C&H Technology RWST User Manual

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Suite 108
Minnetonka, MN 55345

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

Technical

Application

Assembly

Availability

Pricing

Phone – 1-800-274-4284

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RWST

Vishay Sfernice

Fixed Wirewound High Power Vitreous Resistors

Electrical Traction Model

FEATURES

• 95 Watt to 800 Watt at 25 °C

• NF C 93-214

• RB 25 × 168, RB 30 × 250

• Rugged construction for use in severe environmental

“CS” Type 1 Collars

The RWST vitreous wirewound high power resistors are known for their excellent reliability which has developed out of the
VISHAY SFERNICE experience over several decades in the field of high current applications.

Extremely severe conditions of use are encountered in electrical traction including repeated overloads. To withstand such
conditions the new RWST model is extremely rugged and is manufactured to a very carefully monitored process using the best
materials.

DIMENSIONS in millimeters

conditions

STAINLESS STEEL 304 L COLLARS “CS” TYPE

A

D

Ø B

G
H

E

26

15

J

Ø C

F

STAINLESS STEEL 304 L COLLARS “CS” TYPE

A

23

3

Ø B

G

H15

58

DIMENSIONS IN MILLIMETERS

RWST STYLE 25 × 138 25 × 168 30 × 250 40 × 370 50 × 373

Connections

A ± 2 138 168 250 370 373

Ø B max. 28 28 33 45 53

Ø C min. 12 12 17 22 27.1

D 50 ± 1.5 50 ± 1 60 ± 1.5 69 max. 80 max.

E 27 ± 1 27 ± 1 30 ± 1 45 ± 1.5 51 ± 1.5

F ± 0.5 24 24 25 30 30

G - 4

- 0

H - 4

- 0

J ± 0.5 6.5 6.5 9 9 9

Average unit

weight in g

(CS collars)

CS

Type 1/B/AN

199 229 317 432 432

169 199 287 405 405

225 250 445 1400 2200

CS

Type 1/B/AN

CS

Type 1/B/AN

CS

Type 2/B/AN

E

J

Type 2/AN

D

F

CS

www.vishay.com For technical questions, contact: [e-mail] Document Number: 50017
61 Revision: 23-Oct-06

RWST

Fixed Wirewound High Power Vitreous Resistors

Vishay Sfernice

Electrical Traction Model

MECHANICAL SPECIFICATIONS

Mechanical Protection Vitreous enamel
Resistive Element Ni-Cr wire
Connections CS supporting collars
AN Collar or B on Request
Average Unit Weight 225 to 2200 g

ENVIRONMENTAL SPECIFICATIONS

Temperature Limits - 55 °C + 450 °C
Climatic Category - 55 °C/+ 200 °C/56 days

PERFORMANCE

TESTS CONDITIONS REQUIREMENTS

Short Time Overload

Climatic Sequence - 55 °C + 200°C

Humidity
(Steady State)

Thermal Shock

Shock

Vibration severity 55B 1 % or 0.05 Ω 0.25 %

Terminal Strength AN

B

Load Life

Load at 100 % Pr followed by cold

temperature exposure at - 55 °C/15’

10 Pr during 5 s

Voltage limited at < 5000 V

56 days

95 % relative humidity

severity 50 A

9 shocks/each side

Traction 40 Ncm

Torque 60 Ncm

90’/30’ cycle

1000 h at Pr 25 °C

ELECTRICAL SPECIFICATIONS

Resistance Range

Resistance Tolerance

Standard ± 5 %

Power Rating 95 W to 800 W at 25 °C

Temperature Coefficient 75 ppm/°C (typical)

Shelf Life 0.1 % year (typical)

2 % or 0.05 Ω 0.5 %

2 % or 0.05 Ω

Insulation resistance 100 MΩ

3 % or 0.05 Ω

Insulation resistance 100 MΩ

2 % or 0.05 Ω 0.5 %

1 % or 0.05 Ω 0.25 %

1 % or 0.05 Ω 0.5 %

5 %

E12-E24 preferred series values)

2.7 Ω to 430 kΩ

TYPICAL VALUES AND

DRIFTS

0.5 %

0.5 %

1000 h 1 %

5000 h 2 %

SPECIAL FEATURES

RWST STYLE 25 x 138 25 x 168 30 x 250 40 x 370 50 x 373

Designation NF C 93-214 - RB 25 × 168 RB 30 × 250 - -

Power Rating at 25 °C 95 W 160 W 280 W 500 W 700 W

Maximum Power
Rating at 25 °C P max.

Ohmic Range
(E12, E24 series)

Limiting Element Voltage 1400 V 1900 V 3000 V 4500 V 5000 V

Critical Resistance 18 kΩ 20 kΩ 30 kΩ 36 kΩ 30 kΩ

110 W 180 W 320 W 600 W 800 W

2.7 Ω 82 kΩ 2.7 Ω 100 kΩ 4.7 Ω 220 kΩ 8.2 Ω 360 kΩ 12 Ω 430 kΩ

NON INDUCTIVE WINDING

For high frequencies, low self induction resistors are available with special windings.
RWSTNI designation.

MODEL AND
STYLE

OHMIC RANGE
(E12 SERIES)

Document Number: 50017 For technical questions, contact: [e-mail]
Revision: 23-Oct-06 62

RWSTNI
25 × 138

22 Ω

2.5 kΩ

RWSTNI
25 × 168

22 Ω
4 kΩ

RWSTNI
30 × 250

120 Ω

6.8 kΩ

RWSTNI
40 × 370

120 Ω

8.2 kΩ

RWST NI
50 × 373

150 Ω

8.2 kΩ

www.vishay.com

RWST

Vishay Sfernice

POWER RATING CHART

TEMPERATURE RISE

Fixed Wirewound High Power Vitreous Resistors

Electrical Traction Model

100

REWOP DETAR %

75

50

25

0

0 65 130 195 260 325 390 455

AMBIENT TEMPERATURE IN DEGREES CELSIUS

400

C
°

NI ERUTAR

300

RWST 25 × 168

RWST 25 × 138

RWST 40 × 370

RWST 30 × 250

RWST 50 × 373

EP
MET

200

TOPS T

100

OH

0

10 100 1000

RATED POWER IN WATTS

PACKAGING

Box: Fixed quantity depending on size and connections.

MARKING

SFERNICE trademark, model, style, nominal resistance (in Ω), tolerance (in %), manufacturing date.

ORDERING INFORMATION

RWST 25 × 138 B 56U ± 5 % B06 e

MODEL STYLE NON-INDUCTIVE

BOBINAGE

Optional

SPECIAL

DESIGN

Optional

CONNECTIONS OHMIC VALUE

Custom items are

subject to extra-charge

and min. order.

Please see price list.

TOLERANCE PACKAGING LEAD

(Pb)-FREE

SAP PART NUMBERING GUIDELINES

RWST 25138 B 56R0 J B06

MODEL STYLE CONNECTIONS OHMIC VALUE TOLERANCE PACKAGING

www.vishay.com For technical questions, contact: [e-mail] Document Number: 50017
63 Revision: 23-Oct-06