General Purpose Power

Wirewound Resistors

PW Series

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.

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

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PW-20E

PW-30

PW-40

PW-50E

Power rating at 25°C

watts

20

30

40

50

Resistance range

ohms

0R1 to 2K

0R5 to 1K2

0R65 to 1K5

0R08 to 1K8

Electrical Data

Issue B · 03.02

A subsidiary of

TT electronics plc

Welwyn Components

Please note: When ordering the alternative configuration please add an ‘A’ after the part number. (i.e., PW-2A)

0.032

±0.0025

0.205 or 0.187

±0.005

0.157

±0.020

0.250 (Typ.)

0.5

±0.030

0.5

±0.030

5/32 Dia. Thru (2)

A

0.069

±0.005

0.25

±0.031

0.032

±0.0025

0.375

0.200 (Typ.)

0.135

±0.015

0.25

0.75

0.282

±0.020

0.75

±0.030

0.75

±0.030

0.875

5/32 Dia. Thru (2)

A

B

0.125

±0.015

PW-20E Wirewound

PW-30, 40 and 50E Wirewound

PW-20E Alternate Terminal Configuration

Printed Circuit Terminal

Dimensions (Inches)

A ±0.030

B ±0.060

PW-20E

1.875

2.50

PW-30

2.00

2.55

PW-40

2.45

3.00

PW-50E

3.075

3.625

2.000

±0.040

0.187

±0.010

1.410

±0.040

1.050 Min.

0.060 Dia. (2)

0.500

±0.030

0.500

±0.030

0.840

±0.040

0.250 min.

0.020

PW-15E

100

80

60

40

20

0

0

50

100

150

200

250

Ambient Temperature (

°C)

PW-20E, PW-30, PW-40

PW-50E without bracket

300

250

200

150

100

50

0

0

25

50

75

100

125

Percent of Rated Load

PW-30

PW-40

PW-50E

PW-20E

With Bracket:

PW-30 Increased to 40 watts

PW-40 Increased to 50 watts

PW-50 Increased to 60 watts

Power Derating

Temperature Rise