Littelfuse KLNR Series Class R...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$12.80
Littelfuse KLNR Series Class RK1 Current-Limiting Fast-Acting Fuse, 250V

Littelfuse KLNR Series Class RK1 Current-Limiting Fast-Acting Fuse, 250V

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Model: KLNR002

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

$12.80
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Littelfuse KLNR Series Class RK1 Current-Limiting Fast-Acting Fuse, 250V

The Littelfuse KLNR Series is a family of Class RK1 current-limiting, fast-acting fuses rated 250VAC and 125VDC, available in ratings from 2A to 125A to fit a wide range of industrial cartridge fuse holders. Each fuse in the series uses a single-element, silver-link design that delivers a 200,000 A.I.R. interrupting rating (20,000A@125VDC) for reliable protection of non-inductive loads, lighting circuits, and resistance heaters. The extremely current-limiting performance of the KLNR Series stops damaging short-circuit current faster than any mechanical protective device, and every fuse in the series is UL Listed and CSA Certified for use in standard Class RK1 fuse holders and blocks.

Key Features

  • Amp Rating Range: The KLNR Series is available from 2A to 125A to match a broad range of overcurrent protection needs.
  • Voltage Rating: 250VAC and 125VDC rating across the series for dependable overcurrent protection.
  • Current-Limiting Design: Single-element, silver-link construction stops damaging short-circuit current faster than any mechanical protective device.
  • Fast-Acting Opening: Fast-Acting (F) characteristic suited for non-inductive loads, lighting circuits, and resistance heaters.
  • High Interrupting Rating: 200,000 A.I.R. rating minimizes the need for short-circuit calculations, with an interrupting rating of 20,000A@125VDC.
  • UL Class RK1 Cartridge Fuse: Industrial Cartridge package size for use in standard Class RK1 fuse holders and blocks.
  • Series-Rated Protection: Increases interrupting ratings of molded case circuit breaker load centers and panelboards when series-rated with KLNR/KLSR Class RK1 fuses, with series ratings up to 200,000A available.
  • Extended Equipment Life: Current-limiting design reduces equipment damage caused by the heating and magnetic effects of short-circuit currents.

Certifications & Compliance

  • UL Listed (UL JDDZ E81895)
  • CSA Certified (CSA 1422-02 029862)

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Molded Case Circuit Breaker Load Centers & Panelboards (Series-Rated)
  • Non-Inductive Loads
  • Lighting Circuits
  • Resistance Heaters
  • Industrial Electrical Distribution Systems

Why Littelfuse?

Littelfuse KLNR Series fuses combine a proven single-element, silver-link design with a 200,000 A.I.R. interrupting rating for dependable, code-compliant overcurrent protection across the full 2A to 125A range. Backed by UL Listing and CSA Certification, the KLNR Series delivers the current-limiting performance electrical professionals rely on for panelboard, lighting, and resistance-heater circuits. Choose Littelfuse for consistent, code-compliant fuse protection built on proven current-limiting fuse design.

Product Specs

Series:
KLNR
Product Type:
Fast-Acting Fuse
Voltage Rating:
250V
Product Material:
Silver
Listing:
UL Listed
Standards:
CSA Certified
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse KLNR002 – Frequently Asked Questions

1) Will a Littelfuse KLNR fuse fit my existing Class RK1 fuse block?
Yes. The KLNR Series is a UL Class RK1 industrial cartridge fuse, so it drops into standard Class RK1 fuse holders and blocks. Class R fuse blocks use a rejection feature that accepts Class RK1 and RK5 fuses only, which is exactly what this series is built to.
2) Can I use a KLNR fuse on a 480V circuit?
No. KLNR fuses are rated 250VAC and 125VDC. On a 480V system you need a 600V Class RK1 fuse instead; Littelfuse's equivalent 600V series is the KLSR. Never apply a 250V fuse above its voltage rating, even if the amp rating matches.
3) What is the interrupting rating on the Littelfuse KLNR, and do I still need a short-circuit study?
200,000 A.I.R. on AC and 20,000A at 125VDC. That rating is high enough that it covers available fault current in virtually any commercial or industrial service, which is why the series is described as minimizing the need for short-circuit calculations.
4) I need a time-delay Class RK1 fuse instead of a fast-acting one for a motor circuit. What should I use?
The Littelfuse KLNR series is fast-acting, intended for non-inductive loads, lighting circuits, and resistance heaters, so it is not the choice where inrush has to be ridden through. The Mersen A2D-R is a Class RK1 time-delay fuse with SmartSpot indication, which fits the same Class RK1 holder footprint while tolerating the starting current of an inductive load. The indicator also lets you spot an opened fuse without pulling it.
5) What is the closest cross-brand equivalent to a Littelfuse KLNR fast-acting Class RK1 fuse at 250V?
The Mersen Amp-Trap A2K series is a fast-acting Class RK1 fuse rated 250V, which matches the Littelfuse KLNR series on class, opening characteristic, and voltage rating. Both fit standard Class RK1 fuse holders and blocks, so a holder prepped for a KLNR takes an A2K of the same amp rating and physical size. Confirm the amp rating you need is offered in the Mersen line before swapping.
6) What amp ratings does the Littelfuse KLNR fuse come in?
The KLNR family spans 2A to 125A. Orderable ratings include 2A (KLNR002), 3A (KLNR003), 4A (KLNR004), 6A (KLNR006), 8A (KLNR008) and 125A (KLNR125). Pick the rating off your panel schedule or the nameplate of the load you are protecting.
7) Can KLNR fuses raise the interrupting rating of my existing breaker panel?
Yes, through series rating. When a molded case circuit breaker load center or panelboard is series-rated with KLNR/KLSR Class RK1 fuses ahead of it, the combination carries series ratings up to 200,000A. The series combination has to be one the panelboard manufacturer lists on its label.
8) Is the Littelfuse KLNR fuse UL Listed and CSA approved for inspection?
Both. The KLNR Series is UL Listed under UL JDDZ E81895 and CSA Certified under CSA 1422-02 029862. That covers the usual AHJ questions on listed overcurrent protection in distribution equipment.
9) What is the difference between the Littelfuse KLNR and the Mersen A2K Class RK1 fuse?
Both are 250V fast-acting Class RK1 fuses, so they share the same Class R mounting dimensions and rejection fit. The Mersen Amp-Trap A2K Series is the direct cross for the KLNR when you are standardizing on Mersen; the A6K-R series part A2K12R is also a fast-acting Class RK1. Match amp rating and voltage and either will land in the same block.
10) Will a current-limiting fuse protect my downstream gear better than the breaker already in the panel?
For short circuits, yes. The KLNR clears damaging short-circuit current faster than any mechanical protective device, which cuts the heating and magnetic stress that wrecks conductors, contactors and starters during a fault. That let-through reduction is the main reason specs call for Class RK1 current-limiting fuses ahead of sensitive distribution equipment.
11) Can I use a Square D PowerLogic meter fuse pack in place of a KLNR fuse?
No. The Square D PowerLogic fuse pack is a set of three 0.5A 600V fuses intended for energy meter voltage-sensing inputs, not a Class RK1 branch or feeder fuse. The Littelfuse KLNR series is a 250V Class RK1 industrial cartridge fuse for protecting lighting, resistance heater, and panelboard circuits. The two are not interchangeable in either direction.
12) Why does the KLNR use a silver link, and does that matter for maintenance?
The element is a single-element silver link. Silver's low resistance and stable melting behavior keep the fuse's opening characteristic consistent over time, which is why the KLNR holds a tight current-limiting curve rather than drifting as cheaper elements age.
13) Is a Mersen medium voltage E-rated fuse an alternative to a Littelfuse KLNR?
No. The Mersen D0R0 series Amp-Trap is an E-rated medium voltage fuse with ferrule terminals, used on medium voltage transformer and feeder applications. The Littelfuse KLNR series is a low voltage Class RK1 cartridge fuse rated 250VAC and 125VDC for industrial fuse holders and blocks. They serve different system voltages and mount in different hardware.
How fast can I get the Littelfuse KLNR002 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 Littelfuse KLNR002 come with a warranty?
Absolutely. The Littelfuse KLNR002 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 Littelfuse KLNR002?
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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