Eaton FNQ-R-4-R1 Fuse - Class CC
Part Number: FNQ-R-4-R1
Quick Summary
The Eaton FNQ-R-4-R1 fuse provides current-limiting, high inrush time-delay protection for line circuits in industrial controls. Engineers often grapple with nuisance trips during transformer startups and uneven protection across compact panels. RoHS compliant with Class CC protection, it aligns with stringent regulatory requirements while fitting Bussmann series architectures. Its compact 1.5 in length and 0.41 in footprint simplify panel layouts, while a 4 A rating enables precise coordination with small control transformers and branch circuits—reducing spare parts, downtime, and total cost of ownership.
Product Information
Extended Description
FNQ-R-4-R1 Eaton: Eaton Bussmann series FNQ-R fuse, Current-limiting high inrush time-delay fuse, Line protection, Small control transformers, Industrial control, Branch circuits, 4 A, Class CC
Product Name
Eaton Bussmann series FNQ-R fuse
Catalog Number
FNQ-R-4-R1
UPC
051712509510
Product Length/Depth
1.5 in
Product Height
0.41 in
Product Width
0.41 in
Product Weight
0.15 lb
Warranty
Not Applicable
Compliances
Not Applicable RoHS Compliant
Type
Current-limiting high inrush time-delay fuse
Application
Line protection, small control transformers, industrial control, branch circuits
Amperage Rating
4 A
Class
Class CC
FNQ-R-4-R1~CLASS CC W/14X51 REDUCERS
FNQ-R-4-R1~CLASS CC W/14X51 REDUCERS
Bussmann series Fuseology
Eaton Specification Sheet - FNQ-R-4-R1
Current-limiting, high inrush time-delay action minimizes peak currents during startup, reducing stress on transformers and switchgear. This protective behavior translates into fewer nuisance trips and extended equipment life in demanding industrial environments. By delivering targeted protection for line circuits and industrial controls, it helps maintain consistent process uptime and safer panel operations. With a 4 A amperage rating, the FNQ-R-4-R1 enables precise fuse coordination for typical small-control transformer loads. This prevents both under-protection and unnecessary interruptions, improving overall line reliability. In practice, it supports coordinated protection schemes across branch circuits and control panels where startup inrush is predictable. Class CC construction delivers a compact yet robust protection solution, freeing valuable space in crowded panels. The small footprint simplifies retrofits and enables higher-density panel designs without sacrificing protection levels. Engineers also benefit from standardized Bussmann series compatibility, which streamlines sourcing and spare-part management. RoHS compliance ensures regulatory alignment and supports environmental responsibility in manufacturing and end-of-life scenarios. Coupled with Eaton's documented specifications, it simplifies audit trails and procurement workflows for regulated facilities. Physical dimensions—1.5 inches long with a 0.41 inch by 0.41 inch cross-section—and a modest 0.15 lb weight enable quick swaps and minimal rework during panel maintenance. The lightweight, compact form factor also reduces mounting constraints in compact control cabinets while maintaining reliable electrical performance. Designed to integrate with the Bussmann series protection family, the FNQ-R-4-R1 offers predictable performance and straightforward modeling in protection schemes. Access to the Eaton catalog and datasheet accelerates engineering validation, field service, and parts replacement when reliability matters most.
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FAQs
Install FNQ-R-4-R1 in appropriate control-panel slots using the standard Bussmann series mounting approach. Verify the 1.5 in length and 0.41 in width/height fit within denser cabinets, and ensure derating for ambient temperature and system inrush. Use the provided catalog and datasheet to confirm compatible bus connections and fuse holders.
The 4 A amperage rating aligns with typical small-control transformer inrush and running currents, enabling precise protection without nuisance tripping. The time-delay feature accommodates startup surges, while current-limiting minimizes peak currents, extending transformer life and reducing wear on upstream protection devices.
Yes, the FNQ-R-4-R1 is RoHS compliant, supporting regulatory and environmental compliance. While the data sheet emphasizes RoHS, the Class CC protection and Bussmann series compatibility provide clear industry-standard performance characteristics for certification discussions and panel commissioning.
A 4 A rating ensures the fuse clears faults without interrupting normal operation for the majority of small-load branches. This strikes a balance between preventing damage from overcurrent events and avoiding unnecessary outages in branch circuits feeding small transformers and similar loads.
FNQ-R-4-R1 offers a matched 4 A rating with Time-delay and current-limiting features in a compact Class CC package, optimizing panel space and enabling reliable starter protection for small transformers. Its RoHS compliance and Bussmann-series compatibility simplify procurement, stocking, and field service.