Tubular Cement Coated
Wirewound Resistors
CW Series
Welwyn Components
•
•
•
•
•
Forced air cooling to 90 watts
All welded construction
Flameproof protection
Suitable for automotive application
Weldable terminations
Electrical Data
CW10
Power rating at 25°C
Resistance range
Limiting element voltage
TCR 20° - 70°C
Resistance tolerance (Code)
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
23
-55 to +280
watts
ohms
volts
ppm/°C
%
10
0.35 to 6K
250
150
5 (J), 10 (K)
E24
11
Other values available
CW20
20
0.3 to 18K
600
Notes
Physical Data
Dimensions (mm)
Type
L
±0.75
CW10
34.25
CW20
41.75
D
max.
12.00
22.50
T
±0.15
5.00
5.00
6.35
±0.2
13.00
±0.35
14.00
22.00
0.361
5
L
d
D
T
E
d
A
max.
9.00
B
max.
16.50
E
nom.
0.361
F
min.
6
F
A
B
Construction
Precision stainless steel collars are welded onto a high purity
ceramic tube. The wire element is wound onto the ceramic
tube using controlled tension for optimum performance.
Electrical connections are welded to ensure good electrical
stability and high reliability. The resistors are coated with
flameproof cement which provides electrical, mechanical and
climatic protection. Finally all components are legend marked
with indelible ink.
Marking
All components are legend marked with type reference,
resistance value and tolerance. Special custom marking is
available by negotiation.
Solvent Resistance
The marking and protection will withstand all commonly used
industrial cleaning fluids suitable for electronic components.
Terminations
Material
The terminations are produced from top quality
stainless steel for maximum corrosion resistance.
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 data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Issue C · 04.03
© 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
119
WELWYN [ WELWYN COMPONENTS LIMITED ]
