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| Tubular Cement Coated Wirewound Resistors CW Series Welwyn Components * * * * * Forced air cooling to 90 watts All welded construction Flameproof protection Suitable for automotive application Weldable terminations Electrical Data CW10 Power rating at 25C Resistance range Limiting element voltage TCR 20 - 70C Resistance tolerance (Code) Standard values Thermal impedance Ambient temperature range C/watt C 23 -55 to +280 watts ohms volts ppm/C % 10 0.35 to 6K 250 150 5 (J), 10 (K) E24 11 Other values available CW20 20 0.3 to 18K 600 Notes Physical Data Dimensions (mm) Type L 0.75 CW10 34.25 CW20 41.75 D max. 12.00 22.50 T 0.15 5.00 5.00 6.35 0.2 13.00 0.35 14.00 22.00 0.361 5 L d D T E d A max. 9.00 B max. 16.50 E nom. 0.361 F min. 6 F A B Construction Precision stainless steel collars are welded onto a high purity ceramic tube. The wire element is wound onto the ceramic tube using controlled tension for optimum performance. Electrical connections are welded to ensure good electrical stability and high reliability. The resistors are coated with flameproof cement which provides electrical, mechanical and climatic protection. Finally all components are legend marked with indelible ink. Marking All components are legend marked with type reference, resistance value and tolerance. Special custom marking is available by negotiation. Solvent Resistance The marking and protection will withstand all commonly used industrial cleaning fluids suitable for electronic components. Terminations Material The terminations are produced from top quality stainless steel for maximum corrosion resistance. 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. A subsidiary of TT electronics plc Issue C * 04.03 (c) 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 119 Tubular Cement Coated Wirewound Resistors CW Series Welwyn Components Performance Data Maximum Load: 1000 hours at 25C Derating from rated power at 25C Short term overload Climatic Temperature rapid change R% R% R% R% R% 5 5 1 5 Zero at 280C 1 1 0.5 5 x Power rating for 10 seconds Tested to BS 40201-002 Tested to BS 40201-002 Typical 2 Notes Application Notes If air cooling of these components is employed the power handling capability is increased substantially. The graphs below are intended as a guide and testing by the user is recommended. Graph 1 CW 10 Temperature rise ventilated Temperature rise over ambient C 300 250 200 150 100 50 0 0 10 20 30 40 50 Power watts Cu Ft / min No flow 500 1000 Graph 2 CW 20 Temperature rise ventilated Temperature rise over ambient C 300 250 200 150 100 50 0 0 10 20 30 40 50 Power watts 60 70 80 90 100 Cu Ft / min No flow 500 1000 Packaging Components are packed in custom designed trays and boxes for maximum protection during transit and ease of use by the customer. Standard Quantities Per Box Type Box Shipping box CW10 400 4000 CW20 150 1500 (c) 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 120 Issue C * 04.03 |
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