ALFR-2 WELWYN | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 2
Technical content
- Meets all test and specifications of GR-1089 & UL-1459
- Resistance IR8 to 1K6
- Tolerance down to 1%
- Withstands lightning surges
- Flameproof inorganic construction
- Auto-insertable, small size
- Meets FCC, EIA and UL requirements
- UL-497A approved General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 117 Issue B · 03.02 A subsidiary of TT electronics plc Welwyn Components Dimensions (Inches) L W A B C T E F G H K L1 D1Ø D2Ø L W A KB F C T E 1 2 3 4 G H The four (4) terminal leads shall be in line to a tolerance to ±0.015 inch. The lead spacing dimensions as specified, shall be measured from the tip of the lead to the top 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. Electrical Data Maximum Power rating watts 2 Temperature coefficient ppm/°C 50 Tolerance % 1, 5 Load life (1000 hours) ∆R% 1 Temperature cycling ∆R% 1 Short time overload (5 x RW for 10 sec.) ∆R% 1 Moisture load ∆R% 1 Resistance range ohms IR8 to 1K6 Lightning surge (1000 V-10/1000 µsec) ∆R% 225 negative & 25 positive surges (2 minute intervals) The standard ALFR-2 contains a 128°C thermal fuse. For faster fusing characteristics a 110°C fuse is available. Physical Data
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 118 Issue B · 03.02 Welwyn Components Design and Construction The Line Feed Resistor is a tight tolerance, stable resistor which has the additional capability to withstand both in the rush currents and certain lightning pulse surges but would fuse safely when exposed to overload conditions such as 600 volt power line crosses. Packaging The resistors are supplied in anti-static tubes. 1000 100 0 1 10 100 1000 Power Dissipation (watts) Time to Fuse (sec) ALFR-2 Fusing Curve