VISHAY RWST Technical data

A

23

3

ØB

58

D

E

F

G

H

15

J

查询RWST25X138NICS供应商

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 x 168, RB 30 x 250

• Rugged construction for use in severe environmental
conditions

“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 fi eld 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

STAINLESS STEEL 304 L COLLARS “CS” type STAINLESS STEEL 304 L COLLARS “CS” type

A

D

ØB

G
H

26

15

ØC

E

F

J

DIMENSIONS in millimeters

RWST STYLE

Connections

A ± 2

Ø B max.

Ø C min.

D

E

F ± 0.5
– 4

– 0
– 4

H
– 0

G

J ± 0.5

Average unit
weight in g
(CS collars)

Document Number: 50017
Revision 13-Jan-04

Type 1/B/AN

25 x 138

CS

138

28

12

50 ± 1.5

27 ± 1

24

199

169

6.5

225

For technical questions, contact [e-mail]

25 x 168

CS

Type 1/B/AN

168

28

12

50 ± 1

27 ± 1

24

229

199

6.5

250

30 x 250

CS

Type 1/B/AN

250

33

17

60 ± 1.5

30 ± 1

25

317

287

9

445

40 x 370

CS

Type 2/B/AN

370

45

22

69 max.

45 ± 1.5

30

432

405

9

1400

50 x 373

CS

Type 2/B/AN

373

53

27.1

80 max.

51 ± 1.5

30

432

405

9

2200

www.vishay.com

61

RWST

Vishay Sfernice

Fixed Wirewound High Power Vitreous Resistors

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 2200g

ENVIRONMENTAL SPECIFICATIONS

Temperature Limits – 55°C + 450°C

Climatic Category – 55°C/+ 200°C/56 days

PERFORMANCE

TESTS CONDITIONSREQUIREMENTS

Short Time Overload

Climatic Sequence

Humidity
(Steady State)

Thermal Shock

Shock

Vibration

Terminal Strength

Load Life

– 55°C + 200°C

AN Traction 40Ncm
B Torque 60Ncm

10Pr during 5s

Voltage limited at < 5000V

56 days

95% relative humidity

Load at 100% Pr followed by cold

temperature exposure at –55°C/15’

severity 50A

9 shocks/each side

severity 55B

90’/30’ cycle

1000h at Pr 25°C

ELECTRICAL SPECIFICATIONS

Resistance Range 2.7Ω to 430kΩ

(E12-E24 preferred series values)

Resistance Tolerance

Standard ± 5%

Power Rating 95W to 800W at 25°C

Temperature Coeffi cient 75ppm/°C (typical)

Shelf Life 0.1% year (typical)

2% or 0.05Ω

2% or 0.05Ω

Insulation resistance 100MΩ

3% or 0.05Ω

Insulation resistance 100MΩ

2% or 0.05Ω

1% or 0.05Ω

1% or 0.05Ω

1% or 0.05Ω

5%

TYPICAL VALUES AND DRIFTS

0.5%

0.5%

0.5%

0.5%

0.25%

0.25%

0.5%

1000h 1%

5000h 2%

SPECIAL FEATURES

RWST STYLE

Designation NF C 93-214

Power Rating at 25°C

Maximum Power

Rating at 25°C
Ohmic Range

(E12, E24 series)

Limiting Element Voltage

Critical Resistance

P max.

25 x 138

–

95W

110W

2.7Ω 82kΩ

1400V

18kΩ

25 x 168

RB 25 x 168

160W

180W

2.7Ω 100kΩ

1900V

20kΩ

30 x 250

RB 30 x 250

280W

320W

4.7Ω 220kΩ

3000V

30kΩ

40 x 370

–

500W

600W

8.2Ω 360kΩ

4500V

36kΩ

50 x 373

700W

800W

12Ω 430kΩ

5000V

30kΩ

NON INDUCTIVE WINDING

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

MODEL AND
STYLE

Ohmic range
(E12 series)

www.vishay.com
62

RWSTNI
25 x 138

22Ω

2.5kΩ

RWSTNI
25 x 168

22Ω
4kΩ

For technical questions, contact [e-mail]

RWSTNI
30 x 250

120Ω

6.8kΩ

RWSTNI
40 x 370

120Ω

8.2kΩ

RWSTNI
50 x 373

150Ω

8.2kΩ

Document Number: 50017

Revision 13-Jan-04

–