Eaton KWN-R-40 Fuse - Class RK1 Non-indicating
Part Number: KWN-R-40
Quick Summary
KWN-R-40 is a fast-acting fuse used to protect electrical circuits in industrial control panels and equipment rooms. Engineers often confront nuisance trips and the challenge of finding a drop-in device that fits a standard RK1 protection scheme. This fuse delivers a 40 A rating with a non-indicating design to minimize visual clutter inside crowded enclosures. Its compact 3 in length and 0.81 in cross-section simplify panel layouts, while predictable interrupting performance supports uptime and maintenance efficiency. For procurement teams, the Bussmann series fuse offers straightforward stocking and reliable protection across multiple projects.
Product Information
Extended Description
KWN-R-40 Eaton: Eaton Bussmann series KWN-R fuse, 40 A, Class RK1, Non-indicating, Standard
Product Name
Eaton Bussmann series KWN-R fuse
Catalog Number
KWN-R-40
UPC
051712407601
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.11 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
40 A
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
KWN-R-40~LIMITRON FAST ACTING FUSE
KWN-R-40~LIMITRON FAST ACTING FUSE
Bussmann series Fuseology
Eaton Specification Sheet - KWN-R-40
Feature: Fast-acting protection with a 40 A rating. Business Impact: Rapid interruption minimizes fault damage and downstream downtime, improving line reliability in critical processes. Application: Motor drives and control circuits in assembly lines benefit from controlled fault energy and faster recovery. Feature: Class RK1 designation. Business Impact: Aligns with industry protection schemes and standard fuse catalogs, reducing engineering validation time. Application: Suitable for industrial control panels requiring RK1-class devices in electrical protection schemes. Feature: Non-indicating fuse indicator. Business Impact: Reduces panel visual clutter, allowing technicians to focus on active indicators and maintenance workflows. Application: Dense control cabinets and switchgear assemblies where quick visual assessment is needed. Feature: Standard packaging and 3 in length, 0.81 in width/height. Business Impact: Simplifies installation and compatibility with existing fuse blocks, minimizing field adjustments. Application: Retrofit and new panel builds where space constraints are present. Feature: Compatibility with Bussmann series fast-acting fuses. Business Impact: Streamlines spare parts management and procurement, reducing inventory complexity. Application: Large automation facilities with multiple protection points across machines and lines.
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FAQs
The KWN-R-40 fuse protects electrical circuits within industrial control panels and equipment rooms, particularly where motor drives and control circuits require reliable fast-acting protection. Its 40 A rating and RK1 class align with common protection schemes, supporting uptime in manufacturing and process environments.
Install the KWN-R-40 in compatible fuse holders that support RK1 fast-acting fuses. Ensure the holder matches the 3 in length and 0.81 in width/height profile. Verify correct amperage rating (40 A) and replace only with the same model to maintain protection performance and panel integrity.
Yes. The 40 A, fast-acting KWN-R-40 is designed for motor control circuits and protection points within industrial panels. Its Class RK1 designation supports standard circuit-protection criteria, enabling predictable fault interruption and streamlined maintenance planning.
The provided data does not list specific certifications. When sourcing, confirm certifications such as UL/CSA/CE with Eaton’s datasheets or catalog, and verify compatibility with your site’s compliance requirements to ensure fit-for-purpose protection in your application.
Using the KWN-R-40 can reduce downtime due to its reliable fast-acting protection and straightforward replacement. Standardized sizing and compatibility with Bussmann series spares simplify procurement, lowering inventory costs and improving overall maintenance efficiency across multiple lines and facilities.