461 Series - TELELINK® Surge Tolerant Surface Mount Fuse

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.

The Littelfuse 461 Series TeleLink® Surface Mount, Surge Resistant Fuse, offers over-current protection for a wide range of telecom applications without requiring a series resistor. When used in conjunction with a Littelfuse SIDACtor® Transient Voltage Suppressor (TVS) or a GreentubeTM Gas Plasma Arrestor, this combination provides a compliant solution for standards and recommendations such as GR-1089–Core, TIA-968-A, UL/ EN/IEC 60950, and ITU K.20 and K.21. The coordination requirement contained in GR-1089–Core, and ITU K.20/21 may require a series of impedance devices.


  • Surface mount surge resistant Slo-Blo® fuse
  • Meet UL 60950 3rd Edition power cross requirements standard alone
  • Designed to allow compliance with Telcordia GR-1089-CORE and TIA- 968-A (formerly FCC Part 68) Surge Specifications
  • Provide coordinated protection with Littelfuse SIDACtor® Transient Voltage Suppressor (TVS)or a GreentubeTM Gas Plasma Arrestor, without series resistors
  • Designed to serve the requirements of a wide range of telecommunication and networking equipment
  • 2A rating has improved temperature rise performance under 2.2A surge current testing when compared with 1.25A rating
  • Product is Halogen Free and RoHS compliant and compatible with leadfree solder and higher temperature profiles when ordered with Standard Silver Plated Brass Caps
  • Standard product is RoHS Compliant and compatible with lead-free solders and higher temperature profiles


  • T1/E1/J1 and HDSL2/4
  • SLIC interface portion of Fiber to the Curb (FTTC) and Fiber to the Premises (FTTP)
  • Non-Fiber SLIC interface for Central Office (CO) locations and Remote Terminals (RT)
  • xDSL applications such as ADSL, ADSL2+, VDSL, and VDSL2+
  • Ethernet 10/100/1000BaseT
  • POTS applications such as modems, answering machines, telephones, fax machines, and security systems
  • ISDN “U” interface
  • Baystation T1/E1/J1, T3 (DS3) trunk cards

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VDC (V)VAC (V)Nominal Melting I2T (A2sec)Resistance
Interrupting RatingBodyMin Operating Temp °CMax Operating Temp (°C)Marking CodeStockSamplesCompare
0461.5000.51006000.840.5660A@600VACCeramic-55125LF 500mA TCheckOrder
0461002210060017.50.04560A@600VACCeramic-55125LF 2A TCheckOrder
04611.251.2510060016.50.10460A@600VACCeramic-55125LF 1.25A TCheckOrder
Catalog # Certificates
Sorting icon
0461.500 URcsa
0461002 URcsa
04611.25 URcsa

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PhilsISO14001Certificateicon Phils ISO 14001 2004