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RSO
Vishay Sfernice
Fixed Wirewound Enamelled Corrugated Tape Resistors
Very High Dissipation
FEATURES
• 160 Watt to 1 kW at 25 °C
AN Collars
CS Collars
The remarkable dissipation power of this series is the result of an original winding method using corrugated edge-wound tape,
thus forming a very active radiator. The enamelling follows the contour of the resistive element and provides effective insulation
and support for the winding.
The tubular core is of special ceramic, capable of withstanding high thermal shock and overload of short duration.
DIMENSIONS
SCREWED STAINLESS STEEL 304 L “AN” TYPE 1
Z
F
ØC
SCREWED STAINLESS STEEL 304 L “CS” TYPE 1
26
SCREWED STAINLESS STEEL 304 L “CS” TYPE 2
23
3
DIMENSIONS in millimeters
A
ØC
E
ØB
P
A
G
H
A
ØB
G
H
R
ØQ
J
ØB
15
L
58
15
L
D
ØC
K
M
ØC
J
K
M
RSO STYLE 25 x 138 25 x 168 30 x 250 40 x 370 50 x 373
AN
Connections
type 1ANtype 1ANtype 1ANtype 2ANtype 2
CS
type 1CStype 1CStype 1CStype 2CStype 2
A ± 2 138 168 250 370 373
Ø B max. 39 39 44 54.5 65
Ø C min. 12.6 12.6 17.4 22.3 27.1
D max. 54 54 62 85.8 97
E 33.5 ± 1 33.5 ± 1 36 ± 1 57 ± 1.5 63 ± 1.5
F + 0.5
+ 0
9 9 13 18 18
Z 6 6 5 10 11.5
G - 4
- 0
H - 4
- 0
199 229 317 432 432
169 199 287 405 405
J 50 ± 1.5 50 ± 1.5 60 ± 1.5 73.8 79
K 27 ± 1 27 ± 1 30 ± 1 45 ± 1.5 45 ± 1.5
L ± 0.5 6.5 6.5 9 9 9
M ± 0.52424253030
P 117 ± 2 147 ± 2 227 ± 2.5 332 ± 3 332 ± 3
Q 5.7 5.7 5.7 9.2 9.2
R 28.5 ± 1 28.5 ± 1 31 ± 1 45 ± 1.5 51 ± 1.5
Average
weight
AN 160 190 350 960 1375
in g
CS 205 235 400 1040 1455
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50018
64 Revision: 18-Dec-06
RSO
Fixed Wirewound Enamelled Corrugated Tape Resistors
Vishay Sfernice
Very High Dissipation
MECHANICAL SPECIFICATIONS
Mechanical Protection enamel
Resistive Element Ni-Cr wire
Connections
AN CS supporting collars
Average Unit Weight 160 to 1455 g
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits - 55 °C + 450 °C
Climatic Category
- 55 °C/+ 200 °C/56 days
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS TYPICAL VALUES AND DRIFTS
Short Time Overload 10 Pr during 5 s 2 % or 0.05 Ω 1 %
Thermal Shock
Climatic Sequence
Load Life
temp. exposure at - 55 °C/15 sec
Load at Pr
followed by cold
Phase A: + 200°
Phase C: - 55°
Phase D: 5 cycles
90/30' cycle
1000 h at Pr 25 °C
ELECTRICAL SPECIFICATIONS
Resistance Range
Standard Resistance Tolerance
Power Rating 160 W to 1 kW at 25 °C
Temperature Coefficient 180 ppm/°C Typical
2 % or 0.05 Ω 1 %
3 % or 0.05 Ω 1 %
5 % 2 %
0.068 Ω to 68 MΩ
(E12 preferred series)
Rn ≥ 1 Ω ± 5 %
Rn < 1 Ω ± 10 %
SPECIAL FEATURES
RSO STYLE 25 x 138 25 x 168 30 x 250 40 x 370 50 x 373
Power Rating at 25 °C 160 W 200 W 350 W 700 W 1000 W
Resistance Ohmic Range
(E12 Series)
0.068 Ω
12 Ω
0.10 Ω
18 Ω
0.22 Ω
33 Ω
0.33 Ω
56 Ω
0.39 Ω
68 Ω
RECOMMENDATIONS FOR USE
OVERLOAD:
The RSO resistors are capable of withstanding overloads of about 10 Pr for a maximum period of 5 seconds; they can resist
momentarily even greater overloads.
Particular requirements should be submitted to Vishay Sfernice.
Document Number: 50018 For technical questions, contact: sfer@vishay.com
Revision: 18-Dec-06 65
www.vishay.com
RSO
Vishay Sfernice
POWER RATING CHART
TEMPERATURE RISE
Fixed Wirewound Enamelled Corrugated Tape Resistors
Very High Dissipation
100
REWOP DETAR %
75
50
25
0
0 100 200 300 400 450
AMBIENT TEMPERATURE IN DEGREES CELSIUS
450
400
C° NI
ERUTA
300
R
EP
ME
200
T
T
O
PS
T
O
100
H
831 x 52
861
05
x 52 OS
2 x
0
73
03 OSR
OS
R
R
3
x
73
0
x
4
OS
05 OSR
R
0
1 0 1 0 0 1 0 0 0
RATED POWER IN WATTS
PACKING
Box: fixed qualtity depending on size and collars
MARKING
SFERNICE trademark, model, style, nominal resistance (in Ω), tolerance (in %), manufacturing date.
ORDERING INFORMATION
RSO 25 x 168 XXX CS U82 ± 10 % B02NA e
MODEL STYLE SPECIAL
CONNECTIONS OHMIC VALUE
TOLERANCE PACKING LEAD
DESIGN
Method N°
Optional
Custom items are
subject to
extra-charge and
min. order.
Please see price list.
SAP PART NUMBERING GUIDELINES
RSO 25168 C R820 K N
MODEL STYLE CONNECTIONS OHMIC VALUE TOLERANCE PACKING
(Pb)-FREE
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50018
66 Revision: 18-Dec-06
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