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111

Series Wattage

Length L

Length A

F10

10

0.750 / 19.050

1.000 / 25.400

F20

20

2.000 / 50.800

2.313 / 58.750

F30

30

1.250 / 31.750

2.000 / 50.800

F40

40

2.000 / 50.800

2.750 / 69.850

F55

55

3.500 / 88.900

4.250 / 107.950

0.625"

15.875 mm

0.031"

0.794 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.125"

3.175 mm

L

A

0.110":

2.776 mm

0.250"

6.350 mm

0.375"

9.525 mm

10W & 20W

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

L

A

0.250"

6.350 mm

0.125"

3.175 mm

0.438"

11.113 mm

30W, 40W & 55W

0.125" *

3.175 mm

0.250" *

6.350 mm

*Reference dimension only; varies according to resistance

value.

Note:

When resistors are stacked, use washers or spacers

as required to insure clearance and improve power dissipa-

tion.

250 Series

‘Thin’ Stackohm®

Vitreous Enamel Power

dime NS i ONS

(in. / mm)

0.625"

15.875 mm

0.031"

0.794 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.125"

3.175 mm

L

A

0.110":

2.776 mm

0.250"

6.350 mm

0.375"

9.525 mm

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

L

A

0.250"

6.350 mm

0.125"

3.175 mm

0.438"

11.113 mm

T

T

B

W

W

B

0.094"

2.381 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.196"

4.979 mm

L

A

0.125"

3.175 mm

0.438"

11.113 mm

T

B

0.813"

20.638 mm

Core

size

Core

size

Core

size

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

L

A

0.125"

3.175 mm

0.438"

11.113 mm

(SS)

T

B

W

Core

size

0.188"

4.763 mm

0.250"

6.350 mm

0.531"

13.494 mm

(SSH)

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

0.156" x0.313"

3.969 x 7.938 mm

Slot

L

A

0.5"

12.7 mm

T

B

W

Core

size

0.188"

4.763 mm

Brackets

cemented

in core

mO u N ti N g

Inadditiontothestandardboxbracket,studtypebrackets

areavailableforstackingthestandardsizeresistors.Stud

typebracketsareavailableintwoheights:standard(SS,

0.437”/11.113mm)andhigh(SSH,0.531”/13.494mm).The

SSHstudisrecommendedwhenstackingtheadjustableType

260,asitassuresclearancefortheadjustablelugstopass

eachother.SpacerwasherNo.6027(O.D.0.219”/5.556mm,

I.D.0.125”/3.175mm,thickness0.094”/2.381mm)isrecom-

mendedforusewiththeminiatureadjustableandfixedresis-

torstoprovideclearance,asexplainedabove,orincreased

wattage.Seechart.

Derating for stacked mounting

Stackedresistorsshouldbederatedtopreventexcessivetem-

peraturesduetoproximity.Approximateratingsaregivenin

thetable.

2

70

70

75

3

60

60

69

4

50

50

60

Miniature with

0.094” (2.381 mm)

Spacer Washer

Miniature

Std. or Inter.

Percent of Single Unit Rating

No. of

Resistors

(continued)