RW
Vishay Sfernice
Fixed Wirewound High Power Vitreous Resistors
with Terminal Collars or Bands
FEATURES
•
•
•
•
•
•
•
•
•
10 Watt to 80 Watt at 25°C
NF C 93-214
RB 13 x 70 RB 20 x 117
High power
Outstanding endurance
Great mechanical strength
Fire proof
Environmental performance
Thermal shock strength
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 10W to 80W. 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
WELDED STAINLESS STEEL 304 L BAND “B”
D
øC
øB
E
G
F
A
RW STYLE
Collar
Collar
Connections Collar
Band
A±2
Ø B max.
Ø C min.
+ 0.5
+0
8 x 34
AN
–
–
–
34
11.5
4.1
–
–
–
–
28 ± 1
19.5 ± 0.5
16 ± 0.5
5
1
27
–
–
–
–
–
3.2
10 x 50
AN
CR
–
B
50
13
5
8
11 ± 0.5
21
14 ± 0.5
31 ± 1
22 ± 0.5
18 ± 0.5
13 x 70
AN
CR
CS
B
70
16
5
10.5
14 ± 0.5
24.5
16 ± 0.5
34 ± 1
24 ± 0.5
20 ± 0.5
6.35
16 x 94 20 x 117
AN
AN
–
–
–
–
B
B
94
117
19.5
23
9
9
12
17.5 ± 0.5
28
18 ± 0.5
38 ± 1
25 ± 0.5
21 ± 0.5
14
21 ± 0.7
33
21 ± 0.7
42 ± 1.5
28 ± 0.7
24 ± 0.7
WELDED STAINLESS STEEL 304 L COLLARS “AN”
N
D
E
F max.
ØU
ØB
K
J
H
G
H
J
K
L
+ 0.5
+0
ØC
M ± 1.5
M
L
A
N±2
P±1
Q ± 0.5
R±2
S±2
ØB
WELDED STAINLESS STEEL 304 L COLLARS “CR”
N
T
ØU
ØC
P
1.5
40
19.5
19.5
72
62
12
4.2
3.5
56
22.5
20.5
91
81
15
4.2
4
78
–
–
–
–
–
4.2
6
98
–
–
–
–
–
4.2
WELDED STAINLESS STEEL 304 L COLLARS “CS”
Q
R
Q
4.2
T
4.2
S
www.vishay.com
58
For technical questions, contact sfer@vishay.com
Document Number: 50016
Revision 14-Jun-02
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 100g
Resistance Tolerances
Standard
Power Rating
Temperature Coefficient
Dielectric Strength
Insulation Resistance
Shelf Life
± 5%
10W to 80W at 25°C
75ppm/°C (typical)
1000VRMS (AN collars)
100MΩ (500VDC)
AN collars
0.1% year (typical)
Resistance Range
Vishay Sfernice
ELECTRICAL SPECIFICATIONS
1Ω to 68kΩ
(E12-E24 peferred series value)
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits
Climatic Category
– 55°C + 450°C
– 55°C/+ 200°C/56 days
PERFORMANCE
TESTS
Short Time Overload
CONDITIONS
10Pr during 5s
Voltage limited at < 5000V
current limited at 5A
– 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 40N
Band B Torque 60Ncm
90’/30’ cycle
1000h at Pr 25°C
+ 200°C
REQUIREMENTS
2% or 0.05Ω
3% or 0.05Ω
Insulation resistance > 100MΩ
2% or 0.05Ω
Insulation resistance > 100MΩ
2% or 0.05Ω
1% or 0.05Ω
1% or 0.05Ω
1% or 0.05Ω
5%
1000h
5000h
TYPICAL VALUES AND DRIFTS
0.5%
Climatic sequence
Humidity
(Steady State)
Thermal Shock
Shock
Vibration
0.5%
0.5%
0.5%
0.25%
0.25%
0.5%
1.5%
2.5%
Terminal Strength
Load Life
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
1Ω
8 x 34
–
10W
13W
10kΩ
300V
6.9kΩ
1Ω
10 x 50
–
17W
20W
27kΩ
450V
10kΩ
2.2Ω
13 x 70
RB 13 x 70
28W
32W
56kΩ
650V
13.2kΩ
2.2Ω
16 x 94
–
44W
50W
56kΩ
900V
16kΩ
2.7Ω
20 x 117
RB 20 x 117
72W
80W
68kΩ
1100V
15.1kΩ
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
4.7Ω
100Ω
RWNI
10 x 50
4.7Ω
220Ω
RWNI
13 x 70
4.7Ω
620Ω
RWNI
16 x 94
10Ω
1.2kΩ
RWNI
20 x 117
10Ω
2.2kΩ
Document Number: 50016
Revision 14-Jun-02
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 DEGREES CELSIUS
TEMPERATURE RISE
x 34
RW
8
HOT SPOT TEMPERATURE IN °C
300
200
100
0
10
100
RATED POWER IN WATTS
1000
MARKING
SFERNICE trademark, model, style, NF style (if applicable) nominal resistance (in
Ω),
tolerance (in %), manufacturing date.
ORDERING INFORMATION
RW
MODEL
20 x 117
STYLE
NI
NON-INDUCTIVE
BOBINAGE
Optional
SPECIAL
DESIGN
Optional
AN
CONNECTIONS
68Ω
OHMIC VALUE
± 5%
TOLERANCE
RW
1
400
0x
50
RW
13 x
70
RW
16 x
94
RW
20
x1
17
Custom items are subject
to extra-charge and min. order.
Please see price list.
www.vishay.com
60
For technical questions, contact sfer@vishay.com
Document Number: 50016
Revision 14-Jun-02
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