Rwst, Vishay sfernice – C&H Technology RWST User Manual
Page 3
RWST
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
Vishay Sfernice
Document Number: 50017
For technical questions, contact: [email protected]
www.vishay.com
Revision: 23-Oct-06
62
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
NON INDUCTIVE WINDING
For high frequencies, low self induction resistors are available with special windings.
RWSTNI designation.
ELECTRICAL SPECIFICATIONS
Resistance Range
2.7
Ω to 430 kΩ
E12-E24 preferred series values)
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)
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
TYPICAL VALUES AND
DRIFTS
Short Time Overload
10 Pr during 5 s
Voltage limited at < 5000 V
2 % or 0.05
Ω
0.5 %
Climatic Sequence
- 55 °C
+ 200°C
2 % or 0.05
Ω
Insulation resistance 100 M
Ω
0.5 %
Humidity
(Steady State)
56 days
95 % relative humidity
3 % or 0.05
Ω
Insulation resistance 100 M
Ω
0.5 %
Thermal Shock
Load at 100 % Pr followed by cold
temperature exposure at - 55 °C/15’
2 % or 0.05
Ω
0.5 %
Shock
severity 50 A
9 shocks/each side
1 % or 0.05
Ω
0.25 %
Vibration
severity 55B
1 % or 0.05
Ω
0.25 %
Terminal Strength
AN
B
Traction 40 Ncm
Torque 60 Ncm
1 % or 0.05
Ω
0.5 %
Load Life
90’/30’ cycle
1000 h at Pr 25 °C
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.
110 W
180 W
320 W
600 W
800 W
Ohmic Range
(E12, E24 series)
2.7
Ω
82 k
Ω
2.7
Ω
100 k
Ω
4.7
Ω
220 k
Ω
8.2
Ω
360 k
Ω
12
Ω
430 k
Ω
Limiting Element Voltage
1400 V
1900 V
3000 V
4500 V
5000 V
Critical Resistance
18 k
Ω
20 k
Ω
30 k
Ω
36 k
Ω
30 k
Ω
MODEL AND
STYLE
RWSTNI
25 × 138
RWSTNI
25 × 168
RWSTNI
30 × 250
RWSTNI
40 × 370
RWSTNI
50 × 373
OHMIC RANGE
(E12 SERIES)
22
Ω
2.5 k
Ω
22
Ω
4 k
Ω
120
Ω
6.8 k
Ω
120
Ω
8.2 k
Ω
150
Ω
8.2 k
Ω