RWST
www.vishay.com
Vishay Sfernice
Wirewound Resistors, Industrial High Power, Vitreous Tubular
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
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
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
Revision: 14-Oct-16
Document Number: 50017
1
For technical questions, contact:
sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
RWST
www.vishay.com
Vishay Sfernice
G
-4
+0
199
229
317
432
432
ØU
5.7
5.7
5.7
9.2
9.2
H
-4
+0
169
199
287
405
405
V
33.5 ± 1
33.5 ± 1
36 ± 1
57 ± 1.5
63 ± 1.5
L
+ 0.5
+0
9
9
13
18
18
DIMENSIONS
in millimeters
SERIES
RWST
25 x 138
RWST
25 x 168
RWST
30 x 250
RWST
40 x 370
RWST
50 x 373
SERIES
RWST
25 x 138
RWST
25 x 168
RWST
30 x 250
RWST
40 x 370
RWST
50 x 373
CONNECTIONS
AN-B CS type 1
AN-B CS type 1
AN-B CS type 1
AN CS type 2
AN CS type 2
CONNECTIONS
AN-B CS type 1
AN-B CS type 1
AN-B CS type 1
AN CS type 2
AN CS type 2
A±2
138
168
250
370
373
N±2
ØB
MAX.
28
28
33
45
53
P
ØC
MIN.
12
12
17
22
27.1
Q
-0
+5
15
15
18
-
-
D
50 ± 1.5
50 ± 1.5
60 ± 1.5
69 max.
80 max.
R
- 0.3
+ 0.9
26
26
31
-
-
E
27 ± 1
27 ± 1
30 ± 1
45 ± 1.5
51 ± 1.5
S
MAX.
38.5
38.5
43.5
-
-
F
± 0.5
24
24
25
30
30
T±1
23.5
23.5
26
-
-
J
± 0.5
6.5
6.5
9
9
9
Z
6
6
5
10
11.5
K
28.5 ± 1
28.5 ± 1
31 ± 1
45 ± 1.5
51 ± 1.5
AVERAGE UNIT
WEIGHT IN g
(CS collars)
225
250
445
1400
2200
117 ± 2 51.5 ± 1.5
147 ± 2
227 ± 2
50 ± 1.5
55 ± 1.5
332 ± 3 81.5 max.
332 ± 3 92.5 max.
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
RWST 25 x 138
RWST 25 x 168
RWST 30 x 250
RWST 40 x 370
RWST 50 x 373
SIZE
25138
25168
30250
40370
50373
RESISTANCE
RANGE
2.7 to 82K
2.7 to 100K
4.7 to 220K
8.2 to 360K
12 to 390K
RATED POWER
P
25 °C
W
95
160
280
500
700
TOLERANCE
±%
5
5
5
5
5
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
TECHNICAL SPECIFICATIONS
Resistance Range
Resistance Tolerance
Standard
Power Rating
Temperature Coefficient
Shelf Life
2.7
to 430 k
(E12, E24 preferred series values)
±5%
95 W to 800 W at 25 °C
75 ppm/°C (typical)
0.1 % year (typical)
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
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
Load Life
Revision: 14-Oct-16
AN
B
CONDITIONS
10
P
r
during 5 s
Voltage limited at < 5000 V
-55 °C, +200 °C
56 days
95 % relative humidity
Load at 100 %
P
r
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
P
r
25 °C
REQUIREMENTS
2 % or 0.05
2 % or 0.05
Insulation resistance 100 M
3 % or 0.05
Insulation resistance 100 M
2 % or 0.05
1 % or 0.05
1 % or 0.05
1 % or 0.05
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%
Document Number: 50017
2
For technical questions, contact:
sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
RWST
www.vishay.com
Vishay Sfernice
25 x 168
RB 25 x 168
180 W
2.7
to 100 k
1900 V
20 k
30 x 250
RB 30 x 250
320 W
4.7
to 220 k
3000 V
30 k
40 x 370
-
600 W
8.2
to 360 k
4500 V
36 k
50 x 373
-
800 W
12
to 430 k
5000 V
30 k
SPECIAL FEATURES
RWST STYLE
Designation NF C 93-214
Maximum Power Rating at 25 °C
Ohmic Range (E12, E24 series)
Limiting Element Voltage
Critical Resistance
25 x 138
-
110 W
2.7
to 82 k
1400 V
18 k
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
2.5 k
RWSTNI
25 x 168
22
4 k
RWSTNI
30 x 250
120
6.8 k
RWSTNI
40 x 370
120
8.2 k
RWSTNI
50 x 373
150
8.2 k
POWER RATING
100
TEMPERATURE RISE
HOT SPOT TEMPERATURE IN °C
400
RATED POWER IN %
75
300
50
200
25
100
0
0
10
100
1000
0
65
130
195
260
325
390
455
AMBIENT TEMPERATURE IN °C
RATED POWER IN W
MARKING
Vishay Sfernice trademark, model, style, nominal resistance
(in
), tolerance (in %), manufacturing date.
PACKAGING
Box: Fixed quantity depending on size and connections
ORDERING INFORMATION
RWST
MODEL
25 x 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
TOLERANCE PACKAGING
e
LEAD
(Pb)-FREE
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
25 x 138
25 x 168
30 x 250
40 x 370
50 x 373
LEADS
A
= AN
B
=B
C
= CS
F
= faston
OPTION
N
= non
inductive
winding
OHMIC VALUE
The first three digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal
point.
4700
= 470
48R8
= 48.7
R010
= 0.01
R470
= 0.47
TOLERANCE
J
= 5.0 %
PACKAGING
Box:
BO1
BO2
BO2NA
BO4
BO4NA
BO6
BO6NA
RELATED DOCUMENTS
APPLICATION NOTES
Packaging Information
Revision: 14-Oct-16
www.vishay.com/doc?50033
Document Number: 50017
3
For technical questions, contact:
sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
RW
ST
25
×1
RW
38
ST
25
×1
RW
68
ST
30
×2
RW
50
ST
40
RW
×3
ST
70
50
×3
73
SPECIAL
As applicable.
Example:
BA7
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
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© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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