Aluminium Housed

Wirewound Resistors

WH Series

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108

Issue D · 03.06

Welwyn Components

CECC

Actual

Notes

40203-006

Maximum

Typical

Load at commercial rating: 1000 hrs at 25°C

∆R %

1.0

1.0

0.4

Load at CECC rating: 1000 hours at 25°C

∆R %

1.0

1.0

0.4

Dry heat: 1000 hours at 200°C

∆R %

1.0

1.0

0.4

Derating from 25°C

Zero at 200°C

Short term overload

∆R %

1.0

1.0

0.2

Climatic sequence

∆R %

1.0

1.0

0.4

Climatic category

55/200/56

Long term damp heat

∆R %

1.0

0.5

0.2

Temperature rapid change

∆R %

0.25

0.25

0.1

Resistance to solder heat

∆R %

0.25

0.25

0.05

Vibration and bump

∆R %

0.25

0.25

0-.025

Noise (in decade of frequency)

µV/V

Not specified

zero

zero

Insulation resistance.

ohms

>1Gohm

>20Tohm

>100Gohm

Isolation voltage : WH5 and 10

volts AC peak

1000 min

1500 min

See application

: WH25 and 50

volts AC peak

2000 min

3000 min

notes

Pulse handling

Data available by request

Performance Data

Dimensions (mm)

Type

AB

C

E

F

Max

±0.3

±0.3

Min

Max

WH5

30.0

12.4

11.3

1.9

17

WH10

36.5

15.9

14.3

1.9

21

WH25

51.0

19.8

18.3

2.8

28

WH50

72.5

21.4

39.7

2.8

30

Type

GH

LM

N

Max

Dia ±0.2

Max

±0.5

Max

WH5

9

2.4

17.0

4.3

1.8

WH10

11

2.4

21.0

5.2

2.2

WH25

15

3.3

29.0

7.2

2.6

WH50

16

3.3

51.0

7.9

2.6

Physical Data