Eaton NOS-40 Fuse - 50 kAIC at 600 Vac
Part Number: NOS-40
Quick Summary
The Eaton NOS-40 fuse protects electrical circuits in general-purpose power applications. Engineers often struggle to pair a fuse with the required interrupt rating while fitting compact control panels. CE marking confirms European safety compliance, and the NOS-40 belongs to Eaton’s Class H / Class K5 family, supporting standardization and interchangeability. Its ferrule-end connections and pin-indicating feature simplify field installation and diagnostics. With a 40 A rating and a 50 kAIC interrupt rating at 600 Vac, it helps reduce spare parts and downtime while delivering reliable protection for automation gear.
Product Information
Extended Description
NOS-40 Eaton: Eaton Bussmann Series Class K5 fuse, NOS, general purpose, non-current-limiting fuses, 40 A, one-time fuse, interrupting rating of 50 kA at 600 Vac
Product Name
Eaton Bussmann series NOS fuse
Catalog Number
NOS-40
UPC
051712310406
Product Length/Depth
1.6 in
Product Height
5.5 in
Product Width
1.6 in
Product Weight
0.25 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
40 A
Interrupt rating
50 kAIC at 600 Vac
Voltage rating
600 V
Packaging type
Standard
Class
Class H Class K5
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Quantity
10
Special features
Pin-indicating
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Class H (K) Fuses Data Sheet no. 1030
Feature describes a 40 A, non-current-limiting fuse that provides reliable general protection; the business impact is predictable protection for heavy-duty automation loads with minimal nuisance tripping; the application is general-purpose circuits in control panels. The 50 kAIC interrupt rating at 600 Vac delivers rapid fault isolation, reducing arc energy and downstream damage; this supports high-reliability equipment in manufacturing lines, robotics, and packaging equipment. Ferrule-end x ferrule-end terminals enable quick, secure field wiring; the business impact is faster installation, easier maintenance, and lower commissioning costs; suitable for standard Bussmann-series holders and common industrial panels. Pin-indicating capability simplifies status checks during routine maintenance, reducing downtime and misdiagnosis in live environments. The packaging of ten units per purchase reduces stocking complexity and ensures consistent availability for panel builders and repair technicians.
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FAQs
NOS-40 uses ferrule-end terminations, with a compact 1.6 in length and 1.6 in width, and a height of 5.5 in. It ships in packs of 10 and weighs about 0.25 lb per unit. Connectors are ferrule-to-ferrule, designed for quick, secure wiring in standard fuse holders used for Class H and Class K5 fuses. The pin-indicating feature helps confirm status during maintenance.
NOS-40 is rated for 40 A continuous operation with an interrupt rating of 50 kAIC at 600 Vac. Its voltage rating is 600 V, making it suitable for general-purpose protection in power distribution and automation panels. This non-current-limiting fuse is intended for general protection, not selective fault current limiting in high-speed systems.
Yes, NOS-40 is designed for general protection in control panels and automated equipment. Its Class H / Class K5 designation aligns with common Bussmann-series fuse families, ensuring compatibility with standard housings and replacement parts. The 40 A rating and 50 kAIC interrupt rating support reliable protection without excessive nuisance tripping in typical automation loads.
NOS-40 carries CE marking, indicating compliance with European safety requirements. It belongs to Eaton’s Bussmann NOS fuse family (Class H / K5), providing a recognized framework for interchangeability in European and global installations. No other certifications are listed in the provided data, so CE marking is the primary accreditation cited here.
NOS-40 is a one-time, non-indicating fuse designed to protect circuits without re-closing after a fault. In the event of a fault, the device must be replaced. The pin-indicating feature aids quick fault verification, reducing troubleshooting time. Stocking a 10-pack ensures quick replacements for panel builders and maintenance teams, minimizing downtime during scheduled outages or unexpected faults.