Bussmann KTN-R-250 Class RK1 C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,859.30
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Bussmann KTN-R-250 Class RK1 Current-Limiting Fuse, 250A, 250V

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Model: KTN-R-250

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,859.30
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Bussmann KTN-R-250 Class RK1 Current-Limiting Fuse, 250A

The Bussmann KTN-R-250 is part of the Eaton Bussmann Series KTN-R line of current-limiting, fast-acting fuses engineered for dependable overcurrent protection in demanding industrial and commercial electrical systems. Rated 250A at 250 Vac and 250 Vdc, this Class RK1 fuse delivers a high interrupt rating of 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc, making it well suited for circuits and equipment with significant available fault current. The current-limiting, fast-acting design responds quickly to overcurrent and short-circuit conditions, helping to reduce peak let-through current and energy passed on to downstream conductors, switchgear, and connected equipment. Durable 70/30 brass end caps provide a secure, corrosion-resistant connection point for consistent, long-term circuit performance in RK1-rated fuse holders, switches, and panelboards.

Key Features

  • Amperage Rating: 250A rating delivers dependable overcurrent protection for demanding branch-circuit and equipment applications.
  • Voltage Rating: Rated 250 Vac and 250 Vdc, allowing use across both alternating current and direct current systems.
  • Current-Limiting, Fast-Acting Design: Responds quickly to fault conditions, limiting peak let-through current and energy to help protect downstream conductors and equipment.
  • High Interrupt Rating: 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc supports reliable performance in systems with high available fault current.
  • Class RK1 Fuse: Dimensionally interchangeable Class RK1 construction simplifies replacement in existing RK1-rated fuse blocks, holders, and disconnect switches.
  • Brass End Caps: 70/30 brass end caps provide a durable, corrosion-resistant terminal connection for consistent conductivity over time.
  • Eaton Bussmann Series KTN-R: Part of the established KTN-R fuse series designed specifically for current-limiting overcurrent protection.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Industrial and Commercial Electrical Distribution Panels
  • Motor and Branch Circuit Overcurrent Protection
  • Short-Circuit and Fault Current Protection
  • Panelboards and Switchboards
  • OEM Equipment Requiring Class RK1 Fuses

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the KTN-R Series current-limiting fuses are engineered to deliver fast-acting, Class RK1 performance backed by high interrupt ratings of 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc. With durable 70/30 brass end caps and a current-limiting, fast-acting design, the Bussmann KTN-R-250 helps protect wiring, switchgear, and equipment from damaging fault currents in demanding electrical systems, offering the dependable overcurrent protection that professionals rely on for critical circuit protection.

Manufacturer Resources

Product Specs

list_batch:
BUSS-20260919
Product Type:
Fast-Acting Fuse
Series:
KTN-R
Grade:
RK1
Voltage Rating:
250V
Amperage Rating:
250A
Product Finish:
70/30 Brass End Caps
Department:
Electrical
Product Subgroup:
Fuses
Product Group:
Circuit Protection
Product Diameter:
2.06 in
Product Material:
Melamine glass tube
Product Length:
8.5 in
Product Width:
2.06 in
Product Weight:
1.94 lb
Product Height:
2.06 in

Bussmann KTN-R-250 – Frequently Asked Questions

1) Will a Bussmann KTN-R-250 fit my existing Class RK1 fuse block or disconnect switch?
Yes. The KTN-R-250 is a Class RK1 fuse with dimensionally interchangeable construction, so it drops into existing RK1-rated fuse blocks, holders, and disconnect switches without modification. The 70/30 brass end caps give the clip or stud connection a corrosion-resistant contact surface.
2) Can the KTN-R-250 be used on a DC circuit, not just AC?
It is rated for both: 250 Vac and 250 Vdc. The interrupting rating differs by system, 200 kAIC on AC at 250 V and 100 kAIC on DC at 250 V, so size your available fault current against the correct figure for the system you are protecting.
3) Is a 250V fuse like the KTN-R-250 safe to use in a 480V panel?
No. The KTN-R-250 carries a 250V rating and must only be applied at 250 volts or less. Installing it in a 480V system is a misapplication; for higher-voltage service you need a 600V class fuse instead.
4) What does fast-acting mean on the KTN-R-250, and is it right for a motor circuit?
Fast-acting means it clears overcurrent and short-circuit conditions quickly rather than riding through a long inrush. That limits peak let-through current and energy reaching downstream conductors, switchgear, and equipment. It is listed for motor and branch circuit overcurrent protection, but because it is fast-acting rather than time-delay, the motor's starting inrush has to be accounted for in sizing. Where a time-delay characteristic is required for motor starting, a dual-element time-delay RK5 or RK1 fuse is the usual alternative.
5) Why pick a Class RK1 fuse over an RK5 for switchgear protection?
RK1 and RK5 share the same case dimensions, so either will fit the same clips, but RK1 fuses are the current-limiting class with the lower let-through energy. If your equipment is series-rated or your short-circuit study calls for a current-limiting device to protect downstream gear, RK1 is what the spec means, and the KTN-R-250 meets it at 200 kAIC on 250 Vac. RK5 is the general-purpose choice where let-through is not the governing concern.
6) What is the exact part number to order for a 250 amp Bussmann RK1 fuse at 250V?
The manufacturer part number is KTN-R-250, from the Eaton Bussmann KTN-R series. The KTN prefix is the 250V family; the matching 600V series uses a different designation, so confirm your panel voltage before ordering.
7) Can I standardize a facility's panelboards and switchboards on the KTN-R-250?
Within its ratings, yes. It is intended for industrial and commercial distribution panels, panelboards, switchboards, and OEM equipment that calls for Class RK1, so one part number covers those positions where the circuit is 250A at 250V or less. Positions needing a different ampere rating take a different KTN-R number, but the body style stays the same across the series.
How fast can I get the Bussmann KTN-R-250 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann KTN-R-250 come with a warranty?
Absolutely. The Bussmann KTN-R-250 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann KTN-R-250?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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