Littelfuse LFRU2621R - 250V CLASS R REDUCER 200 TO 100
Littelfuse

LFRU2621R

Alternate Item Number: LFRU2621R

UPC: 079458380378

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Specification Sheet

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Overview

The Littelfuse LFRU2621R is a critical component for ensuring the integrity of electrical systems by preventing overfusing. This fuse reducer is specifically designed to allow smaller-sized fuses to be installed into existing fuse clips, which were originally intended for larger amperage fuses. By enabling the use of a lower amperage fuse than the clip was designed for, the LFRU2621R ensures that the circuit is protected to the appropriate specifications, safeguarding valuable equipment from potential damage caused by excessive current flow. This is particularly useful in applications where equipment upgrades or changes in operational parameters necessitate a different fuse rating, offering a cost-effective and reliable method for adapting to evolving protection requirements. The LFRU2621R provides a simple yet effective way to enhance the safety and efficiency of electrical systems, avoiding the need to replace entire fuse blocks or holders. It is a vital component for any electrical system requiring adaptable and reliable fuse protection, ensuring precise overcurrent protection and minimizing downtime. The Littelfuse LFRU2621R is compatible with various industrial fuse types and is built to meet stringent industry standards for reliable performance and compliance in diverse industrial settings, including manufacturing, automation, and power distribution systems. Its robust construction ensures long-term durability and consistent protection for sensitive electronic components and equipment. Trust Littelfuse, a recognized leader in circuit protection solutions, to deliver superior performance and safety with the LFRU2621R fuse reducer.
  • Prevents overfusing by allowing smaller fuses in existing clips
  • Safeguards valuable equipment and minimizes downtime
  • Cost-effective and reliable adaptation to changing fuse requirements
  • Enhances safety and efficiency of electrical systems
  • Robust construction for long-term durability and consistent protection
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-2661R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-626R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRUJ13

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-2621

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-663

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-263R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-263

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-616R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Box cover units provide an economical method of protecting small motors against overcurrent damage. For use with Edison-Base plug fuses (TOO, TLO) or Type S plug fuses (SOO, SLO) with adapters (SAO).

LSCY

Box cover units provide an economical method of protecting small motors against overcurrent damage. For use with Edison-Base plug fuses (TOO, TLO) or Type S plug fuses (SOO, SLO) with adapters (SAO).
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-213

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-226R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-213R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.