Eaton KTN-R-300 Fuse - Class RK1, 200 kAIC at 250 Vac
Part Number: KTN-R-300
Quick Summary
The Eaton KTN-R-300 fuse protects power distribution and motor circuits as a Class RK1 fast-acting current-limiting device. Nuisance trips and downtime in demanding industrial environments are common pain points this device helps mitigate. Formal certifications such as CE or UL are not listed in this data; verify regional approvals via Eaton datasheets. With a 300 A rating and high interrupt capability, it supports reliable protection in panels, switchgear, and motor control. Its RK1 class and compact form simplify integration with standard fuse blocks. Together, these attributes help reduce maintenance costs and maximize plant uptime. Engineered for rugged industrial environments, it delivers predictable performance under varying temperatures.
Product Information
Extended Description
KTN-R-300 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 300 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-300
UPC
051712407236
Product Length/Depth
8.63 in
Product Height
2 in
Product Width
2 in
Product Weight
2.07 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
300 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
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
The fast-acting, current-limiting design delivers rapid fault clearing, reducing arc energy and downstream equipment damage. This translates to lower repair costs and safer, more productive plant operations in motor drives and power distribution networks. The 300 A amperage rating supports protection for high-current feeders without nuisance tripping, enabling smoother startup sequences and reduced downtime. With a 200 kAIC interrupt rating at 250 Vac and 100 kAIC at 250 Vdc, the KTN-R-300 provides robust fault clearance for mixed AC and DC applications commonly found in industrial controls and panel boards. The rejection-style construction prevents incorrect insertions, boosting field reliability and minimizing replacement errors during maintenance. Its standard RK1 footprint ensures straightforward compatibility with existing Bussmann/Bussmann-series fuse blocks and spare-part kits. The device’s one-piece design reduces assembly steps and accelerates service times, a meaningful saving in high-volume maintenance environments. Finally, its compact dimensions and nominal weight support efficient panel design and easier logistics for spare parts inventory.
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FAQs
KTN-R-300 is designed for standard RK1 fuse blocks and one-element configurations. Its rejection-style design helps prevent misinstallation, aligning with industry practice in panelboards and motor control centers. When installing, verify the block’s rated current and voltage to match the fuse’s 300 A, 250 Vac/250 Vdc ratings, and ensure secure, strain-relieved connections for reliable operation in harsh environments.
Key specs include a 300 A amperage rating, 200 kAIC interrupt rating at 250 Vac, and 100 kAIC at 250 Vdc. The fuse is rated for 250 Vac and 250 Vdc, with a single-element construction and Class RK1 designation. These ratings enable fast fault clearing while protecting downstream equipment in both AC and DC circuits found in industrial settings.
Yes, the KTN-R-300 supports DC operations up to 250 Vdc with a 100 kAIC interrupt rating, making it suitable for DC bus protection in mixed systems. As with any DC application, confirm the exact DC fault current in your network and ensure the fuse type and mounting are compatible with the DC environment and enclosure design.
The provided data lists Class RK1 and general specifications but does not enumerate CE, UL, or other regional certifications. For compliance, consult Eaton’s official datasheets or contact Eaton technical support to confirm current regional approvals and any required documentation before procurement or deployment.
The KTN-R-300’s high interrupt ratings and fast-acting protection minimize equipment damage and unplanned downtime, contributing to lower repair costs and shorter maintenance windows. Rejection-style construction reduces replacement errors, which translates to fewer service interruptions and a faster return on investment in critical processes and continuous production environments.