FLNR020.T
FUSE, 20A, 250V, TIME DELAY
- Manufacturer: LITTELFUSE
- Product type: Industrial & Electrical Power Fuses
- Product Range:POWR-GARD FLNR Series; Fuse Current:20A; Voltage Rating VAC:250VAC; Voltage Rating VDC:125VDC; Fuse Size Metric:14.3mm x 50.8mm; Fuse Size Imperial:9/16" x 2";
- SVHC: To Be Advised
- Fuse Current: 20A
- Product Range: POWR-GARD FLNR Series
- Fuse Size Metric: 14.3mm x 50.8mm
- Fuse Size Imperial: 9/16" x 2"
- Voltage Rating VAC: 250V
- Voltage Rating VDC: 125V
- Blow Characteristic: Time Delay
| Delivery and price | |
|---|---|
| Units per pack | 500 |
| Price | 4.93 € |
| Current stock | 10+ |
| Lead time | 30 days |
**General Purpose Fuses** ## **FLNR/FLSR Class RK5 Fuses** ## **250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes** ## _**Applications**_ Service entrance switches Switchboard main and feeder switches Motor control center mains and motor branch circuits Individual fused combination motor controllers Distribution panelboards Industrial control panels Protection of fully rated panelboards and loadcenters All general purpose circuits ## _**Safety**_ - 200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes. - Faster acting short-circuit protection than any non-current-limiting mechanical protective device. ## _**Reliability**_ - Accurate and reliable — Automated, precision manufactured and assembled parts ensure accurate, consistent response to overloads and short-circuits. ## _**Longer Equipment Life**_ - Reduced damage to equipment caused by heating and magnetic forces of short-circuits. Littelfuse FLNR/FLSR series fuses have been the superior UL Class RK5 dual-element time-delay fuses, and are the most widely used class of fuses. FLNR/FLSR series fuses provide excellent protection for all types of circuits especially those containing motors. However, users and specifiers should consider the significant benefits offered by Indicator fuses. Complete information on these fuses may be found earlier in this section. - Equipment runs cooler with low-resistance dual-element fuses. ## _**Specifications**_ ## _**Ampere Ratings**_ **Voltage Ratings:** AC: 250 Volts (FLNR) 600 Volts (FLSR) DC: 125 Volts (FLNR) 300 Volts (FLSR) **Interrupting Ratings:** AC: 200,000 amperes rms symmetrical DC: 20,000 amperes **Ampere Range:** 1⁄10 – 600 amperes **Approvals:** Standard 248-12, Class RK5 UL Listed (File No: E81895) CSA Certified (File No: LR29862) MSHA 300 Volt Listing (FLSR) QPL: Federal Specification WF-1814 ## _**Dimensions**_ |1⁄10|6⁄10|18⁄10|4|8||30|80|225| |---|---|---|---|---|---|---|---|---| |1⁄8|8⁄10|2|41⁄2|9||35|90|250| |15⁄100|1|21⁄4|5|10||40|100|300| |2⁄10|11⁄8|21⁄2|56⁄10|12||45|110|350| |1⁄4|11⁄4|28⁄10|6|15||50|125|400| |3⁄10**|14⁄10|3|61⁄4|171⁄2||60|150|450| |4⁄10|11⁄2|32⁄10|7|20||70|175|500| |1⁄2|16⁄10|31⁄2|71⁄2|25||75|200|600| |**FLNR only,||||||||| |Example part number (series & amperage): FLSR100||||||||| ## _**Recommended Fuse Blocks**_ LR250 series (for FLNR series fuses) LR600 series (for FLSR series fuses) Refer to FLNR_ID series for FLNR dimensions and FLSR_ID series for FLSR Refer to Blocks & Holders section of this catalog for additional information. dimensions. w w w . l i t t e l f u s e . c o m © 2005 Littelfuse[•] POWR-GARD[™] Products Catalog **33**
Updated at April 17, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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