Document Number: 50017

Revision 13-Jan-04

www.vishay.com

62

RWST

Vishay Sfernice

For technical questions, contact sfer@vishay.com

NON INDUCTIVE WINDING

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

RWSTNI designation.

MODEL AND

STYLE

Ohmic range

(E12 series)

22Ω

2.5kΩ

RWSTNI

25 x 138

22Ω

4kΩ

RWSTNI

25 x 168

120Ω

6.8kΩ

RWSTNI

30 x 250

120Ω

8.2kΩ

RWSTNI

40 x 370

150Ω

8.2kΩ

RWSTNI

50 x 373

TESTS

CONDI

TIONSREQUIREMENTS

TYPICAL VALUES AND DRIFTS

Short Time Overload

10Pr during 5s

Voltage limited at < 5000V

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%

0.5%

0.5%

0.5%

0.5%

0.25%

0.25%

0.5%

1000h

1%

5000h

2%

– 55°C

+ 200°C

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

Climatic

Sequence

Humidity

(

Steady State)

Thermal Shock

Shock

Vibration

Terminal Strength

Load Life

PERFORMANCE

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

Resistance Range

2.7Ω to 430kΩ

(E12-E24 preferred series values)

Resistance Tolerance

Standard

± 5%

Power

Rating

95W to 800W at 25°C

Temperature Coefficient

75ppm/°C (typical)

Shelf Life

0.1% year (typical)

ELECTRICAL SPECIFICATIONS

RWST STYLE

Designation NF C 93-214

Limiting Element Voltage

Critical

Resistance

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

Power

Rating at 25°C

Maximum Power

Rating at 25°C

P max.

Ohmic

Range

(E12, E24 series)

SPECIAL FEATURES

AN

Traction 40Ncm

B

Torque 60Ncm