Eaton FNM-4/10 Fuse - Bussmann Series, 0.4A Time-Delay, 250V, 10 kAIC
Part Number: FNM-4/10
Quick Summary
Eaton Bussmann FNM-4/10 fuse provides reliable overcurrent protection for small circuits in control panels and electronics. Engineers often contend with nuisance trips and cycling wear in compact equipment, which a time-delay fuse helps mitigate. It is CE Marked and RoHS Compliant, ensuring regulatory and environmental standards are met. Designed for ferrule-end connections and standard 250 V systems, this dual-element device combines robust protection with predictable cycling characteristics. By pairing a compact form factor with easy installation, it supports lower total cost of ownership, reduces unplanned downtime, and improves overall equipment reliability in industrial automation and electronics assemblies. In projects requiring precise current limiting and fault tolerance, this fuse offers a dependable balance of protection and performance.
Product Information
Extended Description
FNM-4/10 Eaton: Eaton Bussmann series FNM fuse, Time-delay, 0.4 A, Dual, Non-indicating, Ferrule end x ferrule end, 35 AIC at 250 Vac, 10 kAIC at 125 Vac, Nickel-plated bronze endcap, Standard, 250 V
Product Name
Eaton Bussmann series FNM fuse
Catalog Number
FNM-4/10
UPC
051712520041
EAN
5027590449557
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
CE Marked RoHS Compliant
Amperage Rating
0.4 A
Interrupt rating
10 kAIC at 125 Vac 35 AIC at 250 Vac
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
FNM-4/10~FNM-4-10~BUSS MIDGET FUSE
FNM-4/10~FNM-4-10~BUSS MIDGET FUSE
Bussmann series Fuseology
Eaton Specification Sheet - FNM-4/10
Feature: Time-delay fuse with a 0.4 A rating. Business Impact: tolerates brief surges without tripping, helping keep equipment running during startup sequences and inrush events; reduces unplanned downtime and improves line efficiency. Application: ideal for small relays, signal transformers, and low-current control circuits in industrial automation panels. Feature: Dual-element design and ferrule-end connections; Business Impact: delivers reliable short-circuit protection while minimizing nuisance alarms; reduces maintenance for indicator LEDs and related cabinet hardware. Application: fits standard ferrule-end fuse holders for rapid field upgrades in existing control cabinets. Feature: 250 V rating with 35 AIC at 250 V and 10 kAIC at 125 V; Business Impact: provides high fault current protection across loads while meeting essential safety margins; Application: suitable for power distribution trunks and modular panels in manufacturing lines. Feature: Nickel-plated bronze endcaps and compact form factor; Business Impact: improves corrosion resistance and simplifies wiring in tight spaces; Application: retrofit for space-constrained control panels. Feature: CE Marked and RoHS compliant packaging; Business Impact: streamlines procurement and regulatory compliance; Application: ideal for global automation projects requiring approved components.
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FAQs
The FNM-4/10 uses ferrule-end connections and a standard packaging format, making it compatible with common ferrule-end fuse holders found in many control panels. Its compact dimensions (0.39 in by 0.39 in cross-section, 1.44 in height) support easy mounting in tight enclosures. Ensure correct voltage rating (250 V) and confirm space for dual-element devices to avoid obstruction or overheating.
Key specs include a 0.4 A current rating with time-delay capability, 250 V voltage rating, and interrupt ratings of 35 AIC at 250 V and 10 kAIC at 125 V. The device is a dual-element fuse designed to tolerate short surges while protecting load circuits, making it suitable for panels with inrush-heavy components.
Yes. The time-delay characteristic and dual-element design enable the fuse to withstand inrush currents typical of small motors and relay coils without nuisance tripping. This reduces downtime and maintenance while providing robust protection for control circuitry, transformers, and related loads in automation environments.
The FNM-4/10 is CE Marked and RoHS Compliant, aligning with essential safety and environmental standards. While not all regional certifications are listed, these markings cover broad regulatory expectations for industrial electrical components used in global applications.
Beyond basic protection, the FNM-4/10 delivers lower total cost of ownership through reduced nuisance trips, extended load life due to controlled fault tolerance, and simpler procurement thanks to standard packaging and global compliance. Its compact form factor also supports denser panel layouts and faster field replacements in manufacturing lines.