RSSD
Vishay Sfernice
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values
FEATURES
• 16W to 600W at 25°C
• High power rating
• Heavy overloads
• Low ohmic values
• Great endurance
• Excellent withstanding of thermal shock
CS collars
• Mechanical strength
• Fire proof
RSSD medium and high power resistors are noted for their ability to withstand heavy transient and severe shock
and vibration conditions. They complement the ohmic range of Vishay styles RW, RWST and RA in the low value
area, and can be tapped by means of adjustable collars. Standard RSSD resistors have a single adjustable collar.
DIMENSIONS
WELDED STAINLESS STEEL 304 L COLLARS “AN” TYPE 1
A
Z
F
F
Type 1
Solded
ØC
Type 2
Screwed
ØC
DIMENSIONS
in millimeters
RSSD STYLE
Connection
8 x 34
AN
type 1
10 x 50
AN
type 1
13 x 70 16 x 94 20 x 117
AN
AN
AN
type 1
type 1
type 1
CS*
117
94
70
22
18
14.5
12.6
9.2
6.7
98 ± 2
78 ± 2
56 ± 2
24 ± 0.5 26.5 ± 0.5 31 ± 0.7
6.35
6.35
6.35
42 ± 1
38 ± 1
34 ± 1
4.2
4.2
4.2
24 ± 0.7
20 ± 0.5 21 ± 0.5
5
4
3.5
80
55
38
ØB
R
P
E
P
D
ØQ
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 1
A
ØC
A±2
34
50
Ø B max.
10
11.5
Ø C min.
4.1
5
D
27 ± 2
40 ± 2
E
20 ± 05 22 ± 0.5
+ 0.5
F
+0
5
6.35
P
28 ± 1
31 ± 1
ØQ
3.2
4.2
R
16 ± 0.5 18 ± 0.5
Z approx.
1
1.5
Average unit AN
10
22
weight in g
*CS connections on request
DIMENSIONS
in millimeters
J
K
ØB
26
G
H
15
L
M
RSSD STYLE
Connection
A±2
Ø B max.
Ø C min.
D
E
F + 0.5
+0
ØC
25 x 138 25 x 168 30 x 250 40 x 370 50 x 373
AN
AN
AN
AN
AN
type 1
type 1
type 1
type 2
type 2
CS
CS
CS
CS
CS
type 1
type 1
type 1
type 2
type 2
168
138
250
370
373
27
27
32
43
53
16.4
16.4
21.3
27.1
22.3
117 ± 2 147 ± 2 227 ± 2.5 332 ± 3 332 ± 3
33.5 ± 1 33.5 ± 1 36 ± 1
57 ± 1.5 63 ± 1.5
9
199
169
50 ± 1.5
27 ± 1
6.5
24
51 ± 1.5
5.7
28.5 ± 1
6
90
135
9
229
13
317
18
432
18
432
405
80 max.
51 ± 1.5
9
30
92.5 max.
9.2
51 ± 1.5
11.5
1270
1350
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 2
A
23
ØB
G
H
58
J
K
M
15
L
G –4
–0
H –4
–0
J
K
L ± 0.5
M ± 0.5
P
ØQ
R
Z approx.
Average AN
unit
weight in g CS
199
287
405
50 ± 1.5 60 ± 1.5 69 max.
27 ± 1
30 ± 1
45 ± 1
6.5
9
9
24
25
30
51 ± 1.5 55 ± 1.5 81.5 max.
5.7
5.7
9.2
28.5 ± 1 31 ± 1
45 ± 1.5
6
5
10
115
240
845
160
290
925
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70
For technical questions, contact sfer@vishay.com
Document Number: 50020
Revision 27-Jun-02
RSSD
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Average Unit Weight
Vishay Sfernice Special cement
nickel alloy wire
AN collars
CS supporting collars
10 to 1350g
Vishay Sfernice
ELECTRICAL SPECIFICATIONS
Resistance Range
0.12Ω to 560Ω
(E12-E24 series)
Standard Resistance
Tolerance
R
≥
10Ω ± 5%
1Ω
≤
R < 10Ω ± 10%
R < 1Ω ± 20%
14W to 600W at 25°C
+ 75ppm/°C (typical)
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits
Climatic Category
– 55°C + 450°C
– 55°C/+ 200°C/56 days
Power Rating
Temperature Coefficient
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
TYPICAL
VALUES
AND DRIFTS
1%
Short Time Overload
Climatic Sequence
Thermal Shock
10Pr during 5s
– 55°C + 200°C
5 cycles
Load at 100% Pr
followed by cold – 55°C/15’
90’/30’ cycle
1000h at Pr at + 25°C
2%
3%
2%
or 0.05Ω
5%
1%
1%
Load Life
1.5%
SPECIAL FEATURES
RSSD TYPE
Power Rating
at 25°C
Continuous
Reduced
8 x 34
16W
14W
0.12Ω
10Ω
0
10 x 50
25W
22W
0.12Ω
22Ω
1
13 x 70
42W
38W
0.12Ω
43Ω
1
16 x 94
70W
62W
0.33Ω
75Ω
1
20 x 117 25 x 138
100W
90W
0.22Ω
100Ω
1
140W
125W
0.10Ω
150Ω
1
25 x 168 30 x 250
200W
170W
0.12Ω
220Ω
2
280W
240W
0.22Ω
360Ω
2
40 x 370 50 x 373
450W
360W
0.47Ω
470Ω
4
600W
450W
0.68Ω
560Ω
4
Resistance Ohmic
Range (E12, E24 Series)
with 1 Tapping
Maximum Number
of Additional
Tapping
Reduction % of Ohmic
Value by Tapping
23
21
14
11
10
8
6.5
6
5.7
5.7
ADDITIONAL TAPPINGS
Are supplied with their adjustable collars fastened but not set to any specific value. Please note that, on request, all tappings
can be adjusted by VISHAY SFERNICE. For adjustment purposes we would need to be advised of the ohmic values, and
tolerances of the sections in successive order in addition to their sum Rn.
The permissible maximum value for an adjustment should take into account the possible negative tolerance of Rn.
Please consult VISHAY SFERNICE regarding the acceptable tolerance.
RECOMMENDATIONS FOR USE
Maximum Current Strength:
The ohmic value and the power decrease as the connections are brought together. To avoid overload, the maximum current
strength that is permissible for Rn should never be exceeded:
I max. =
Pr/Rn
√
Document Number: 50020
Revision 27-Jun-02
For technical questions, contact sfer@vishay.com
www.vishay.com
71
RSSD
Vishay Sfernice
POWER RATING CHART
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values
100
% RATED POWER
80
60
40
0
0
100
200
300
400
450
AMBIENT TEMPERATURE IN DEGREES CELSIUS
TEMPERATURE RISE
400
HOT SPOT TEMPERATURE IN °C
300
200
100
0
RS
SD
8x
34
RS
SD
10
x5
RS
0
SD
13
x7
RS
0
SD
16
RS
x9
SD
4
20
RS
x1
S
17
RS D 2
SD 5 x
13
8
RS
25 x
SD
16
8
30
x2
RS
50
SD
40
RS
x3
SD
70
50
x3
73
10
100
1000
RATED POWER IN WATTS
MARKING
SFERNICE trademark, model, style, nominal resistance (in
Ω),
tolerance (in %), manufacturing date.
ORDERING INFORMATION
RSSD
10 X 50
AN
20Ω
± 5%
MODEL
STYLE
SPECIAL DESIGN
Method N°
Optional
CONNECTIONS
Custom items are subject to
extra charge and min. order.
Please see price list.
TOLERANCE
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72
For technical questions, contact sfer@vishay.com
Document Number: 50020
Revision 27-Jun-02
Legal Disclaimer Notice
Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000
Revision: 08-Apr-05
www.vishay.com
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