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 25

°C

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 200°C)

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 25

°C

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 200°C)

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 25

°C

watts

100

200

300

On standard heatsink

Resistance range

ohms

0R01 to 70K

0R01 to 50K

0R01 to 68K

TCR (-55° to 200°C)

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 Welwyn’s 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