Eaton NOS-4 Fuse - 50 kAIC at 600 Vac, Class K5
Part Number: NOS-4
Quick Summary
The Eaton Bussmann NOS-4 fuse is a general-purpose, non-current-limiting device that provides reliable overcurrent protection for electrical panels and industrial equipment. Engineers often struggle to balance protecting costly circuits with minimizing nuisance trips and downtime. This design is CE marked and aligns with the Bussmann Class K5/H fuse family standards, supporting safe, compliant operation. In practice, the 4 A NOS fuse enables consistent protection without over-tripping, delivering value in control panels and motor circuits. The combination of a 50 kAIC interrupt rating at 600 Vac and a compact 5 inch length makes installation straightforward in crowded enclosures, improving serviceability for technicians. Edge-case note: this is a non-current-limiting fuse, suitable for general protection but not for fast-responding inrush suppression.
Product Information
Extended Description
NOS-4 Eaton: Eaton Bussmann Series Class K5 fuse, NOS, general purpose, non-current-limiting fuses, 4 A, one-time fuse, interrupting rating of 50 kA at 600 Vac
Product Name
Eaton Bussmann series NOS fuse
Catalog Number
NOS-4
UPC
051712310086
EAN
5027590173988
Product Length/Depth
5 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.073 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
4 A
Interrupt rating
50 kAIC at 600 Vac
Voltage rating
600 V
Packaging type
Standard
Class
Class K5 Class H
Fuse indicator
Non-indicating
Quantity
10
Special features
Pin-indicating
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Bussmann series Fuseology
Bussmann series Class H (K) Fuses Data Sheet no. 1030
Feature: 4 A amperage rating with a 50 kAIC interrupt rating at 600 Vac. Business impact: Ensures fast, clean fault interruption without overstressing upstream components, reducing arc exposure and downtime. Application: Best suited for general protection of electrical panels, control cabinets, and small-to-medium power circuits in industrial settings. Feature: Pin-indicating capability complements a non-indicating fuse indicator by enabling quick status checks in the field. Business impact: Cuts maintenance time and avoids unnecessary fuse removal, boosting overall equipment reliability. Application: Field service in electrical cabinets and control panels where rapid verification is valuable. Feature: Compact footprint—5 in length and 0.81 in cross-section—with light 0.073 lb weight. Business impact: Space-saving design that simplifies retrofits and upgrades in crowded enclosures. Application: Panel upgrades and new installations in tighter electrical rooms. Feature: CE Mark compliance and compatibility with the Bussmann Series Class K5/H fuse family. Business impact: Ensures regulatory alignment for EU markets and streamlined sourcing from a unified catalog. Application: Global deployments across industrial automation projects. Feature: Packaging quantity of 10 per unit and standard packaging. Business impact: Efficient stocking and replacements for maintenance teams, reducing downtime. Application: Spare parts planning for mid-size distribution panels. Objection handling: As a non-current-limiting fuse, it suits general protection but not fast inrush mitigation; pair with appropriate coordination and time-current curves for motor loads.
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FAQs
NOS-4 is designed for standard Bussmann/Fuse clips used in electrical panels. It measures 5 inches long with a 0.81 inch footprint, matching common Class K5/H fuse holders. When wiring, ensure correct clip rating for 600 Vac systems and observe the device’s non-indicating body unless the pin-indicating option is used. This reduces rework during cabinet retrofits.
NOS-4 is a 4 A, non-current-limiting fuse with a 50 kAIC interrupt rating at 600 Vac. These specs provide robust fault interruption for general-purpose circuits while maintaining simple coordination with nearby protection devices. The rating is suitable for control panels, light-to-medium industrial loads, and standard distribution circuits.
Yes, when used within its intended scope. The 4 A NOS-4 fuse offers reliable general protection with a high 50 kAIC interrupt rating at 600 Vac, making it suitable for motor control panels and machining environments where nuisance-free protection and straightforward replacement are valued. For motor starts with high inrush, ensure proper time-current coordination and consider alternatives if needed.
NOS-4 carries CE marking, indicating compliance with EU safety directives. The device belongs to the Bussmann Series Class K5/H family, aligning with global protection standards and facilitating cross-border procurement. For global deployments, verify local electrical codes and any additional regional approvals required for specific machinery or panels.
The NOS-4 design supports quick field replacement thanks to its compact form and pin-indicating option, reducing downtime during fuse changes. With a high interrupt rating and reliable non-current-limiting protection, maintenance cycles can be extended and service windows shortened, yielding lower total cost of ownership in mid-size automation and control applications.