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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
Power rating at 25C Resistance range TCR (-55 to 200C) Resistance tolerance Low value limits Isolation voltage watts ohms ppm/C % ohms volts 1R at 1% 1500 AA 10 0R05 to 3K4 WH5 10 0R01 to 10K WH10 15 0R01 to 20K WH25 25 0R01 to 44K WH50 50 * 0R015 to 120K 100R: 25 0R01 at 10% 3000 DA 40 0R05 to 82K WH50 0R015 at 10% DC or AC peak Notes On standard heatsink Notes On standard heatsink
<10R: 75
10R to <100R: 50 0R05 at 5% 3000 CA 25 0R05 to 33K
1(F), 2(G), 5(J) and 10(K) 0R5 at 2% 1500 BA 15 0R05 to 15K
* For load at maximum rating mount on aluminium heatsink 30.5 cm x 30.5 cm x 1.5 mm
CECC 40203-006 Requirements * watts Power rating at 25C Resistance range ohms TCR (-55 to 200C) Resistance tolerance Low value limits Isolation voltage Limiting element voltage Standard values Thermal impedance Ambient temperature range ppm/C % ohms volts volts C/watt C
5R to 10R: 100
>10R: 50
1000 150 16.0
1(F), 2(G), and 5(J) 1R at 1% 0R5 at 2% 0R05 at 5% 1000 2000 250 500 E24 preferred range 10.0 6.0 -55 to 200
2000 1250 3.5
DC or AC peak DC or AC rms Other values to order On standard heatsink
* This table indicates the CECC specification requirements which are met or exceeded by the corresponding WH series products.
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
WH100 100 0R01 to 70K
WH200 200 0R01 to 50K 1K0: 100 >1K0: 25
WH300 300 0R01 to 68K
Notes On standard heatsink
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 DC or AC peak DC or AC rms Other values to order On standard heatsink
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 test data and is considered accurate at time of print.
(c)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 Type WH5 WH10 WH25 WH50 WH100 - 300 A Max 47.5 72.5 72.5 B Max 88 145.7 184.4 C Max 24.1 41.8 41.8 D Max 27.3 45.5 45.5 E Max 65.2 89.7 127.7 F 0.3 35 70 104 G 0.3 37 57.2 59 H Max 11.8 20.5 20.5 J Max 15.4 10.4 12.4 K Max 3.7 5.5 5.5 L Nom* 4.4 5.1 6.6 M Max 103.4 141.4 Dt Min 7.0 15 15 Wt. Nom 115 475 700 A Max 30 36.5 51 72.5 B 0.3 12.4 15.9 19.8 21.4 C 0.3 11.3 14.3 18.3 39.7 E Min 1.9 1.9 2.8 2.8 F Max 17 21 28 30 G Max 9 11 15 16 H Dia 0.2 2.4 2.4 3.3 3.3 L Max 17.0 21.0 29.0 51.0 M 0.5 4.3 5.2 7.2 7.9 N Max 1.8 2.2 2.6 2.6 Dt Min 2.5 2.9 4.3 5.1 Wt. Nom 3.6 5.6 13 29
WH100 WH200 WH300
* WH100: 0.25, WH200 & WH300: 0.45
WH5 - 50
WH100
WH200 & 300
End face tracking distance = Dt
Construction
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.
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
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 test data and is considered accurate at time of print.
(c)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
Terminations
WH5-100 Material Strength Solderability 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 WH200 & 300 Material M6 threaded steel terminal Strength Termination robustness 50N Solderability Non-solderable
Performance Data
WH5 - 50 R% R% R% R% R% R% R% R% R% V/V ohms CECC 40203-006 Requirements 1 1 1 1 1 1 0.25 0.25 0.25 Not specified 1G min Not specified
10000
WH100 - 300 Actual Maximum 2 N/A 2
Load at commercial rating: 1000hrs at 25C Load at CECC rating: 1000hrs at 25C Dry heat: 1000hrs at 200C Derating from 25C Short-term overload Climatic sequence Climatic category Long-term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in decade of frequency) Insulation resistance Pulse and overload performance
Maximum Typical 1 0.4 1 0.4 1 0.4 Zero at 200C, see derating graph 1 0.2 1 0.4 55/200/56 0.5 0.2 0.25 0.1 0.25 0.05 0.25 0.025 0 0 10G min See graphs
0.25 WH100: 0.5 0
Note: A 0.05 ohm addition is to be added to the performance of all resistors < 10 ohms.
Pulse and Overload Performance
For short durations of 0.1s the energy graph should be used. For longer durations the overload graph applies.
10 Multiple of Rated Power
1000 Energy (joules)
100
WH300 WH200 WH100 WH50
WH25-300
10
WH5&10
1
WH5-50 WH100-300
WH25 WH10 WH5
1 0.1 1 10 Overload Duration (s) 100 1000
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 with heatsink compound before mounting to obtain the stated operating characteristics. The heatsink compound increases thermal conductivity to the heatsink.
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 test data and is considered accurate at time of print.
(c)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
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. Reference heatsink dimensions
Type (CECC) Thickness (mm) WH5 (AA) 1 WH10 (BA) 1 WH25 (CA) 1 WH50 (DA) 1 WH50 @ 50W 1.5 WH100 3 WH200 3 WH300 3 Area (cm) 410 410 544 544 930 1000 3800 5800
Derating for reduced heatsink dimensions
1000
WH300 25C WH300 70C WH200 25C WH200 70C
Ma xim um Dis sipa tion (W)
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 WH5/AA 70C
Derating for ambient temperature
1 20 Proportion of Pr (%) 1 00 80 60 40 20 0 0 10 0 20 0 A m b ie n t T e m p e ra tu r e ( C )
10
1 1 10 100
Heatsink Surface Area (cm )
2
1000
10000
WH200 and WH300 are supplied with a set of four M6 nuts and washers. The screw terminations can support a maximum tightening torque of 5Nm.
Packaging
WH5-100 resistors are packed in plastic bags and boxed. WH200 & 300 are individually boxed.
Ordering Procedure
Example: WH25 at 100 ohms with a 5% tolerance: WH25-100RJI Type Value (use IEC62 code) Tolerance (use IEC62 code)
F G 1% 2% J K 5% 10%
Packing
I Bulk All Sizes Standard
The following options apply to WH5 - 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
Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own test data and is considered accurate at time of print.
(c)Welwyn Components Limited
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com

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