Fuse Datasheet 461 Series TeleLink Fuse Surge Resistant RoHS Description 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-1089Core, TIA- 968-A, UL/EN/IEC 60950, and ITU K.20 and K.21. The coordination requirement contained in GR-1089Core, and ITU K.20/21 may require a series of impedance devices. Features & Benefits Surface mount surge resistant 2A rating has improved Slo-Blo fuse temperature rise performance under 2.2A surge current Additional Information Meet UL 60950 3rd Edition testing when compared with power cross requirements 1.25A rating standard alone Product is Halogen Free Designed to allo w compliance and RoHS compliant and with Telcordia GR-1089-CORE compatible with lead-free and TIA-968-A (formerly FCC solder and higher temperature Part 68) Surge Specifications profiles when ordered with Resources Accessories Samples Provide coordinated protection Standard Silver Plated Brass with Littelfuse SIDACtor Caps Transient Voltage Suppressor UL Recognized to UL/CSA/ (TVS)or a GreentubeTM Gas Agency Approvals NMX 248-1 and UL/CSA/NMX Plasma Arrestor, without series 248-14 resistors Agency Agency File Number Ampere Range Conforms to IEC/EN 60127-1 Designed to ser ve the E10480 0.5A - 2A and IEC/EN 60127-7 requirements of a wide range of telecommunication and 29862 0.5A - 2A networking equipment J50502555 0.5A - 2A Applications Electrical Characteristics for Series T1/E1/J1 and HDSL2/4 Ethernet 10/10 0/10 0 0BaseT POTS applications such SLIC interface portion of Fiber % of Ampere Rating Opening Time to the Curb (FTTC) and Fiber as modems, answering machines, telephones, fax to the Premises (FTTP) 100% 4 hours, Minimum machines, and security Non-Fiber SLIC interface for 250% 1 sec., Minimum 120 secs., Maximum systems Central Office (CO) locations ISDN U interface and Remote Terminals (RT) Baystation T1/E1/J1, T3 (DS3) xDSL applications suc h as Maximum Temperature Rise trunk cards ADSL, ADSL2+, VDSL, and VDSL2+ 2 Telecom Nano Fuse Temperature Reading 04611.25 < 82C (180F) 0461002. < 50C (122F) Higher Currents and PCB layout designs can affect this parameter. Readings are measured at rated current after temperature stabilizes. 2021 Littelfuse, Inc. 1 Specifications are subject to change without notice. Revised: GD. 05/31/21Fuse Datasheet 461 Series TeleLink Fuse Surge Resistant Electrical Specifications by Item Agency Approvals Ampere Max Voltage Interrupting Nominal Cold Nominal Melting Amp Code 2 2 2 Rating (A) Rating (V) Rating Resistance (Ohms) I t (A sec) 1 0.500 .500 600 0.560 0.840 x x x 50A 250 VAC 1 1.25 1.25 600 60 A 600 VAC .1040 16.5 x x x 1 100 A 80 VDC 2.00 002. 600 .0450 17.5 x x x 1 2 2 2 2 2 I t is calculated at 10 msecs. or less. I t at 10 times rated current has a typical value of: 24 A sec (2.0A), 22 A sec (1.25A), 1.3 A sec (0.5A). Typical inductance <40nH up to 500 MHz. Resistance changes 0.5% for every C. Resistance is measured at 10% rated current. 2 Interrupting Rating may differ based on Agency Approval. See Agency Approval certificate for more details. Average Time Current Curves Temperature Re-rating Curve 100 10 1 0.1 Note: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 25% for continuous operation. 0.01 0.001 0.1 1 10 100 1000 CURRENT IN AMPERES GR 1089 Inter-building requirements GR 1089 1st level lighting surge inter-building (Equipment under test can not be damaged and must continue to operate properly) Minimum Peak Minimum Peak Max. Rise/Min. Repetitions Fuse Surge Voltage (V) Current (A) Decay (s) Each Polarity Choices 1 600 100 10/1000 25 1.25, 2.0 2 1000 100 10/360 25 1.25, 2.0 3 1000 100 10/1000 25 1.25, 2.0 4 2500 500 2/10 10 1.25, 2.0 5 1000 25 10/360 5 0.5, 1.25, 2.0 If sufficient series resistance is used, then the 0.5 fuse may be used in test conditions 1-4. GR 1089 2nd level lightning surge telecom port (Equipment under test shall not become a fire or electrical safety hazard) Minimum Peak Minimum Peak Max. Rise/Min. Repe-titions Fuse Surge Voltage (V) Current (A) Decay (s) Each Polarity Choices 1 5000 500 2/10 1 0.5, 1.25, 2.0 Alter-native 5000 500/8=625 8/10 1 0.5, 1.25, 2.0 The 0.5 fuse will open during these test conditions. The 1.25 & 2.0 will not open thus providing operational compliance. 2021 Littelfuse, Inc. 2 Specifications are subject to change without notice. Revised: GD. 05/31/21 TIME IN SECONDS .500A 1.25A 2A