Vitreous Enamelled

Wirewound Resistors

W20 Series

CECC approved

Suitable for harsh environments

Impervious lead free vitreous enamel coating

Overload characteristics ideal for protection circuits

High stability and reliability

High power dissipation for size

Vitreous Enamelled

Wirewound Resistors

W20 Series

• CECC approved

• Suitable for harsh environments

• Impervious lead free vitreous enamel coating

• Overload characteristics ideal

for protection circuits

• High stability and reliability

• High power dissipation for size

Dimensions (mm) and Weight (g)

Type

L max

D max

f min

d nom

Wt.nom

W21

12.7

5.6

22.75

0.8

1

W215

22.0

7.0

23.1

0.8

2

W22

22.0

8.0

23.1

0.8

2

W23

38.0

8.0

-

0.8

3.5

W24

53.5

8.0

-

0.8

5

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.

© 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

This table indicates the CECC specification requirements, and these are met or exceeded by the corresponding W20 series products

4

2

W

3

2

W

2

2

W

5

1

2

W

1

2

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l

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0

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it

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P

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0

0

1

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1

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0

6

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1

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2

2

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5

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%

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0

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2

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2

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0

6

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2

2

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5

1

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%

5

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<

:

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ll

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p

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C

°

m/

p

p

)

C

°

0

0

2

o

t

°

5

5

-

(

R

C

T

-75

Maximum: +-200

BS CECC 40-201-002 Requirements

Style

JB

HB

KB

LB

MB

0

.

4

1

5

.

0

1

0

.

7

0

.

5

9

.

2

s

t

t

a

w

C

°

5

2

t

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g

n

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r

r

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0

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2

1

0

.

9

0

.

6

3

.

4

5

.

2

s

t

t

a

w

C

°

0

7

t

a

g

n

it

a

r

r

e

w

o

P

K

0

0

1

o

t

R

1

K

6

5

o

t

R

1

K

0

2

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1

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5

1

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1

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0

1

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6

5

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0

2

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5

R

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5

1

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%

2

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0

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1

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2

R

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6

5

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5

1

R

0

K

0

2

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1

R

0

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5

1

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t

1

R

0

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0

1

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1

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0

s

m

h

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n

a

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l

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%

5

C

°

/

m

p

p

)

C

°

0

0

2

o

t

°

5

5

-

(

R

C

T

≥5 ohms < 10 ohms: ±400

≥10 ohms: ±200

Applicable to commercial and approved ranges

0

5

7

0

0

5

0

0

2

0

6

1

0

0

1

s

tl

o

v

e

g

a

tl

o

v

t

n

e

m

e

l

e

g

n

it

i

m

i

L

r

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d

r

o

l

a

i

c

e

p

s

o

t

s

e

u

l

a

v

r

e

h

t

O

.

d

e

r

r

e

f

e

r

p

4

2

E

s

e

u

l

a

v

d

r

a

d

n

a

t

S

2

2

9

2

4

4

8

5

8

8

t

t

a

w

/

C

°

e

c

n

a

d

e

p

m

i

l

a

m

r

e

h

T

0

0

2

o

t

5

5

-

C

°

e

g

n

a

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u

t

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m

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b

m

A

Electrical Data

Physical Data

A subsidiary of

TT electronics plc

Welwyn Components

L

D

f

d

Construction

A high purity ceramic substrate is assembled with interference fit end caps to which are

welded the termination wires. The resistive element is wound on the substrate and welded to

the caps; the vitreous enamel protective coating is then applied.

Terminations

Material

Copper clad steel wire, nickel plated and solder-coated.

Strength

The terminations meet the requirements of IEC 68.2.21.

Solderability The terminations meet the requirements of IEC 115-1,– Clause 4.17.3.2.

Length

W23’s and W24’s are not supplied on tape. Minimum lead length is 30 mm.

Marking

The resistors are legend marked with type reference, resistance value and tolerance. Values are

marked in accordance with IEC 62.

0

5

10

15

20

W21

W215

W22

W24

W23

400

300

200

100

0

Dissipation – Watts

t OM| ` KèñÇ==OULQLMP==NMWNV=~ã==m~ÖÉ=N

Resistors

06.18

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

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)

All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)