Telecom Fuses The FT600 fuse series is designed to assist telecommunications equipment manufacturers in complying with North American overcurrent protection requirements, including Telcordia GR- 1089, TIA-968-A (formerly FCC Part 68), and UL60950 3rd edition. The low profile and small footprint of the FT600 fuse provide a reliable, non-resettable overcurrent protection solution. The device offers low temperature-rise performance under sneak current fault events to prevent damage to circuit traces or multilayer boards. When used in conjunction with SiBar thyristor devices, it provides designers with a complete overcurrent/overvoltage protection solution to help them comply with regulatory standards. This fuse offering complements the telecom resettable PolySwitch device series for use in applications where intervention is desired after an overcurrent fault. Benefits Features High density placement in multi-port system designs Low profile and small footprint Improved temperature rise performance over other The lightning robust surface-mount fuse offers similar SMT fuse devices under sneak-current testing overcurrent protection in case of power fault events The FT600 in conjunction with a SiBar overvoltage Enables the design of equipment complying with protection device, assists designers in meeting applicable telecom specifications including UL60950, regulatory standards with no additional series TIA-968-A (formerly FCC Part 68), and Telcordia components GR-1089 Low resistance 12 Applications ADSL, ADSL2, ADSL2plus, SHDSL, VDSL linecards and modems T1/E1 systems Twisted-pair telecom ports requiring Telcordia GR-1089, UL60950 and FCC Part TIA-968-A (formerly FCC Part 68) compliance 85Telecom Fuses Protection Application Guide for Telecommunications and Networking Devices To use this guide, follow the steps below: 1. Select your equipment type from the guide below. 2. Use the Key Device Selection Criteria (time-to-open, surface temperature) to determine best suitability for your application. 3. Use Agency Specification / Selection Guide on the next page to select a specific part number for each application based on the agency requirements. Key Device Selection Citeria Faster Cooler Surface SiBar Thyristor Application Specification Time-To-Open Temperature Surge Protectors* Customer premises equipment, IT equipment UL 60950 FT600-0500 FT600-2000 TVBxxxSC-L Analog modems, V.90 modems, TIA-968-A FT600-1250 ISDN modems, xDSL modems, ADSL splitters, phone sets, fax machines, answering machines, caller ID, internet appliances, PBX systems, POS terminals, wall plugs Access network equipment Telcordia GR-1089 FT600-1250 FT600-2000 TVBxxxSC-L Remote terminals, line repeaters, multiplexers, TIA-968-A cross-connects, WAN equipment Central office switching equipment Telcordia GR-1089 FT600-1250 FT600-2000 TVBxxxSC-L Analog/POTS linecards, ISDN linecards, xDSL modems, TIA-968-A ADSL/VDSL splitters, T1/E1 linecards, multiplexers, CSU/DSU, servers Notes: This list is not exhaustive. Raychem Circuit Protection welcomes our customers input for additional application ideas for overcurrent protection of telecom applications. * For more information on Raychem Circuit Protection SiBar thyristor surge protectors. Agency Specification/Selection Guide for FT600 Devices Use the guide below to select FT600 devices appropriate for use in your application. The following pages contain specifications for part numbers recommended below. FT600 devices enable telecommunication equipment to meet the applicable protection requirements of these industry specifications. Refer to individual agency specifications for test procedures and circuit schematics. Users should independently evaluate the suitability of, and test each product for their application. Family Product Lightning Power Cross FT600 FT600-0500 TIA-968-A (formerly FCC Part 68) - Type A & B UL60950, 3rd Ed. 600VAC, 40A FT600-1250 Telcordia GR-1089 Level 1 and 2 Telcordia GR-1089 600 VAC, 40A FT600-2000 TIA-968-A UL60950 Note: FT600-1250 and FT600-2000 are designed to assist equipment in complying with Telcordia GR-1089 specifications. In-circuit testing is strongly recommended. The FT600-0500, FT600-1250 and FT600-2000 are designed to meet the UL60950 Power Cross and FCC TIA-968-A 68 lightning surge requirements. Note that Type A tests allow for an overcurrent protection component to fuse open during the surge. Interrupt Voltage and Current Ratings for FT600 Devices 2 Part Ampere Rating Voltage Rating Typical Resistance Typical I t 2 ()()()( ) Number A V A S * FT600-0500 0.50 250 0.5 1 FT600-1250 1.25 250 0.1 16 FT600-2000 2.00 250 0.05 18 The FT600-xxxx devices are designed to carry 100% of rated current for 4 hours minimum and 250% of rated current for 1 second minimum, 120 seconds maximum. Resistance measured at 10% of rated current. 2 *I t is calculated at 10 ms or less. 12 Figure FT1 - Thermal Derating Curve (Normalized) for FT600 Devices 130 120 110 100 90 80 70 -70 -50 -30 -10 10 30 50 70 90 110 130 Ambient Temperature C 86 % of Current Rating