RWST
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
Vishay Sfernice
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Vitreous enamel
Resistance Range
2.7Ω to 430kΩ
Ni-Cr wire
(E12-E24 preferred series values)
CS supporting collars
on Request
AN Collar or B
Resistance Tolerance
Average Unit Weight
225 to 2200g
Standard
± 5%
Power Rating
95W to 800W at 25°C
75ppm/°C (typical)
0.1% year (typical)
ENVIRONMENTAL SPECIFICATIONS
Temperature Coefficient
Shelf Life
Temperature Limits
– 55°C + 450°C
Climatic Category
– 55°C/+ 200°C/56 days
PERFORMANCE
TYPICAL VALUES AND DRIFTS
TESTS
CONDITIONS
REQUIREMENTS
2% or 0.05Ω
10Pr during 5s
Voltage limited at < 5000V
Short Time Overload
Climatic Sequence
0.5%
– 55°C
+ 200°C
2% or 0.05Ω
Insulation resistance 100MΩ
0.5%
0.5%
56 days
95% relative humidity
Humidity
(Steady State)
3% or 0.05Ω
Insulation resistance 100MΩ
Load at 100% Pr followed by cold
temperature exposure at –55°C/15’
Thermal Shock
Shock
0.5%
0.25%
0.25%
0.5%
2% or 0.05Ω
1% or 0.05Ω
1% or 0.05Ω
1% or 0.05Ω
severity 50A
9 shocks/each side
severity 55B
Vibration
AN
B
Traction 40Ncm
Torque 60Ncm
Terminal Strength
1000h
5000h
1%
2%
90’/30’ cycle
1000h at Pr 25°C
Load Life
5%
SPECIAL FEATURES
RWST STYLE
25 x 138
25 x 168
RB 25 x 168
30 x 250
RB 30 x 250
280W
40 x 370
–
50 x 373
–
Designation NF C 93-214
Power Rating at 25°C
–
95W
160W
180W
500W
700W
Maximum Power
Rating at 25°C
110W
600W
800W
P max.
320W
Ohmic Range
4.7Ω
220kΩ
2.7Ω
82kΩ
2.7Ω
100kΩ
8.2Ω
360kΩ
12Ω
430kΩ
5000V
30kΩ
(E12, E24 series)
3000V
Limiting Element Voltage
1400V
1900V
4500V
30kΩ
Critical Resistance
18kΩ
20kΩ
36kΩ
NON INDUCTIVE WINDING
For high frequencies, low self induction resistors are available with special windings.
RWSTNI designation.
MODEL AND
STYLE
RWSTNI
RWSTNI
RWSTNI
RWSTNI
RWSTNI
25 x 138
25 x 168
30 x 250
40 x 370
50 x 373
120Ω
6.8kΩ
Ohmic range
(E12 series)
22Ω
2.5kΩ
120Ω
8.2kΩ
150Ω
8.2kΩ
22Ω
4kΩ
www.vishay.com
62
Document Number: 50017
Revision 13-Jan-04
For technical questions, contact sfer@vishay.com
