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TELECOMMUNICATIONS LINE FEED RESISTORS ISO-9001 Registered ALFR-2 SERIES • Meets all test and specifications of GR-1089 & UL-1459 • 1.8 ohm to 1600 ohm range • 1% tolerance • Withstands lightning surges • Opens safely under power cross • Flameproof inorganic construction • Auto-insertable, small size • Meets FCC, EIA and UL requirements • UL-497A approved SPECIFICATIONS: DESIGN & CONSTRUCTION: The Line Feed Resistor is a tight tolerance, stable resistor which has the additional capability to withstand both in rush currents and certain lightning pulse surges but would fuse safely when exposed to overload conditions such as 600 volt power line crosses. Limits - ALFR-2 Characteristics Wattage Temperature Coefficient Tolerance Load Life (1000 hrs.) Temperature Cycling Short Time Overload (5 x RW for 10 sec.) Moisture Load Resistance Range Lightning Surge (1000 V-10/1000 µsec) 25 negative & 25 positive surges (2 minute intervals) • The standard ALFR-2 contains a 128°C thermal fuse. 2 watts 50 ppm/°C 1% and 5% 1% ∆R maximum 1% ∆R maximum 1% ∆R maximum 1% ∆R maximum 1 to 1600 ohms 2% ∆R maximum For faster fusing characteristics a 110°C fuse is available. DIMENSIONS (Inches): The four (4) terminal leads shall be in the line to a tolerance to ±0.015 inch. The lead spacing dimensions as specified, shall be measures from the tip of the lead to the tip of the lead. The leads may have a 15° draft relative to the protector body. In circuit applications terminal leads 1 and 2 shall be connected together externally and leads 3 and 4 used for connection of the device. For proper performance and reduction of safety hazards the current flow should be from lead 3 to 4. HOW TO ORDER: Sample Part No.: 1.045±0.020 ALFR-2 0.030 Meniscus 1000 1% Type .450±.020 .125±.020 Power .150±.020 Resistance Value 0.025 1 .100±.015 2 Tolerance ±1%, ±5% 3 .700±.015 0.070 Typ. .900±.015 .265±.020 0.138±0.020 0.023Lead Dia. 0.032 Lead Dia. WIREWOUND AND FILM TECHNOLOGIES DIVISION 736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com 1