RSSD
Vishay Sfernice
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10
Ω
available)
FEATURES
•
•
•
•
•
•
•
High power rating: 16 W to 600 W at 25 °C
Heavy overloads 10 Pn 15 s
≤
1 %
Low ohmic values 0.10
Ω
available
High long term stability drift < 1.5 % after 1000 h
Excellent withstanding of thermal shock
Mechanical strength
Fire proof
RoHS
COMPLIANT
CS collars
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
¯C
Type 2
Screwed
¯C
DIMENSIONS
in millimeters
RSSD STYLE
Connection
13 × 70 16 × 94 20 × 117
AN
AN
AN
AN
AN
type 1
type 1
type 1
type 1
type 1
CS*
34
50
70
94
117
10
11.5
14.5
18
22
4.1
5
6.7
9.2
12.6
27 ± 2
40 ± 2
56 ± 2
78 ± 2
98 ± 2
20 ± 05 22 ± 0.5 24 ± 0.5 26.5 ± 0.5 31 ± 0.7
6.35
38 ± 1
4.2
21 ± 0.5
4
55
6.35
42 ± 1
4.2
24 ± 0.7
5
80
8 × 34
10 × 50
¯B
R
P
E
P
D
¯Q
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 1
A
¯C
A±2
Ø B max.
Ø C min.
D
E
F
+ 0.5
5
6.35
6.35
+0
P
28 ± 1
31 ± 1
34 ± 1
ØQ
3.2
4.2
4.2
R
16 ± 0.5 18 ± 0.5 20 ± 0.5
Z approx.
1
1.5
3.5
Average unit AN
10
22
38
weight in g
* CS connections on request
J
K
¯B
26
G
H
15
L
M
DIMENSIONS
in millimeters
RSSD STYLE
Connection
25 × 138 25 × 168 30 × 250 40 × 370 50 × 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
138
168
250
370
373
27
27
32
43
53
16.4
16.4
21.3
22.3
27.1
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
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 2
A
¯C
23
¯B
G
H
58
J
K
M
15
L
A±2
Ø B max.
Ø C min.
D
E
F
+ 0.5
9
9
13
18
18
+0
G
-4
199
229
317
432
432
-0
H
-4
169
199
287
405
405
-0
J
50 ± 1.5 50 ± 1.5 60 ± 1.5 69 max. 80 max.
K
27 ± 1
27 ± 1
30 ± 1
45 ± 1 51 ± 1.5
L ± 0.5
6.5
6.5
9
9
9
M ± 0.5
24
24
25
30
30
P
51 ± 1.5 51 ± 1.5 55 ± 1.5 81.5 max. 92.5 max.
ØQ
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
Z approx.
6
6
5
10
11.5
Average unit AN
90
115
240
845
1270
weight in g CS
135
160
290
925
1350
Document Number: 50020
Revision: 25-Jul-07
www.vishay.com
70
For technical questions, contact: sfer@vishay.com
RSSD
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10
Ω
available)
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Average Unit Weight
Vishay Sfernice Special cement
nickel alloy wire
AN collars
CS supporting collars
10 to 1350 g
Vishay Sfernice
ELECTRICAL SPECIFICATIONS
Resistance Range
Standard Resistance
Tolerance
0.12
Ω
to 560
Ω
(E12 series)
R
≥
10
Ω
± 5 %
1
Ω ≤
R
≤
10
Ω
± 10 %
0R1
≤
R < 1
Ω
± 20 %
14 W to 600 W at 25 °C
+ 75 ppm/°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%
1%
1%
1.5 %
Short Time Overload
Climatic Sequence
Thermal Shock
Load Life
10 Pr during 5 s
- 55 °C + 200 °C
5 cycles
Load at 100 % Pr
followed by cold - 55 °C/15
90/30 cycle
1000 h at Pr at + 25 °C
2%
3%
2%
or 0.05
Ω
5%
SPECIAL FEATURES
RSSD TYPE
Power Rating
at 25 °C
Continuous
Reduced
8 × 34
16 W
14 W
0.12
Ω
10
Ω
0
23
10 × 50
25 W
22 W
0.12
Ω
22
Ω
1
21
13 × 70
42 W
38 W
0.12
Ω
43
Ω
1
14
16 × 94
70 W
62 W
0.33
Ω
75
Ω
1
11
20 × 117 25 × 138 25 × 168 30 × 250 40 × 370 50 × 373
100 W
90 W
0.22
Ω
100
Ω
1
10
140 W
125 W
0.10
Ω
150
Ω
1
8
200 W
170 W
0.12
Ω
220
Ω
2
6.5
280 W
240 W
0.22
Ω
360
Ω
2
6
450 W
360 W
0.47
Ω
470
Ω
4
5.7
600 W
450 W
0.68
Ω
560
Ω
4
5.7
Resistance Ohmic Range
(E12, E24 Series)
with 1 Tapping
Maximum Number
of Additional
Tapping
Reduction % of Ohmic
Value by Tapping
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
For technical questions, contact: sfer@vishay.com
www.vishay.com
71
Document Number: 50020
Revision: 25-Jul-07
RSSD
Vishay Sfernice
POWER RATING CHART
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10
Ω
available)
100
% RATED POWER
80
60
40
0
0
100
200
300
400
450
AMBIENT TEMPERA TURE IN °C
TEMPERATURE RISE
x3
4
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
RS
100
RATED POWER IN W
1000
400
HOT SPOT TEMPERATURE IN °C
300
200
100
0
MARKING
SFERNICE trademark, model, style, nominal resistance (in
Ω),
tolerance (in %), manufacturing date.
ORDERING INFORMATION
RSSD
MODEL
10 × 50
STYLE
SPECIAL
DESIGN
Method N°
Optional
AN
CONNECTIONS
Custom items are subject to
extra charge and min. order.
Please see price list.
10U
5%
TOLERANCE
BA25
PACKAGING
e
LEAD
(Pb)-FREE
SAP PART NUMBERING GUIDELINES
RSSD
MODEL
10 × 50
STYLE
A
CONNECTIONS
10R0
OHMIC VALUE
J
TOLERANCE
S06
PACKAGING
www.vishay.com
72
For technical questions, contact: sfer@vishay.com
RS
S
D
8
10
Document Number: 50020
Revision: 25-Jul-07
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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