RW
Vishay Sfernice
Fixed Wirewound High Power Vitreous Resistors
with Terminal Collars or Bands
FEATURES
•
10 W to 80 W at 25 °C
•
•
•
•
•
•
•
•
NF C 93-214
RB 13 x 70 RB 20 x 117
High power up to 80 W at 25 °C
High long term stability drift < 2.5 % after 5000 h
Great mechanical strength
Fire proof
Environmental performance
Thermal shock strength 0.5 % (100 % h at - 25 °C)
The RW wirewound power resistors are extremely well suited to professional applications, where high power and excellent
endurance are required. They meet all requirements of NF C 93-214 specifications and five sizes cover the power range from
10 W to 80 W. Non inductive types are available, by using the special RWNI winding. For higher power or extremely severe
conditions of use, see the RWST series.
DIMENSIONS
in millimeters
RW STYLE
8 × 34
Collar
CONNECTIONS
Collar
Collar
Band
G
F
A
10 × 50
AN
CR
-
B
50
13
5
8
11 ± 0.5
21
14 ± 0.5
31 ± 1.0
18 ± 0.5
6.35
1.5
40
19.5
19.5
72
62
12
4.2
13 × 70
AN
CR
CS
B
70
16
5
10.5
16 × 94
AN
-
-
B
94
19.5
9
12
20 × 117
AN
-
-
B
117
23
9
14
WELDED STAINLESS STEEL 304 L BAND “B”
D
ØC
ØB
E
AN
-
-
-
34
11.5
4.1
-
-
-
-
28 ± 1.0
16 ± 0.5
A±2
Ø B max.
Ø C min.
D
+ 0.5
+0
WELDED STAINLESS STEEL 304 L COLLARS “AN”
N
E
F max.
G
14 ± 0.5 17.5 ± 0.5 21 ± 0.7
24.5
16 ± 0.5
34 ± 1.0
24 ± 0.5
20 ± 0.5
0.6
3.5
56
22.5
20.5
91
81
15
4.2
28
18 ± 0.5
38 ± 1.0
25 ± 0.5
21 ± 0.5
0.6
4
78
-
-
-
-
-
4.2
33
21 ± 0.7
42 ± 1.5
28 ± 0.7
24 ± 0.7
0.8
6
98
-
-
-
-
-
4.2
ØU
ØB
K J
H
ØC
H
J
K
L
M ± 1.5
+ 0.5
+0
19.5 ± 0.5 22 ± 0.5
5
1
27
-
-
-
-
-
3.2
M
L
A
N±2
P±1
Q ± 0.5
R±2
S±2
T
ØU
WELDED STAINLESS STEEL 304 L COLLARS “CR”
N
ØB
ØC
P
Q
R
4.2
Q
WELDED STAINLESS STEEL 304L COLLARS “CS”
4.2
T
S
www.vishay.com
58
For technical questions, contact: sfer@vishay.com
Document Number: 50016
Revision: 16-Oct-08
RW
Fixed Wirewound High Power Vitreous Resistors
with Terminal Collars or Bands
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Average Unit Weight
Enamel
Ni-Cr wire
B band
AN - CR - CS collars
10 to 100 g
Vishay Sfernice
ELECTRICAL SPECIFICATIONS
Resistance Range
Resistance Tolerances
Standard
Power Rating
Temperature Coefficient
Dielectric Strength
Insulation Resistance
Shelf Life
1
Ω
to 68 kΩ
(E12 peferred series value)
±5%
10 W to 80 W at 25 °C
75 ppm/°C (typical)
1000 V
RMS
(AN collars)
100 MΩ (500 V
DC
)
AN collars
0.1 % year (typical)
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
Load Life
CONDITIONS
10 Pr during 5 seconds
Voltage limited at < 5000 V
current limited at 5 A
- 55 °C
5 cycles
56 days
95 % relative humidity
Load at 100 % Pr followed by cold
temp. exposure at - 55 °C
severity 50
9 shocks/each side
severity 55B
Collar AN Traction 40 N
Band B Torque 60 Ncm
90'/30' cycle
1000 hours at Pr 25 °C
+ 200 °C
REQUIREMENTS
2 % or 0.05
Ω
3 % or 0.05
Ω
Insulation resistance > 100 MΩ
2 % 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%
1000 h
5000 h
TYPICAL VALUES AND DRIFTS
0.5 %
0.5 %
0.5 %
0.5 %
0.25 %
0.25 %
0.5 %
1.5 %
2.5 %
SPECIAL FEATURES
RW 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
1
Ω
8 x 34
-
10 W
13 W
10 kΩ
300 V
6.9 kΩ
1
Ω
10 x 50
-
17 W
20 W
27 kΩ
450 V
10 kΩ
13 x 70
RB 13 x 70
28 W
32 W
2.2
Ω
56 kΩ
16 x 94
-
44 W
50 W
2.2
Ω
56 kΩ
20 x 117
RB 20 x 117
72 W
80 W
2.7
Ω
68 kΩ
650 V
13.2 kΩ
900 V
16 kΩ
1100 V
15.1 kΩ
NON INDUCTIVE WINDING
For high frequencies, low self induction resistors are available with special windings.
RWNI designation.
MODEL
AND STYLE
Ohmic range
RWNI
8 x 34
4.7
Ω
100
Ω
RWNI
10 x 50
4.7
Ω
220
Ω
RWNI
13 x 70
4.7
Ω
620
Ω
RWNI
16 x 94
10
Ω
1.2 kΩ
RWNI
20 x 117
10
Ω
2.2 kΩ
Document Number: 50016
Revision: 16-Oct-08
For technical questions, contact: sfer@vishay.com
www.vishay.com
59
RW
Vishay Sfernice
Fixed Wirewound High Power Vitreous Resistors
with Terminal Collars or Bands
POWER RATING CHART
100
% RATED POWER
75
50
VISHAY
SFERNICE
25
NF C 93-214
0
0
75
150
225
300
375
450
525
AMBIENT TEMPERATURE IN °C
TEMPERATURE RISE
50
RW
13 x
70
RW
16 x
94
RW
20
x1
17
34
RW 8
x
400
HOT SPOT TEMPERATURE IN °C
300
200
100
0
10
RATED POWER IN W
100
1000
MARKING
SFERNICE trademark, model, style, NF style (if applicable) nominal resistance (in
Ω
), tolerance (in %), manufacturing date.
ORDERING INFORMATION
RW
MODEL
20 × 117
STYLE
NI
NON-INDUCTIVE
WINDING
Optional
SPECIAL
DESIGN
Optional
AN
CONNECTIONS
68
Ω
OHMIC VALUE
Custom items are
subject to extra-charge
and min. order.
Please see price list.
±5%
B020
e
LEAD
(Pb)-FREE
RW
10 x
TOLERANCE PACKAGING
SAP PART NUMBERING GUIDELINES
RW
MODEL
20117
STYLE
A
CONNECTIONS
680
OHMIC VALUE
J
TOLERANCE
B15
PACKAGING
www.vishay.com
60
For technical questions, contact: sfer@vishay.com
Document Number: 50016
Revision: 16-Oct-08
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
www.vishay.com
1
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