Low Profile Aluminium Housed

Power Resistors

WCCHB / WCDH Series

www.bitechnologies.com www.irctt.com www.welwyn-tt.com

General Note

TT electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT electronics’ own data and is considered accurate at time of going to print.

© TT electronics plc

09. 11

Low Profile Aluminium Housed Power Resistors

WCCHB / WCDH Series

Thermal and Overload Data

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

Temperature Derating

0%

20%

40%

60%

80%

100%

120%

-40

-20

0

20

40

60

80

100

Ambient temperature (°C)

Surface Temperature Rise

0

100

200

300

400

500

0%

50%

100%

150%

Proportion of Rated Power

Repetitive Overload (120s cycle, heatsink mounted)

0

2

4

6

8

10

12

14

1.0

10.0

100.0

Duration (s)

600

650

900

950

1300

1400

1600

1800

OBSOLETE