Eaton KTN-R-40 Fuse - Class RK1, 250 V, 40 A
Part Number: KTN-R-40
Quick Summary
The Eaton KTN-R-40 fuse protects industrial circuits in control panels and motor drives. It helps address nuisance trips and space challenges that disrupt uptime and drive maintenance costs. Key ratings include Class RK1 classification, 250 V rating, and a 200 kA interrupting capacity, providing robust protection for high-energy systems. Its compact 3 in length and ferrule-end construction enable quick swaps in tight control cabinets, improving serviceability and field retrofit efficiency. This model delivers reliable, compliant protection with a 40 A rating suitable for standard Bussmann RK1 assemblies and a wide range of automation applications.
Product Information
Extended Description
KTN-R-40 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 40 A, rejection style fuse, interrupting rating of 200 kA at 250 Vac
Product Name
Eaton Bussmann series KTN-R fuse
Catalog Number
KTN-R-40
UPC
051712407090
EAN
5027590446198
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.13 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
40 A
Voltage rating
250 V
Material
Melamine glass tube
Number of elements
1
Packaging type
Standard
Class
Class RK1
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Special features
70/30 brass end cap
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series KTN-R 250 V Class R fuse data sheet no. 1043
Feature: Fast-acting, current-limiting design under Class RK1 topology. Business Impact: Reduces fault energy and limits damage to connected equipment, cutting downtime and repair costs. Application: Ideal for control panels and power distribution in automated lines. Feature: High interrupting rating of 200 kA at 250 VAC. Business Impact: Enhances safety in high energy fault scenarios, minimizing melt-through and cascade failures. Application: Critical for motor drives, feeders, and machine controls exposed to short circuits. Feature: Ferrule-end x ferrule-end connection with 3 in length. Business Impact: Simplifies installation, ensures reliable terminations, and accelerates field replacements. Application: Fits standard RK1 fuse assemblies in compact enclosures and control cabinets. Feature: Melamine glass tube construction with a single element. Business Impact: Delivers consistent performance under temperature and vibration, reducing false trips and maintenance intervals. Application: Suitable for harsh industrial environments where durability matters. Feature: 70/30 brass end caps and non-indicating fuse design. Business Impact: Provides robust mechanical contact and reduces false status signals, enabling maintenance planning and inventory standardization. Application: Recommended for legacy Bussmann RK1 installations and modular panel builds.
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FAQs
The KTN-R-40 is designed for Class RK1 systems and ferrule-end connections, matching standard Bussmann RK1 fuse assemblies. It fits typical control panels, motor drives, and power distribution blocks that rely on 3 in long, 0.81 in wide fuses, enabling straightforward retrofits and consistent protection across automation gear.
KTNR-40 is rated at 40 A and 250 V with a 200 kA interrupting rating at 250 VAC. It is a fast-acting, current-limiting fuse designed to quickly clear faults while protecting downstream components in automated systems.
Yes. Its fast-acting current-limiting behavior and high 200 kA interrupting rating help manage short-circuit energy in industrial power feeds, reducing damage to transformers, drives, and control circuits while maintaining uptime in automation environments.
The product is classified as Class RK1 with a 250 VAC rating and a 200 kA interrupting capacity. It is part of the Bussmann RK1 fuse family, with supporting data available through Eaton’s catalogs and data sheets; RoHS compliance information can be checked via Eaton’s RoHS tool for current status.
The KTN-R-40 uses ferrule-end terminations and a standard 3 in length, enabling quick, repeatable swaps in compact panels. Its single-element design and durable melamine glass tube support reliable operation in harsh environments, reducing maintenance frequency and inventory complexity in automation projects.