Eaton FNM-40 Fuse - Time-delay Protection Dual Elements

Part Number: FNM-40
Manufacturer
Eaton
Part number
FNM-40

Quick Summary

The Eaton Bussmann FNM-40 fuse is a time-delay protection device designed for industrial panels and control circuits. Selecting a fuse that balances startup inrush with long-cycle reliability can challenge engineers in motor and power-distribution applications. This model emphasizes time-delay operation, dual elements for dependable overload protection, and nickel-plated endcaps that resist corrosion, with ferrule-end connections for quick, secure installation. Note: The data provided lists warranty and compliances as Not Applicable; for CE/UL/IP certifications, consult Eaton datasheets and Bussmann catalogs to confirm exact approvals for your region. With a 40 A rating at 250 V, it fits standard panel boards and minimizes nuisance trips, supporting reduced downtime and lower maintenance costs.

Product Information

Extended Description

FNM-40 Eaton: Eaton Bussmann series FNM fuse, Time-delay, 40 A, Dual, Non-indicating, Ferrule end x ferrule end, Nickel-plated bronze endcap, Standard, 250 V
Product Name
Eaton Bussmann series FNM fuse
Catalog Number
FNM-40
UPC
051712523028
EAN
5027590449564
Product Length/Depth
0.39 in
Product Height
1.44 in
Product Width
0.39 in
Product Weight
0.2 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
40 A
Voltage rating
250 V
Material
Nickel-plated bronze endcap
Number of elements
Dual
Packaging type
Standard
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Special features
Superior overload and cycling capabilities
Feature: Time-delay operation provides controlled response to startup inrush and short overload events. Business Impact: Reduces nuisance tripping in motor circuits while maintaining protection against sustained faults, improving equipment uptime and lowering maintenance costs. Application: Suitable for motor control centers, conveyors, and industrial drives where inrush currents occur regularly without compromising protection. Feature: Dual elements offer enhanced cycling endurance and reliable overload protection. Business Impact: Extends fuse life under frequent cycling, reducing replacement frequency and total cost of ownership. Application: Heavy-duty control panels and process lines with frequent duty cycles or fluctuating loads. Feature: Ferrule-end x ferrule-end connections simplify field mounting and panel integration. Business Impact: Faster, more consistent installations with secure connections that resist vibration, enabling quicker service turnarounds. Application: Standard electrical panels and equipment racks that use ferrule-style terminations. Feature: Nickel-plated bronze endcaps improve corrosion resistance and long-term contact integrity. Business Impact: Maintains low contact resistance over time, supporting stable protection in harsh environments and reducing maintenance intervals. Application: Industrial environments with exposure to humidity or contaminants. Feature: 40 A, 250 V electrical rating aligned with common industrial protection needs. Business Impact: Matches typical control circuits and branch protections in mid-range panels, allowing plug-and-play compatibility with existing Eaton Bussmann hardware. Application: Control panels, branch circuits, and machine protection where 250 V operation is standard.

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FAQs

The FNM-40 uses ferrule-end connections and nickel-plated endcaps, enabling quick, secure mounting in standard panels. Ensure panel cavities match ferrule-end fuses and verify cable ferrule sizes and torque specs per Eaton datasheets to maintain proper contact and avoid loose connections.
Yes. The time-delay design tolerates brief inrush currents typical of motor startup while still protecting against sustained overloads. For best results, place the device in the motor control circuit where overload protection is needed without nuisance tripping during startup.
The FNM-40 is part of Eaton Bussmann’s family of midget fuses. For compatible replacement parts and installation guidance, consult the Bussmann catalog no. 1007 and the Eaton datasheets listed in the provided downloads to ensure correct matching and panel integration.
The provided data marks warranty and compliances as Not Applicable, and no specific certifications are listed. For definitive CE, UL, or IP ratings, refer to the Eaton specification sheets and regional approvals in the official datasheets.
By reducing nuisance trips through time-delay operation and extending fuse life with dual elements, the FNM-40 can lower maintenance costs and downtime. Its compatibility with standard Ferrule-end terminations also speeds up installation, delivering quicker deployments and improved system reliability.