Tubular Cement Coated

Wirewound Resistors

CW Series

© 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

120

Issue C · 04.03

Welwyn Components

Application Notes

If air cooling of these components is employed the power

handling capability is increased substantially. The graphs below

are intended as a guide and testing by the user is recommended.

Maximum

Typical

Notes

Load: 1000 hours at 25°C

∆R%

5

2

Derating from rated power at 25°C

∆R%

Zero at 280°C

Short term overload

∆R%

5

1

5 x Power rating for 10 seconds

Climatic

∆R%

5

1

Tested to BS 40201-002

Temperature rapid change

∆R%

1

0.5

Tested to BS 40201-002

No flow

500

1000

Cu Ft / min

300

250

200

150

100

50

0

0

1020

3040

50

Power watts

No flow

500

1000

Cu Ft / min

300

250

200

150

100

50

0

0

1020

30

4050

6070

80

90

100

Power watts

Graph 1

CW 10 Temperature rise ventilated

Graph 2

CW 20 Temperature rise ventilated

Packaging

Components are packed in custom designed trays and boxes

for maximum protection during transit and ease of use by the

customer.

Type

CW10

CW20

Box

400

150

Shipping box

4000

1500

Performance Data

Standard Quantities Per Box

CW_C.qxd

28/4/03

10:42 am

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