C&H Technology RA User Manual

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Suite 108
Minnetonka, MN 55345

www.chtechnology.com

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Fax [phone]

1-800-274-4284

Thank you for downloading this document from C&H Technology, Inc.

Please contact the C&H Technology team for the following questions -

Technical

Application

Assembly

Availability

Pricing

Phone – 1-800-274-4284

E-Mail – [e-mail]

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RA

Vishay Sfernice

Adjustable Wirewound Enamelled Resistors

FEATURES

• 21 Watt to 180 Watt at 25°C

• NF C 93-214

- RBA 13 x 70

- RBA 20 x 117

- RBA 25 x 168

”B” Ring

The ceramic tubular core ensures high dissipation capacity and excellent resistance to thermal shock and overload. The resistor
winding is evenly coiled on the core and protected by an enamel coating. A longitudinal opening provides for one or more
electrical connections by means of sliding collars equipped with a tongued connector.

DIMENSIONS in millimeters

WELDED STAINLESS STEEL 304 L BAND “B”

DIMENSIONS in millimeters

A

F

ØB

Ø4.2

D

O

E

ØC

K

4

5

°

J

WELDED STAINLESS STEEL 304 L COLLAR “AN” TYPE 1

M

ØS

ØC

ØB

V

ZT

A

X

4

R

SCREWED STAINLESS STEEL 304 L “CS” TYPE 1

A

P

26

ØB

L

N

H

15

U

4

5

°

Q

5

°

RA
MODEL

13 x 70 16 x 94 20 x 117 25 x 138 25 x 168 30 x 250

Connection AN-B* AN-B AN-B AN-B-CS AN-B-CS AN-B-CS

A ± 2 70 94 117 138 168 250

Ø B max. 16 19.5 23 28 28 33

Ø C min. 5 9 9 12 12 17

D 16 ± 0.5 17.5 ± 0.5 21 ± 0.7 23.5 ± 1 23.5 ± 1 26 ± 1

E + 0.5

+ 0

F + 0.5

+ 0

788888

10.5 12 14 15 15 18

H ± 1 - - - 27 27 30

J max 19.523 2527.527.530

K max 24 29.5 31.5 34 34 36.5

L - 0

- 4

- - - 199 229 317

M 56 ± 2 78 ± 2 98 ± 2 117 ± 2 147 ± 2 227 ± 2.5

N - 0

- 4

- - - 169 199 287

O max 24.5 28 33 38.5 38.5 43.5

P ± 1.5 – – – 50 50 60

Q ± 0.5 – – – 24 24 25

R 24 ± 0.5 26.5 ± 0.5 31 ± 0.7 33.5 ± 1 33.5 ± 1 36 ± 1

S 4.2 4.2 4.2 5.7 5.7 5.7

T 6.35 6.35 6.35 9 9 13

U ± 0.5 –––6.56.59

V 20 ± 0.5 21 ± 0.5 24 ± 0.7 28.5 ± 1 28.5 ± 1 33 ± 1

X 34.5 ± 1 38 ± 1 42 ± 1 51 ± 1.5 51 ± 1.5 55 ± 1.5

Z approx 3.5 56665

Average
unit

40 70 116 200 225 415

weight in g

* Also with CS and CR collars. See RW data sheet.

www.vishay.com For technical questions, contact: [e-mail] Document Number: 50019
67 Revision: 21-Jun-06

RA

Adjustable Wirewound Enamelled Resistors

Vishay Sfernice

MECHANICAL SPECIFICATIONS

Mechanical Protection vitreous enamel
Resistive Element Ni-Cr wire
Connections B band

AN or CS collar

Average Unit Weight 40 to 415g

ENVIRONMENTAL SPECIFICATIONS

Temperature Limits - 55 °C + 350 °C
Climatic Category - 55 °C/+ 200 °C/56 days

ELECTRICAL SPECIFICATIONS

Resistance Range 33 to 22K

(E6 series)

Tol erance

Standard ± 10 %

Power Rating 21 W to 180 W at 25 °C

Temperature Coeffi cient + 75 ppm/°C (typical)

PERFORMANCE

TESTS CONDITIONS REQUIREMENTS TYPICAL VALUES AND DRIFTS

Short Time Overload 10 Pr 5 s

Climatic sequence - 55 °C + 200 °C

Humidity

(Steady State)

Thermal Shock Load at Pr

Resistor Strength 200N ± 10N 2 % or 0.05 0.25

Vibration 55/10 1 %* or 0.05 0.5

Terminal Strength AN

Load Life 1000 hours at Pr

* 1 % of total resistance and 2 % between sliding collar and fixed connection.

B

followed by exposure at - 55°C/15

Voltage < 6000V

5 cycles

56 days

95 % R.H.

Traction 40 Ncm

Torque 60 Ncm

25 °C

90 /30

Insulation resistance > 100M

Insulation resistance > 100M

2

%

or 0.05 0.5

3 % or 0.05

2 % or 0.05

2 % or 0.05 0.5

1 % or 0.05 0.25 %

5

%

1.5 %

0.5

%

1

%

%

%

%

%

SPECIAL FEATURES

RA STYLE 13 x 70 16 x 94 20 x 117 25 x 138 25 x 168 30 x 250

Designation NF C 93-214 RBA 13 x 70 - RBA 20 x 117 - RBA 25 x 168 -

Power Rating NF C 93-214
at 25 °C

Maximum Power
Rating at 25 °C

Ohmic Range
(E6, E24 series)

13 W - 25 W - 50 W -

21 W 35 W 50 W 75 W 120 W 180 W

33 3.9K 68 3.9K 100 4.7K 150 6.8K 220 10K 330 22K

ADMISSIBLE RATED AMPERAGE

This must in all cases be less than:

PrW()

in

----------------­Rn()

SLIDING COLLAR

Resistors are normally supplied with 1 sliding collar fi tted and locked in a specifi c position.
Additional collars can be supplied and adjusted at the factory to special order (on request).*
* Quote ohmic value and tolerance of each resistance section, and Rn value.

MAXIMUM ADDITIONAL COLLARS

MODEL
AND TYPE

Additional
sliding collar

Document Number: 50019 For technical questions, contact: [e-mail]
Revision: 21-Jun-06 68

RA

13 x 70

111234

RA

16 x 94

RA

20 x 117

RA

25 x 138

RA

25 x 168

RA

30 x 250

www.vishay.com

RA

Vishay Sfernice

POWER RATING CHART

TEMPERATURE RISE

Adjustable Wirewound Enamelled Resistors

100

75

50

% RATED POWER

25

0

0 50 100 150 200 250 300 350

AMBIENT TEMPERATURE IN DEGREES CELSIUS

400

300

A

R

RA 13 x 70

4

9

x

6

0 x

1

2

A

R

8

8

17

3

1

1

x

5

2

A

A

R

R

0

6

5

1

2

x

x

5

0

2

3

A

R

200

100

HOT SPOT TEMPERATURE IN ¡C

0

10 100 1000

RATED POWER IN WATTS

MARKING

SFERNICE trademark, model, style, NF style (if applicable) ohmic value (in Ω), tolerance (in %), manufacturing date.

ORDERING INFORMATION

RA 13 × 70 AN 470U ± 10 % 1 C. SUP. B010 e

MODEL STYLE SPECIAL

DESIGN

CONNECTIONS OHMIC

VAL U E

TOLERANCE ADDITIONAL

SLIDING

PACKING LEAD

COLLAR

In option Custom items are subject

to extra-charge and min. order.

Please see price list.

SAP PART NUMBERING GUIDELINES

RA 13 × 70 G 470R0 K B10

MODEL STYLE CONNECTIONS OHMIC VALUE TOLERANCE PACKING

(Pb)-FREE

www.vishay.com For technical questions, contact: [e-mail] Document Number: 50019
69 Revision: 21-Jun-06