Tubular Cement Coated
Wirewound Resistors
CW Series
Welwyn Components
Performance Data
Maximum
Load: 1000 hours at 25°C
Derating from rated power at 25°C
Short term overload
Climatic
Temperature rapid change
∆R%
∆R%
∆R%
∆R%
∆R%
5
5
1
5
Zero at 280°C
1
1
0.5
5 x Power rating for 10 seconds
Tested to BS 40201-002
Tested to BS 40201-002
Typical
2
Notes
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.
Graph 1
CW 10 Temperature rise ventilated
Temperature rise over ambient
°C
300
250
200
150
100
50
0
0
10
20
30
40
50
Power watts
Cu Ft / min
No flow
500
1000
Graph 2
CW 20 Temperature rise ventilated
Temperature rise over ambient
°C
300
250
200
150
100
50
0
0
10
20
30
40
50
Power watts
60
70
80
90
100
Cu Ft / min
No flow
500
1000
Packaging
Components are packed in custom designed trays and boxes
for maximum protection during transit and ease of use by the
customer.
Standard Quantities Per Box
Type
Box
Shipping box
CW10
400
4000
CW20
150
1500
© 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 [ WELWYN COMPONENTS LIMITED ]
