Eaton FNQ-1-1/4 Fuse - 10 kAIC at 500V for motor protection
Part Number: FNQ-1-1/4
Quick Summary
Eaton FNQ-1-1/4 fuse protects motor circuits by interrupting faults during startup. In demanding equipment bays, nuisance trips slow production and drive maintenance costs; this time-delay fuse helps keep lines running. The device carries CE marking and RoHS compliance, with a 500 V rating and a 10 kAIC interrupt capacity to meet global safety requirements. Compact ferrule-end design and nickel-plated endcaps simplify installation in tight panels, while standard packaging supports scalable deployment across multiple machines. This combination helps OEMs and maintenance teams reduce downtime while maintaining compliance with motor protection standards. Engineers also benefit from easy substitution within Bussmann legacy fuse blocks, enabling rapid modernization without rewiring.
Product Information
Extended Description
FNQ-1-1/4 Eaton: Eaton Bussmann series FNQ fuse, Time-delay, Motor control transformers, Circuits with in-rush currents, 1.25 A, Non-indicating, Ferrule end x ferrule end, 10 kAIC at 500 Vac, Nickel-plated bronze endcap, Standard, 500 V
Product Name
Eaton Bussmann series FNQ fuse
Catalog Number
FNQ-1-1/4
UPC
051712786140
EAN
5027590060424
Product Length/Depth
0.41 in
Product Height
1.5 in
Product Width
0.41 in
Product Weight
0.175 lb
Warranty
Not Applicable
Compliances
CE Marked RoHS Compliant
Amperage Rating
1.25 A
Interrupt rating
10 kAIC at 500 Vac
Voltage rating
500 V
Material
Nickel-plated bronze endcap
Packaging type
Standard
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Special features
Non-indicating
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - FNQ-1-1/4
FNQ-1-1/4~FNQ-1-1-4~BUSS MIDGET FUSE
Time-delay operation is the core feature, allowing the FNQ-1-1/4 to endure short inrush spikes typical of motors, pumps, and transformers without tripping unnecessarily. This behavior translates into lower nuisance trips, fewer unplanned stops, and improved line uptime in production lines. The fuse is particularly effective in applications with inrush from transformers or VFDs, conveyors, and packaging equipment where controlled inrush shapes the protection curve. In practice, engineers see smoother start-ups and longer motor life. The 1.25 A amperage with a 10 kAIC interrupt rating at 500 Vac provides reliable protection without sacrificing startup performance, safeguarding small motors and control circuits in busy facilities. This enables safer commissioning and reduces the odds of costly equipment damage during startup surges. The ferrule-end x ferrule-end connection, coupled with nickel-plated bronze endcaps, delivers robust terminals and quick, vibration-resistant installations in busy control panels. Non-indicating design keeps costs down while streamlining replacement in legacy fuse blocks. The FNQ-1-1/4 is CE Marked and RoHS compliant, and its 500 V rating aligns with common industrial distributions, making it a solid choice for global supply chains. Standard packaging supports scalable deployment across multiple machines, while the compact form factor simplifies retrofits and upgrades in tight motor-control cabinets.
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FAQs
FNQ-1-1/4 uses ferrule-end connections with nickel-plated endcaps for robust, vibration-resistant terminals. Install in standard Bussmann-style fuse blocks or cabinets designed for ferrule-end fuses, ensuring adequate clearance and proper alignment. The non-indicating design means you should track faults via external diagnostics or system indicators rather than relying on a fuse indicator light.
Time-delay fuses like FNQ-1-1/4 tolerate short surges encountered during motor startup, preventing unnecessary trips that can stall production. This maintains uptime for equipment powered by motors or transformers while still delivering fast protection against sustained overcurrents. It’s especially beneficial in applications with VFDs, pumps, and conveyor systems that experience brief inrush spikes.
Yes, FNQ-1-1/4 is rated at 500 V and provides a 10 kAIC interrupt capacity, making it appropriate for motor control circuits and transformer protection in 500 V systems. For transformer-protected feeders, ensure a current rating that matches the transformer load and coordination with upstream protections to maintain selectivity and fault clearing time.
The FNQ-1-1/4 is CE marked and RoHS compliant, signaling conformity with European safety, health, and environmental requirements. These certifications support global procurement, help satisfy regulatory obligations in many markets, and facilitate risk management in certified industrial installations. They are particularly important when supplying multinational facilities or OEMs with strict supplier standards.
The non-indicating design reduces part complexity and maintenance costs by limiting the need for fuse status diagnostics on a daily basis. Its robust ferrule-end connections and nickel-plated endcaps enable quick replacements and reliable long-term operation, lowering downtime and repair time during scheduled maintenance. Overall, the FNQ-1-1/4 contributes to lower total cost of ownership in motor-driven systems.