RWST
Vishay Sfernice
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
FEATURES
•
95 W to 800 W 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
•
Compliant to RoHS directive 2002/95/EC
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.
NF F 16101, 10/1988 and 16102, 04/1992: Not applicable (our parts are made of metallic and refractory materials).
NF C 93-214. Performances according to NF C 93-214.
DIMENSIONS
in millimeters
STAINLESS STEEL 304 L COLLARS “CS” TYPE 1
A
ØC
STAINLESS STEEL 304 L COLLARS “CS” TYPE 2
A
D
E
ØB
26
F
3
23
E
ØB
58
G
H
15
F
D
G
H
15
J
J
WELDED STAINLESS STEEL 304 L COLLARS “AN”
N
WELDED STAINLESS STEEL 304 L BAND “B”
ØU
ØB
K V
P
ØC
S
A
Z
L
A
T
ØC
Q
ØB
R
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For technical questions, contact:
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Document Number: 50017
Revision: 12-May-09
RWST
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
DIMENSIONS
in millimeters
RWST STYLE
Connections
A±2
Ø B max.
Ø C min.
D
E
F ± 0.5
G - 4/+ 0
H - 4/+ 0
J ± 0.5
K
L - 0/+ 0.5
N
P
Q - 0/+ 0.5
R - 0.3/+ 0.9
S max.
T±1
ØU
V
Z
Average unit
weight in g
(CS collars)
25 x 138
AN-B
CS type 1
138
28
12
50 ± 1.5
27 ± 1
24
199
169
6.5
28.5 ± 1
9
117 ± 2
51 ± 1.5
15
26
38.5
23.5
5.7
33.5 ± 1
6
225
25 x 168
AN-B
CS type 1
168
28
12
50 ± 1.5
27 ± 1
24
229
199
6.5
28.5 ± 1
9
147 ± 2
51 ± 1.5
15
26
38.5
23.5
5.7
33.5 ± 1
6
250
30 x 250
AN-B
CS type 1
250
33
17
60 ± 1.5
30 ± 1
25
317
287
9
31 ± 1
13
227 ± 2
55 ± 1.5
18
31
43.5
26
5.7
36 ± 1
5
445
40 x 370
AN
CS type 2
370
45
22
69 max.
45 ± 1.5
30
432
405
9
45 ± 1.5
18
332 ± 3
81.5 max.
-
-
-
-
9.2
57 ± 1.5
10
1400
50 x 373
AN
CS type 2
373
53
27.1
80 max.
51 ± 1.5
30
432
405
9
51 ± 1.5
18
332 ± 3
92.5 max.
-
-
-
-
9.2
63 ± 1.5
11.5
2200
Vishay Sfernice
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
AN Collar or B
Average Unit Weight
Vitreous enamel
Ni-Cr wire
CS supporting collars
on Request
225 g to 2200 g
ELECTRICAL SPECIFICATIONS
Resistance Range
Resistance Tolerance
Standard
Power Rating
Temperature Coefficient
Shelf Life
±5%
95 W to 800 W at 25 °C
75 ppm/°C (typical)
0.1 % year (typical)
2.7
Ω
to 430 kΩ
E12-E24 preferred series values)
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits
Climatic Category
- 55 °C + 450 °C
- 55 °C/+ 200 °C/56 days
PERFORMANCE
TESTS
Short Time Overload
Climatic Sequence
Humidity
(Steady State)
Thermal Shock
Shock
Vibration
Terminal Strength
AN
B
CONDITIONS
10 Pr during 5 s
Voltage limited at < 5000 V
- 55 °C + 200 °C
56 days
95 % relative humidity
Load at 100 % Pr followed by cold
temperature exposure at - 55 °C/15'
Severity 50 A
9 shocks/each side
Severity 55B
Traction 40 Ncm
Torque 60 Ncm
90'/30' cycle
1000 h at Pr 25 °C
REQUIREMENTS
2 % or 0.05
Ω
2 % or 0.05
Ω
Insulation resistance 100 MΩ
3 % or 0.05
Ω
Insulation resistance 100 MΩ
2 % or 0.05
Ω
1 % or 0.05
Ω
1 % or 0.05
Ω
1 % or 0.05
Ω
5%
TYPICAL VALUES AND
DRIFTS
0.5 %
0.5 %
0.5 %
0.5 %
0.25 %
0.25 %
0.5 %
1000 h
5000 h
1%
2%
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Load Life
Document Number: 50017
Revision: 12-May-09
For technical questions, contact:
sfer@vishay.com
RWST
Vishay Sfernice
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
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.
2.7
Ω
25 x 138
-
95 W
110 W
82 kΩ
2.7
Ω
25 x 168
RB 25 x 168
160 W
180 W
100 kΩ
1900 V
20 kΩ
4.7
Ω
30 x 250
RB 30 x 250
280 W
320 W
220 kΩ
3000 V
30 kΩ
8.2
Ω
40 x 370
-
500 W
600 W
360 kΩ
4500 V
36 kΩ
12
Ω
50 x 373
-
700 W
800 W
430 kΩ
5000 V
30 kΩ
1400 V
18 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)
RWSTNI
25 x 138
22
Ω
2.5 kΩ
RWSTNI
25 x 168
22
Ω
4 kΩ
RWSTNI
30 x 250
120
Ω
6.8 kΩ
RWSTNI
40 x 370
120
Ω
8.2 kΩ
RWSTNI
50 x 373
150
Ω
8.2 kΩ
POWER RATING CHART
100
% RATED POWER
75
50
25
0
0
65
130
195
260
325
390
455
AMBIENT TEMPERATURE IN °C
TEMPERATURE RISE
400
HOT SPOT TEMPERATURE IN °C
300
200
100
0
10
100
1000
RATED POWER IN W
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For technical questions, contact:
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25
×1
38
ST
25
×1
68
RW
ST
30
×2
50
RW
ST
40
RW
×3
ST
70
50
×3
73
RW
RW
ST
Document Number: 50017
Revision: 12-May-09
RWST
Fixed Wirewound High Power Vitreous Resistors
Electrical Traction Model
PACKAGING
Box: Fixed quantity depending on size and connections.
Vishay Sfernice
MARKING
SFERNICE trademark, model, style, nominal resistance
(in
Ω),
tolerance (in %), manufacturing date.
ORDERING INFORMATION
RWST
MODEL
25 × 138
STYLE
NON-INDUCTIVE
WINDING
Optional
SPECIAL
DESIGN
Optional
B
CONNECTIONS
56U
OHMIC VALUE
Custom items are
subject to extra-charge
and min. order.
Please see price list.
±5
%
B06
e
LEAD
(Pb)-FREE
TOLERANCE PACKAGING
GLOBAL PART NUMBER INFORMATION
R
W
S
T
2
5
1
6
8
C
4
7
0
0
J
B
0
4
GLOBAL
MODEL
RWST
SIZE
25138
25168
30250
40370
50373
LEADS
A
= AN
B
=B
C
= CS
F
= Faston
OPTION
N
= Non
inductive
winding
OHMIC VALUE
TOLERANCE
J
= 5.0 %
K
= 10 %
PACKAGING
Box:
BO1
BO2
BO2NA
BO4
BO4NA
BO6
BO6NA
SPECIAL
As applicable.
Example:
BA7
The first three digits are
significant figures and
the last digit specifies
the number of zeros to
follow. R designates
decimal point.
4700
= 470
Ω
48R8
= 48.7
Ω
R010
= 0.01
Ω
R470
= 0.47
Ω
Document Number: 50017
Revision: 12-May-09
For technical questions, contact:
sfer@vishay.com
www.vishay.com
64
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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