Eaton FRN-R-4 Fuse - Class RK5 CE
Part Number: FRN-R-4
Quick Summary
FRN-R-4 fuse from Eaton provides reliable current-limiting protection for industrial control panels. Engineers often wrestle with nuisance trips and improper coordination when protecting evolving machine circuits. This Class RK5, time-delay fuse is CE marked and built as a dual-element device with a 4 A rating and high interrupt capability, supporting up to 200 kAIC at 250 Vac and 20 kAIC at 125 Vdc. The solution offers compact, ferrule-end connections for quick installation and dependable protection for motor starters, control cabinets, and power distributions. By selecting the Bussmann series FRN-R fuse, maintenance is simplified and uptime is improved, delivering compliance, reliability, and cost-effective protection for industrial electrical systems.
Product Information
Extended Description
FRN-R-4 Eaton: Eaton Bussmann Series Class RK5 fuse, FRN-R, time-delay, dual-element, current limiting fuse, 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
UPC
051712507202
Product Length/Depth
2 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.05 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
4 A
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
Special features
Finger safe, power loss 7.27 w
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 → Business Impact → Application: The FRN-R-4’s dual-element time-delay design minimizes nuisance trips during inrush events while maintaining selective coordination in control circuits, reducing downtime and extending equipment life in automated machinery. This translates to measurable efficiency gains in packaging lines, conveyors, and machine tools where startup surges are common. Application: Use in industrial control panels and power distribution nodes to protect motors, relays, and logic circuits without compromising productivity. Feature → Business Impact → Application: A 4 A amperage rating paired with an elevated interrupt rating (200 kAIC at 250 Vac; 20 kAIC at 125 Vdc) delivers robust fault containment and reduced arc energy, enabling safer maintenance windows and lower downtime in high-current environments. Application: Suitable for control cabinets and feeder circuits within machine tools and HVAC systems. Feature → Business Impact → Application: Ferrule-end connections simplify field termination, speed up installation, and improve reliability by ensuring consistent crimps and secure wire termination. Application: Ideal for technician-friendly installations in retrofit projects and new-build automation panels. Feature → Business Impact → Application: The Class RK5, finger-safe design and non-indicating status reduce maintenance complexity while complying with standard protection schemes. Application: Routine inspections and service cycles in industrial automation environments benefit from predictable, standards-compliant protection. Feature → Business Impact → Application: Comprehensive data sheet and compatibility with Bussmann series fuse catalogs support engineering coordination and spare-part planning, lowering lifecycle costs in large facilities and multi-line plants.
Get a Quick Quote for a Eaton FRN-R-4
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton FRN-R-4?
Enquire Now
FAQs
The FRN-R-4 uses ferrule-end connections (Ferrule end x ferrule end). For reliable field termination, use appropriately sized conductors terminated with conforming ferrules and tighten per Eaton guidance to the recommended torque. This enables quick, repeatable installations in control panels and minimizes loose-term risks during maintenance.
FRN-R-4 provides an interrupt rating of 200 kAIC at 250 Vac and 20 kAIC at 125 Vdc, with a time-delay response of 8 seconds at 500% overload. Its dual-element design supports inrush tolerance and coordination with upstream protection devices, reducing nuisance tripping while maintaining fast fault interruption.
Yes. The 4 A, time-delay Class RK5 fuse is well-suited for motor starters and control circuits where inrush currents occur. The high interrupt rating supports reliable fault containment, while the RK5 family’s characteristics help coordinate with contactors and soft starters in automation lines, improving uptime and protecting drive electronics.
FRN-R-4 is CE marked, aligning with essential European conformity requirements for electrical protection devices. RoHS compliance can be verified via Eaton’s RoHS Search Tool, and reference to the Bussmann series catalog for RoHS-related documentation is available in the product downloads. This supports regulatory adherence in regulated markets and traceability for audits.
The fuse’s current-limiting, dual-element design minimizes fault energy and arc exposure, helping protect downstream components. Its compact, ferrule-based installation reduces labor time, while CE marking and standard RK5 compatibility streamline procurement and spares management. Together, these factors contribute to lower maintenance costs and higher facility uptime over the equipment’s lifecycle.