OVSF

www.vishay.com

Vishay Milwaukee

Revision: 08-Oct-13

1

Document Number: 31835

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

Wirewound Resistors, Industrial Power, Tubular, Flat,

Oval, Fixed, OVSF

FEATURES

• Terminal bands are spotwelded onto the

insulated core and resistance-alloy wire is

precisely wound onto the oval core

• The wire is spotwelded to the terminal bands

and then “locked” onto the core with a silicone

or cement coating

• Available as fixed and adjustable resistors (for adjustable

•Wirewound

• Material categorization: For definitions of compliance

Notes

• Ratings are based on a temperature rise of 300 °C above an ambient of 40 °C.

 and adjustable have ± 10 % tolerance. Closer tolerances

available upon request.

Notes

• Ratings are based on mounting on a steel panel 10" x 10" x 0.040". Derate by 29 % when mounting on non-heat conductive surface.

STANDARD ELECTRICAL SPECIFICATIONS

GLOBAL MODEL

HISTORICAL

MODEL

POWER RATING

W

RESISTANCE

RANGE



± %

TERMINAL STYLE

OVSF0030

16-20

 Oval

30

1.2 to 7.3K

5

A

OVSF0040

16-32

 Oval

40

1.7 to 27K

5

A

OVSF0055

16-56

 Oval

55

2.4 to 85K

5

A

OVSF0070

16-76

 Oval

70

3.0 to 137K

5

A

OVSF0095

16-96

 Oval

95

4.1 to 171K

5

A

DERATING FOR GROUP INSTALLATIONS

NUMBER OF RESISTORS

STACKED

% OF SINGLE RATING

VERTICAL CHASSIS

HORIZONTAL CHASSIS

280

75

370

60

465

50

DIMENSIONS in inches (millimeters)

GLOBAL MODEL

DISTANCE BETWEEN TERMINALS

OVERALL LENGTH

WEIGHT (TYP.)

g

AL

OVSF0030

2 (50.8)

1.25 (31.75)

= A + 0.625 (15.875)

15

OVSF0040

2.75 (69.85)

2 (50.8)

= A + 0.625 (15.875)

24

OVSF0055

4.25 (107.95)

3.5 (88.9)

= A + 0.625 (15.875)

37

OVSF0070

5.5 (139.7)

4.75 (120.65)

= A + 0.625 (15.875)

45

OVSF0095

6.75 (171.45)

6 (152.4)

= A + 0.625 (15.875)

60