Aluminium Housed Wirewound Resistors WH Series High power dissipation up to 300W All welded construction Suitable for severe environments Designed for excellent thermal conductivity to heatsink RoHS compliant Electrical Data WH5 WH10 WH25 WH50 Notes Power rating at 25C watts 10 15 25 50 * On standard heatsink Resistance range ohms 0R01 to 10K 0R01 to 20K 0R01 to 44K 0R015 to 120K TCR (-55 to 200C) ppm/C <10R: 75 10R to <100R: 50 100R: 25 Resistance tolerance % 1(F), 2(G), 5(J) and 10(K) Low value limits ohms 1R at 1% 0R5 at 2% 0R05 at 5% 0R01 at 10% WH50 0R015 at 10% Isolation voltage volts 1500 1500 3000 3000 DC or AC peak * For load at maximum rating mount on aluminium heatsink 30.5 cm x 30.5 cm x 1.5 mm CECC 40203-006 Requirements * AA BA CA DA Notes Power rating at 25C watts 10 15 25 40 On standard heatsink Resistance range ohms 0R05 to 3K4 0R05 to 15K 0R05 to 33K 0R05 to 82K TCR (-55 to 200C) ppm/C 5R to 10R: 100 >10R: 50 Resistance tolerance % 1(F), 2(G), and 5(J) Low value limits ohms 1R at 1% 0R5 at 2% 0R05 at 5% Isolation voltage volts 1000 1000 2000 2000 DC or AC peak * This table indicates the CECC specification requirements which are met or exceeded by the corresponding WH series products. Limiting element voltage volts 150 250 500 1250 DC or AC rms Standard values E24 preferred range Other values to order Thermal impedance C/watt 16.0 10.0 6.0 3.5 On standard heatsink Ambient temperature range C -55 to 200 WH100 WH200 WH300 Notes Power rating at 25C watts 100 200 300 On standard heatsink Resistance range ohms 0R01 to 70K 0R01 to 50K 0R01 to 68K TCR (-55 to 200C) ppm/C 1K0: 100 >1K0: 25 Resistance tolerance % Standard 5(J) and 10(K). also available : 1(F) and 2(G) Low value limits ohms Typically 0R05: 5% 0R047: 10% Isolation voltage volts 6360 7070 7070 DC or AC peak Limiting element voltage volts 1900 1900 2500 DC or AC rms Standard values E24 preferred range Other values to order Thermal impedance C/watt 1 0.7 0.6 On standard heatsink Ambient temperature range C -55 to 200 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own test data and is considered accurate at time of print. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Aluminium Housed Wirewound Resistors Physical Data Dimensions (mm) & Weight (g) WH5 - 50 A B C E F G H L M N Dt Wt. Type Max 0.3 0.3 Min Max Max Dia 0.2 Max 0.5 Max Min Nom WH5 30 12.4 11.3 1.9 17 9 2.4 17.0 4.3 1.8 2.5 3.6 WH10 36.5 15.9 14.3 1.9 21 11 2.4 21.0 5.2 2.2 2.9 5.6 WH25 51 19.8 18.3 2.8 28 15 3.3 29.0 7.2 2.6 4.3 13 WH50 72.5 21.4 39.7 2.8 30 16 3.3 51.0 7.9 2.6 5.1 29 WH100 300 A B C D E F G H J K L M Dt Wt. Max Max Max Max Max 0.3 0.3 Max Max Max Nom* Max Min Nom 47.5 88 24.1 27.3 65.2 35 37 11.8 15.4 3.7 4.4 - 7.0 115 WH100 72.5 145.7 41.8 45.5 89.7 70 57.2 20.5 10.4 5.5 5.1 103.4 15 475 WH200 72.5 184.4 41.8 45.5 127.7 104 59 20.5 12.4 5.5 6.6 141.4 15 700 WH300 * WH100: 0.25, WH200 & WH300: 0.45 WH100 WH200 & 300 WH5 - 50 End face tracking distance = Dt Construction Marking Cap and lead assemblies are fitted to a high purity The resistors are legend marked with type reference, ceramic substrate. The resistive element is wound onto resistance value and tolerance which will withstand all the substrate and welded to the caps. The wound rod is accepted industrial cleaning fluids. Values are marked then moulded and fitted into aluminium housing to give in accordance with IEC 62 optimum stability and reliability. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own test data and is considered accurate at time of print. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com