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WP7S Datasheet(PDF) 2 Page - Welwyn Components Limited |
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WP7S Datasheet(HTML) 2 Page - Welwyn Components Limited |
2 / 4 page Compact Flameproof Power Wirewound Resistors WP-S Series Welwyn Components Performance Data Maximum Typical Change Load at rated power: 1000hrs @ 25°C ∆R% 5 +0.001 Ω 3 Dry heat: 1000hrs @ 200°C ∆R% 5 +0.001 Ω 3 Short term overload (5 x Pr for 5s) ∆R% 5 +0.001 Ω 1 Derating from rated power @25°C Zero at 280°C Climatic ∆R% 5 +0.001 Ω 2 Climatic category 55/200/56 TRC & Vibration ∆R% 5 +0.001 Ω 1 Robustness & solder heat ∆R% 5 +0.001 Ω 1 Long term damp heat (56 days) ∆R% 5 +0.001 Ω 1 Material: Hot tin dipped copper wire Strength: The terminations meet the requirements of IEC 68.2.21 Solderability: The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2 Terminations WP1S, WP2S, WP25S and WP3S resistors R10 and above are marked with four or five colour bands in conformance with IEC62. Values below R10 are marked with three bands (two digits indicating value in milliohms, and tolerance); there is no multiplier band. WP4S, WP5S and WP7S resistors are legend marked with type reference, resistance value and tolerance. Marking The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Solvent Resistance The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. Flammability The pulse energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at 25ºC. Pulse Performance © 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 Issue E · 07.06 100 WP-S Short Pulse Energy Capacity Value (ohms) 10 1 0.1 0.1 1 10 100 1000 10000 WP7S WP5S WP4S WP3S WP2S WP1S WP25S |
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