Eaton KTN-R-400 Fuse - Class RK1, 200 kA at 250 Vac
Part Number: KTN-R-400
Quick Summary
Eaton KTN-R-400 fuse is a fast-acting, current-limiting device designed to protect high-current circuits in industrial power distribution. In demanding facilities, nuisance tripping and slow fuse changes can derail production schedules. This Class RK1, 400 A fuse offers interruption ratings up to 200 kAIC at 250 VAC and 100 kAIC at 250 Vdc, with regional CE/RoHS considerations to verify per your regulatory requirements. By combining rugged construction with blade-end connections, it provides reliable protection for control panels and motor feeders. The result is reduced downtime, simplified spare parts management, and improved overall equipment efficiency across critical manufacturing processes.
Product Information
Extended Description
KTN-R-400 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 400 A, rejection style fuse, interrupting rating of 200 kA at 250 Vac
Product Name
Eaton Bussmann series KTN-R fuse
Catalog Number
KTN-R-400
UPC
051712407250
Product Length/Depth
8.63 in
Product Height
2.06 in
Product Width
2.06 in
Product Weight
1.94 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
400 A
Interrupt rating
100 kAIC at 250 Vdc 200 kAIC at 250 Vac
Voltage rating
250 Vac, 250 Vdc
Material
Melamine glass tube
Number of elements
1
Packaging type
Standard
Class
Class RK1
Connection
Blade end x blade end
Fuse indicator
Non-indicating
Special features
70/30 brass end cap
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Bussmann series KTN-R 250 V Class R fuse data sheet no. 1043
Feature: 400 A amperage rating enables protection for high-current feeders and machinery. Business Impact: Supports reliable uptime and reduces the risk of expensive, cascading faults. Application: Ideal for power distribution blocks and motor feeders in industrial facilities. Feature: Fast-acting, current-limiting performance minimizes fault energy and arcing. Business Impact: Shortens fault duration, lowers wear on conductors, and enhances personnel safety. Application: Suitable for panel protection in dynamic production lines where load surges occur.Feature: Class RK1, rejection style blade-end construction with 70/30 brass end caps. Business Impact: Fast, tool-friendly installation with solid electrical contact and reduced maintenance. Application: Common in control cabinets requiring straightforward replacement and dependable fit.Feature: Melamine glass tube with a single element design. Business Impact: Robust, heat-resistant housing supports environments with temperature variability while maintaining consistent protection. Application: Used in harsh manufacturing environments and standard control panels.Feature: 8.63 in length, 2.06 in height and 2.06 in width with 1 element. Business Impact: Known form factor simplifies spec reviews and retrofit planning. Application: Helps engineers match existing slots and blade-end connections with minimal rework.Feature: 250 VAC and 250 VDC voltage ratings with 100 kAIC at 250 Vdc and 200 kAIC at 250 Vac. Business Impact: Broad compatibility with DC and AC circuits while delivering high fault-current protection. Application: Suitable for mixed-control circuits and feeders where rigorous interrupt ratings are required.
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FAQs
The KTN-R-400 is a blade-end, Class RK1 fuse designed for standard control panels and power distribution blocks that accept RK1-class devices. Its 8.63 in length and 2.06 in width fit common enclosure footprints, and the blade-end connections allow straightforward substitution in compatible Eaton Bussmann assemblies.
The device provides 200 kAIC interruption at 250 VAC and 100 kAIC at 250 VDC, with a voltage rating of 250 VAC and 250 VDC, supporting reliable protection across both AC and DC circuits in industrial environments.
Yes. Its fast-acting current-limiting design minimizes arc energy during faults, protecting motor feeders and panels. The 400 A rating and RK1 compatibility make it a practical choice for industrial control panels and high-current motor circuits.
Regional requirements vary; the data suggests Class RK1 usage with notes on compliance. Verify CE and RoHS status via official datasheets or the RoHS Search Tool, and confirm any UL/CSA equivalents applicable in your jurisdiction to ensure full regulatory alignment.
Ensure clean, secure blade-end connections and proper torque to spec to prevent contact resistance. Use the standard packaging and mounting method to avoid vibration-induced wear, and maintain an inventory of replacement KTN-R-400 fuses for rapid field swaps, minimizing downtime.