Eaton KTN-R-3 Fuse - Class RK1, 3 A, 250 V, 200 kA
Part Number: KTN-R-3
Quick Summary
KTN-R-3 fuse by Eaton provides fast-acting overcurrent protection for branch circuits in industrial control panels. Engineers frequently encounter nuisance trips and downtime when protection devices respond too slowly or miscoordinate during startup. Certification notes aren’t listed here, but the device is a Class RK1 fast-acting, current-limiting fuse rated for 200 kA at 250 Vac. Its ferrule-end connections and compact 2 in length simplify panel layout and reduce installation time, while delivering reliable protection in automation systems. This makes it suitable for OEMs, panel builders, and maintenance teams seeking predictable performance and lower total cost of ownership.
Product Information
Extended Description
KTN-R-3 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 3 A, rejection style fuse, interrupting rating of 200 kA at 250 Vac
Product Name
Eaton Bussmann series KTN-R fuse
Catalog Number
KTN-R-3
UPC
051712407014
Product Length/Depth
2 in
Product Height
0.56 in
Product Width
0.56 in
Product Weight
0.1 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
3 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
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: Fast-acting, current-limiting protection. Business impact: Reduces fault energy and minimizes collateral damage to motors, drives, and controllers, improving system reliability. Application: Ideal for branch circuits in industrial control panels where quick fault clearance is essential. Feature: High interrupting rating of 200 kA at 250 Vac. Business impact: Allows the fuse to safely interrupt large fault currents without sustaining damage, enhancing system robustness. Application: Critical loads and heavy-duty automation where fault currents can spike. Feature: Rejection-style, ferrule-end x ferrule-end connection. Business impact: Prevents incorrect installation, decreasing commissioning time and mis-wiring risk. Application: Fits standard Bussmann RK1 fuse blocks and panel assemblies. Feature: Compact 2 in length with 0.56 in diameter and 0.56 in width. Business impact: Enables dense panel layouts and easier retrofits. Application: Space-constrained control cabinets and machinery enclosures. Feature: 70/30 brass end caps and melamine glass tube construction. Business impact: Improves contact reliability and mechanical resilience in demanding environments. Application: Long-term protection in industrial environments with frequent switching. Feature: Non-indicating fuse indicator. Business impact: Keeps panel design simple while requiring external status monitoring. Application: Systems with centralized diagnostics or external indicators. Feature: 3 A amperage rating, 250 V voltage rating. Business impact: Clear matching to controlled loads and safe operation within standard automation voltages. Application: Control circuits, sensors, and drives in automation equipment.
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FAQs
The KTN-R-3 is a Class RK1, fast-acting current-limiting fuse with ferrule-end connections (ferrule x ferrule). It fits standard Bussmann RK1 fuse blocks and panel-fuse holders. Its rejection-style design helps prevent incorrect insertion. For installation, match ferrule sizes to the block, and ensure space in the 2 in long, compact 0.56 in diameter package for straightforward retrofits.
This fuse is rated for 3 A and 250 V, with a high interrupting rating of 200 kA at 250 Vac. It uses a single melamine glass tube with a 70/30 brass end cap for robust contact. The non-indicating design means status monitoring is typically external to the fuse holder, allowing simple integration into existing panel schemes.
KTN-R-3 is non-indicating, so it does not visually show when a fault has cleared. For maintenance, plan external fault indicators or integrate fuse status monitoring in the control system. The fuse’s compact 2 in length and ferrule-end construction support quick replacements with compatible RK1 blocks, minimizing downtime during service events.
Ideal for branch circuits in industrial control panels, machine tool controls, and automation equipment requiring reliable fast-acting protection. The 3 A, 250 V rating with a 200 kA interrupting capability protects motors, controllers, and sensors while helping maintain uptime. The brass end caps and ferrule connections support durable, field-friendly replacements in dense panel layouts.
Technical information is available via Eaton Bussmann catalogs and datasheets. Refer to the Bussmann Full Line Catalog and the KTN-R data sheet no. 1043 for 250 V Class RK1 details (bus-ele-cat-1007-flc-2018.pdf and bus-ele-cat-1007-flc-2018-sec-01-lv-branch.pdf). For compliance research, use the RoHS tool and Fuseology resources to verify standards alignment.