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Bussmann KTN-R-6 Class RK1 Current-Limiting Fast-Acting Fuse, 250V 6A
The Bussmann KTN-R-6 fuse, part of the Eaton Bussmann Series KTN-R lineup, is a current-limiting, fast-acting fuse engineered with minimal time delay for dependable overcurrent protection in electrical distribution and control circuits. Rated 250V and 6A, this Class RK1 fuse features ferrule end x ferrule end terminations and a melamine glass tube body measuring 0.56" in diameter, giving installers a compact, code-compliant fuse for panelboards, switchboards, and equipment protection. As a non-indicating fuse, the KTN-R-6 delivers straightforward current-limiting performance without a blown-fuse indicator window. This fuse is designed as a direct fit replacement for RK1-rated applications requiring compact, ferrule-terminated current limitation.
Key Features
- Voltage & Amperage Rating: Rated 250V and 6A for reliable branch-circuit and equipment overcurrent protection.
- Fast-Acting, Current-Limiting Design: Built with minimal time delay for a rapid response to fault currents, reducing let-through energy to protect downstream components.
- Class RK1 Construction: Meets Class RK1 dimensional and performance criteria, allowing use in fuse holders and clips designed for RK1 fuses.
- Ferrule End x Ferrule End Terminals: Standard ferrule-to-ferrule terminations for straightforward installation in compatible fuse blocks and holders.
- Melamine Glass Tube Body: Durable melamine tube construction measuring 0.56" in diameter for consistent mechanical strength and dielectric performance.
- Non-Indicating Design: Provides dependable current-limiting protection without a blown-fuse indicator.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Branch-Circuit Overcurrent Protection
- Industrial and Commercial Electrical Panels
- Motor and Equipment Circuit Protection
- Control Circuit and Transformer Protection
- Panelboard and Switchboard Fuse Holders
Why Bussmann?
Bussmann fuses are engineered for consistent, code-compliant overcurrent protection across commercial and industrial electrical systems. The KTN-R-6's Class RK1 construction, current-limiting performance, and durable melamine tube body reflect the build quality electrical professionals rely on for demanding installations. Choose the Bussmann KTN-R-6 for dependable, fast-acting circuit protection backed by the Eaton Bussmann Series KTN-R platform.
Manufacturer Resources
Product Specs
- list_batch:
- BUSS-20260919
- Product Type:
- Fast-Acting Fuse
- Series:
- KTN-R
- Voltage Rating:
- 250V
- Amperage Rating:
- 6A
- Standards:
- Class RK1
- Connection Type:
- Ferrule End x Ferrule End
- Department:
- Electrical
- Product Subgroup:
- Fuses
- Product Material:
- Melamine
- Product Group:
- Circuit Protection
- Product Length:
- 2 in
- Product Diameter:
- 0.56 in
- Product Height:
- 0.56 in
- Product Weight:
- 0.1 lb
- Product Width:
- 0.56 in
Bussmann KTN-R-6 – Frequently Asked Questions
1) Will a Bussmann KTN-R-6 fit a fuse block made for Class R fuses?
Yes. The KTN-R-6 is built to Class RK1 dimensional and performance criteria, so it drops into fuse holders and clips designed for RK1 fuses. Ends are ferrule to ferrule, which is the standard termination on the smaller amp ratings of this class, and the melamine tube measures 0.56 inch in diameter.
2) Can I use a 250V KTN-R fuse on a 480V circuit?
No. The KTN-R-6 carries a 250V rating, so it is limited to circuits at or below 250 volts. For a 480V or 600V system you need the 600V Class RK1 equivalent, the Bussmann KTS-R series, in the same amp rating.
3) Is a fast-acting Class RK1 fuse the right choice for a motor circuit, or do I need time delay?
The KTN-R-6 is fast-acting with minimal time delay, which is what you want for protecting non-inductive loads, control circuits, and downstream components where you need let-through energy held down. A motor with a high inrush will often nuisance-open a fast-acting fuse sized for running current; for motor branch circuits most installers use the dual-element time-delay Class RK1 fuse instead, the Bussmann FRN-R at 250V, and keep the KTN-R for applications where fast clearing matters more than inrush tolerance.
4) What is the exact part number to order for a 6 amp 250V Bussmann Class RK1 fuse?
Order Bussmann KTN-R-6. That is the manufacturer part number for the 6 amp, 250V member of the Eaton Bussmann KTN-R series, and the amp rating is the trailing number in the designation.
5) Can a Class RK1 fuse be installed in a holder built for Class H or K fuses?
Class R fuses carry a rejection notch on one ferrule, so a KTN-R-6 will seat in a standard Class H or K holder of the same amp range, but the reverse is not true: a non-current-limiting Class H fuse will not fit a Class R rejection clip. That is the point of the design, it keeps a lower-interrupting fuse out of a circuit specified for current limitation. The KTN-R-6 is 250V, 6A.
6) Why does current limiting matter when I am picking a fuse for a switchboard?
A current-limiting fuse like the KTN-R-6 opens fast enough during a fault to cut the let-through energy reaching downstream gear, which is what lets you meet series-rated and withstand requirements on panelboards and switchboards. Class RK1 is the tighter let-through category of the Class R family, so it is the one specified where equipment protection is the driving concern.
7) Does the KTN-R-6 have a blown fuse indicator?
No window or indicator on it. The KTN-R-6 is a non-indicating fuse, so you confirm an open element with a meter or continuity check rather than by looking at the fuse. If your panel standard calls for visual indication, specify an indicating version instead.
8) What is the body of the KTN-R-6 made of?
Melamine glass tube, 0.56 inch in diameter. Melamine holds up mechanically and dielectrically under fault conditions better than a plain fiber tube, which is why it is used on Class R bodies rather than the cheaper materials found on general purpose fuses.
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Does the Bussmann KTN-R-6 come with a warranty?
Absolutely. The Bussmann KTN-R-6 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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