Eaton KTN-R-90 Fuse - Class RK1, 200 kAIC at 250 Vac
Part Number: KTN-R-90
Quick Summary
Eaton Bussmann KTN-R-90 fuse delivers fast-acting protection for control panels and motor circuits. Engineers often grapple with nuisance trips and slow fault isolation that drive downtime and maintenance costs. Catalog data for this entry lists Not Applicable for warranty and compliances, with RoHS status verifiable via Eaton’s RoHS tool; explicit CE/SIL/IP certifications are not shown here. With a 90 A rating, 200 kAIC interrupt at 250 Vac, and a compact 5.88 in length, this RK1 fuse provides reliable electrical protection in industrial environments while supporting standard Bussmann series compatibility.
Product Information
Extended Description
KTN-R-90 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 90 A, rejection style fuse, interrupting rating of 200 kA at 250 Vac and 100 kA at 250 Vdc
Product Name
Eaton Bussmann series KTN-R fuse
Catalog Number
KTN-R-90
UPC
051712407151
Product Length/Depth
5.88 in
Product Height
1.06 in
Product Width
1.06 in
Product Weight
0.3 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
90 A
Interrupt rating
200 kAIC at 250 Vac 100 kAIC at 250 Vdc
Voltage rating
250 Vac, 250 Vdc
Number of elements
1
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
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 RK1 design. Business Impact: Rapid fault clearance minimizes damage to downstream equipment and reduces downtime during faults. Application: Ideal for control panels and motor feeders in automation systems. Feature: High interrupt rating of 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc. Business Impact: Superior short-circuit protection limits arc energy and protects buswork in high-energy lines. Application: Suitable for distribution and motor circuits with heavy inrush. Feature: Rejection-style, single-element construction. Business Impact: Prevents incorrect fuse installation and simplifies field replacements, improving maintenance efficiency. Application: Fits standard Bussmann/Eaton fuse blocks in automation cabinets. Feature: Physical compatibility: 5.88 in length, 1.06 in width, 1.06 in height, weight 0.3 lb. Business Impact: Easy to handle and install in compact enclosures; supports streamlined panel design. Application: Standard LV branch circuits and machine controls. Feature: Non-indicating indicator. Business Impact: Requires meter verification after replacement, reducing false sense of inspection; improves fault tracing accuracy. Application: Industry-grade protection in rugged environments. Industry context: The KTN-R-90 aligns with class RK1 protective schemes used in OEM panels and retrofit projects, delivering predictable coordination with upstream protection devices and downstream contactors, while enabling reliable performance in diverse temperature and load conditions.
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FAQs
The KTN-R-90 is a one-element, rejection-style RK1 fuse with standard dimensions (5.88 in length, 1.06 in width, 1.06 in height) designed to fit Bussmann/Eaton fuse blocks in typical LV industrial panels. Ensure the holder is rated for 90 A and 250 Vac/DC if used in mixed circuits.
KTN-R-90 provides 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc. This high interrupt capacity is crucial for safely clearing large fault currents, protecting upstream transformers, busbars, and downstream devices from arc flash and damage.
Yes, the fuse carries a 250 Vdc rating with 100 kAIC at 250 Vdc, making it suitable for DC feeder protection in appropriate motor drive and control circuits. Verify motor inrush, controller compatibility, and enclosure venting for safe operation.
Official catalogs and data sheets are available, including Low Voltage Branch Circuit Fuse Chapter PDFs and the 1043 Bussmann data sheet. A RoHS verification tool is also provided to confirm environmental compliance.
Length 5.88 in, width 1.06 in, height 1.06 in, weight 0.3 lb; single-element, standard packaging, non-indicating fuse. These specs aid in enclosure planning and field substitutions.