Resistors 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 Spade terminal option RoHS compliant All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data WH5 WH10 WH25 WH50 Notes Power rating at 25C watts 10 15 25 2 50 1, 2 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 Note 1: For load at full rating mount on aluminium heatsink 30.5cm x 30.5cm x 1.5mm Note 2: WH25T & WH50T are additionally rated at 15A 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 Standard values Thermal impedance Ambient temperature range volts 150 C/watt C 16.0 WH100 Power rating at 25C Resistance range TCR (-55 to 200C) Resistance tolerance Low value limits Isolation voltage Limiting element voltage Standard values Thermal impedance Ambient temperature range watts ohms ppm/C % ohms volts volts C/watt C 250 500 E24 preferred range 10.0 6.0 -55 to 200 WH200 100 0R01 to 70K 1250 3.5 WH300 200 300 0R01 to 50K 0R01 to 68K 1K0: 100 >1K0: 25 Standard 5(J) and 10(K). Also available: 1(F) and 2(G) Typically 0R05: 5% 0R047: 10% 6360 7070 7070 1900 1900 2500 E24 preferred range 1 0.7 0.6 -55 to 200 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. DC or AC rms Other values to order On standard heatsink Notes On standard heatsink DC or AC peak DC or AC rms Other values to order On standard heatsink BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.18 Aluminium Housed Wirewound Resistors WH Series Physical Data Dimensions (mm) & Weight (g) WH5, 10, 25 & 50 A B Type Max 0.3 WH5 30 12.4 WH10 36.5 15.9 WH25 51 1 19.8 WH50 72.5 2 21.4 WH100, 200 & 300 A B Max Max WH100 47.5 88 WH200 72.5 145.7 WH300 72.5 184.4 Note 1: Amax for WH25T is 71.3 C 0.3 11.3 14.3 18.3 39.7 C Max 24.1 41.8 41.8 E Min 1.9 1.9 2.8 2.8 F Max 17 21 28 30 G Max 9 11 15 16 D E F Max Max 0.3 27.3 65.2 35 45.5 89.7 70 45.5 127.7 104 Note 2: Amax for WH50T is 95.5 WH5, 10, 25 & 50 G 0.3 37 57.2 59 H Dia 0.2 2.4 2.4 3.3 3.3 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. N Max 1.8 2.2 2.6 2.6 Dt Min 2.5 2.9 4.3 5.1 Dt Min 7.0 15 15 Wt Nom 3.6 5.6 13 29 Wt. Nom 115 475 700 WH200 & 300 Spade terminal on WH25T & WH50T Nominal dims in mm Cap and lead assemblies are fitted to a high purity ceramic substrate. The resistive element is wound onto the substrate and welded to the caps. The wound rod is then moulded and fitted into aluminium housing to give optimum stability and reliability. M 0.5 4.3 5.2 7.2 7.9 H J K L M Max Max Max Nom 3 Max 11.8 15.4 3.7 4.4 20.5 10.4 5.5 5.1 103.4 20.5 12.4 5.5 6.6 141.4 Note 3: WH100: 0.25, WH200 & 300: 0.45 WH100 Construction L Max 17.0 21.0 29.0 51.0 End face tracking distance = Dt Marking The resistors are legend marked with type reference, resistance value and tolerance which will withstand all accepted industrial cleaning fluids. Values are marked in accordance with IEC 62. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.18 Aluminium Housed Wirewound Resistors WH Series Terminations WH5-100 Material Strength WH25T & 50T Pb-free solder dipped, copper clad steel The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1, clause 4.17.3.2 Solderability WH200 & 300 Material Strength Performance Data 6.35mm (1/4") spade terminal M6 threaded steel terminal with a set of four nuts and washers Termination robustness 50N max Tightening torque 5Nm max WH5, 10, 25 & 50 Actual Maximum Typical Load at commercial rating: 1000hrs at 25C R% 1 1 0.4 Load at CECC rating: 1000hrs at 25C R% 1 1 0.4 Dry heat: 1000hrs at 200C R% 1 1 0.4 Derating from 25C Zero at 200C, see derating graph Short-term overload R% 1 1 0.2 Climatic sequence R% 1 1 0.4 Climatic category 55/200/56 Long-term damp heat R% 1 0.5 0.2 Temperature rapid change R% 0.25 0.25 0.1 Resistance to solder heat R% 0.25 0.25 0.05 Vibration and bump R% 0.25 0.25 0.025 Noise (in decade of frequency) V/V Not specified 0 0 Insulation resistance ohms 1G min 10G min Pulse and overload performance Not specified See graphs Note: A 0.05 ohm addition is to be added to the performance of all resistors < 10 ohms. WH100, 200 & 300 CECC 40203-006 Requirements 0.25 WH100: 0.5 0 WH25-300 WH5&10 1000 Energy (joules) For short durations of 0.1s the energy graph should be used. For longer durations the overload graph applies. Multiple of Rated Power 2 N/A 2 10000 Pulse and Overload Performance 10 Maximum 100 WH300 WH200 WH100 10 WH50 WH25 1 WH5-50 1 0.1 1 10 Overload Duration (s) WH10 WH100-300 100 1000 WH5 0.1 0.01 0.1 1 10 100 1000 10000 100000 Value (ohms) Application Notes After soldering, care should be taken to ensure that there are no flux residues on the end faces of the moulding compound, otherwise insulation resistance will be reduced. The minimum surface tracking distances from termination to casing are shown in the Physical Data tables as dimension Dt. It is recommended that the resistor base should be coated thinly with heatsink compound before mounting to obtain the stated operating characteristics. The heatsink compound increases thermal conductivity to the heatsink. General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.18 Aluminium Housed Wirewound Resistors WH Series The standard aluminium heatsinks are defined in the table below. If smaller heatsinks are used then derating should be applied as indicated in the graph below. If no heatsink is employed, use the ratings for 1cm2. Type (CECC) WH5 (AA) WH10 (BA) WH25 (CA) WH50 (DA) WH50 @ 50W WH100 WH200 WH300 Thickness (mm) 1 1 1 1 1.5 3 3 3 Derating for reduced heatsink dimensions Area (cm) 410 410 544 544 930 1000 3800 5800 Derating for ambient temperature Proportion of Pr (%) 1 20 1 00 1000 WH300 25C WH300 70C WH200 25C WH200 70C Ma xim um Dis sipa tion (W) Reference heatsink dimensions 100 WH100 25C WH100 70C WH50 25C DA 25C DA 70C WH25/CA 25C WH25/CA 70C WH10/BA 25C WH10/BA 70C WH5/AA 25C 10 WH5/AA 70C 80 60 40 20 1 0 0 10 0 1 20 0 10 100 1000 10000 Heatsink Surface Area (cm 2) A m b ie n t T e m p e ra tu r e (C ) Packaging WH resistors are packed in plastic bags and boxed. Ordering Procedure Example: WH25 with spade terminals at 100 ohms with a 5% tolerance: WH25T-100RJI Type Termination Standard Spade terminal T Value (use IEC62 code) Tolerance (use IEC62 code) F G 1% 2% J K 5% 10% Packing WH5, 10 I WH25, 50 WH100 WH200, 300 250/box Bulk 200/box 45/box 10/box Standard The following options apply toWH5, 10, 25 & 50 only: For CECC released product state on order the CECC number and style. Example: WH25-3K3JI CECC40203-006 CA For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: WH25-3K3JPB General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.18