outcomes for modern automation environments. This combination reduces spare parts, supports predictive maintenance programs, and simplifies replacement with standard ferrule-end connections. With optional indicator and finger-safe design, operators can quickly verify status and comply with safety requirements.
Product Information
Extended Description
FRN-R-40ID Eaton: Eaton Bussmann Series Class RK5 fuse, FRN-R, time-delay, dual-element, current limiting fuse, 40 A, 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-40ID
UPC
051712204446
Product Length/Depth
0.81 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.12 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
40 A
Interrupt rating
20 kAIC at 125 Vdc 200 kAIC at 250 Vac
Response time
10 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 With Indicator
Special features
Finger safe
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
Time-delay, dual-element design provides selective protection to manage motor inrush and reduces nuisance trips. The FRN-R-40ID is a 40 A fuse rated for 250 Vac and 125 Vdc operation, translating into reliable protection for feeders and control circuits in automation panels. High interrupt ratings of 200 kAIC at 250 Vac and 20 kAIC at 125 Vdc ensure fast, safe fault clearing in even large installations, which improves uptime and protects drives, relays, and switches in drives and line circuits. RK5 class construction and ferrule-end connections deliver straightforward installation and compatibility with standard Bussmann RK5 holders, while standard packaging and finger-safe design ease cabinet assembly and worker safety. The 0.81 in compact form factor and 0.12 lb weight support dense panel layouts, and the non-indicating or indicator options let operators quickly confirm status without sacrificing enclosure space. CE marking confirms European compliance, and procurement teams benefit from consistent protection across automation cabinets and distribution panels, reducing complexity and inventory.
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FAQs
FRN-R-40ID is well suited for motor protection, drives, and switchgear in industrial panels. Its time-delay, dual-element design handles inrush during motor startup while maintaining robust protection during faults. With 40 A rating and 250 Vac / 125 Vdc operation, it supports both AC and DC control circuits, and its RK5 class and ferrule-end connections ensure compatibility with standard Bussmann RK5 holders.
Install FRN-R-40ID using its ferrule end x ferrule end configuration into a compatible Bussmann RK5 fuse holder. Ensure the holder is rated for 40 A and the system voltage (250 Vac / 125 Vdc). Align ferrule ends securely, then close the enclosure and verify clearance. The design supports straightforward replacement in standard panel layouts, reducing downtime during maintenance.
Key ratings include 40 A amperage, 250 Vac / 125 Vdc voltage rating, 200 kAIC interrupt rating at 250 Vac, and 20 kAIC at 125 Vdc. The fuse is time-delay (40 A) with a 10-second response characteristic at 500% overload, making it suitable for controlled fault clearing in motor and drive circuits.
Yes, FRN-R-40ID is CE marked, indicating compliance with European safety standards. For broader regulatory considerations, RoHS information is accessible via Eaton's RoHS tools, helping procurement confirm environmental compliance while maintaining consistent RK5 protection across the fleet.
FRN-R-40ID features a compact form factor with 0.81 in length, 0.81 in height, and 0.81 in width, weighing about 0.12 lb. It uses ferrule-end connections and standard packaging, enabling easy integration into dense control cabinets and switchgear while supporting finger-safe handling and straightforward replacement in routine maintenance.