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

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.