Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available)
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50020
70 Revision: 25-Jul-07
RSSD
Vishay Sfernice
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
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
* CS connections on request
CS collars
RoHS
COMPLIANT
WELDED STAINLESS STEEL 304 L COLLARS “AN” TYPE 1
Ty p e 2
Screwed
Ty p e 1
Solded
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 1
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 2
A
ZF
¯ B
D¯ Q
R
¯ C ¯ C
P
E
P
A
¯ B
26
¯ C
J
K
M
G
H
L
A
¯ B
23
58
J
K
¯ C
M
G
H
15
15
L
F
DIMENSIONS in millimeters
RSSD STYLE 8 × 34 10 × 50 13 × 70 16 × 94 20 × 117
Connection AN
type 1 AN
type 1
AN
type 1
CS*
AN
type 1 AN
type 1
A ± 2 34 50 70 94 117
Ø B max. 10 11.5 14.5 18 22
Ø C min. 4.1 5 6.7 9.2 12.6
D 27 ± 2 40 ± 2 56 ± 2 78 ± 2 98 ± 2
E 20 ± 05 22 ± 0.5 24 ± 0.5 26.5 ± 0.5 31 ± 0.7
F+ 0.5
+ 0 5 6.35 6.35 6.35 6.35
P 28 ± 1 31 ± 1 34 ± 1 38 ± 1 42 ± 1
Ø Q 3.2 4.2 4.2 4.2 4.2
R 16 ± 0.5 18 ± 0.5 20 ± 0.5 21 ± 0.5 24 ± 0.7
Z approx. 1 1.5 3.5 4 5
Average unit AN
weight in g 10 22 38 55 80
DIMENSIONS in millimeters
RSSD STYLE 25 × 138 25 × 168 30 × 250 40 × 370 50 × 373
Connection
AN
type 1 AN
type 1 AN
type 1 AN
type 2 AN
type 2
CS
type 1 CS
type 1 CS
type 1 CS
type 2 CS
type 2
A ± 2 138 168 250 370 373
Ø B max. 27 27 32 43 53
Ø C min. 16.4 16.4 21.3 22.3 27.1
D 117 ± 2 147 ± 2 227 ± 2.5 332 ± 3 332 ± 3
E 33.5 ± 1 33.5 ± 1 36 ± 1 57 ± 1.5 63 ± 1.5
F + 0.5
+ 0 9 9 13 18 18
G- 4
- 0 199 229 317 432 432
H- 4
- 0 169 199 287 405 405
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 2424253030
P 51 ± 1.5 51 ± 1.5 55 ± 1.5 81.5 max. 92.5 max.
Ø 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
Z approx. 6 6 5 10 11.5
Average unit
weight in g
AN 90 115 240 845 1270
CS 135 160 290 925 1350
RSSD
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available) Vishay Sfernice
Document Number: 50020 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 25-Jul-07 71
MECHANICAL SPECIFICATIONS
Mechanical Protection
Vishay Sfernice Special cement
Resistive Element nickel alloy wire
Connections AN collars
CS supporting collars
Average Unit Weight 10 to 1350 g
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits - 55 °C + 450 °C
Climatic Category - 55 °C/+ 200 °C/56 days
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:
Imax =
ELECTRICAL SPECIFICATIONS
Resistance Range 0.12 Ω to 560 Ω
(E12 series)
Standard Resistance R ≥ 10 Ω ± 5 %
Tolerance 1 Ω ≤ R ≤ 10 Ω ± 10 %
0R1 ≤ R < 1 Ω ± 20 %
Power Rating 14 W to 600 W at 25 °C
Temperature Coefficient + 75 ppm/°C (typical)
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
TYPICAL
VALUES
AND DRIFTS
Short Time Overload 10 Pr during 5 s 2 % 1 %
Climatic Sequence - 55 °C + 200 °C
5 cycles 3 % 1 %
Thermal Shock Load at 100 % Pr
followed by cold - 55 °C/15
2 %
or 0.05 Ω1 %
Load Life 90/30 cycle
1000 h at Pr at + 25 °C 5 % 1.5 %
SPECIAL FEATURES
RSSD TYPE 8 × 34 10 × 50 13 × 70 16 × 94 20 × 117 25 × 138 25 × 168 30 × 250 40 × 370 50 × 373
Power Rating
at 25 °C
Continuous 16 W 25 W 42 W 70 W 100 W 140 W 200 W 280 W 450 W 600 W
Reduced 14 W 22 W 38 W 62 W 90 W 125 W 170 W 240 W 360 W 450 W
Resistance Ohmic Range
(E12, E24 Series)
with 1 Tapping
0.12 Ω
10 Ω
0.12 Ω
22 Ω
0.12 Ω
43 Ω
0.33 Ω
75 Ω
0.22 Ω
100 Ω
0.10 Ω
150 Ω
0.12 Ω
220 Ω
0.22 Ω
360 Ω
0.47 Ω
470 Ω
0.68 Ω
560 Ω
Maximum Number
of Additional
Tapping
0 1 1 1 1 1 2 2 4 4
Reduction % of Ohmic
Value by Tapping 23 21 14 11 10 8 6.5 6 5.7 5.7
Pr/Rn
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50020
72 Revision: 25-Jul-07
RSSD
Vishay Sfernice Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available)
POWER RATING CHART
TEMPERATURE RISE
MARKING
SFERNICE trademark, model, style, nominal resistance (in Ω), tolerance (in %), manufacturing date.
ORDERING INFORMATION
RSSD 10 × 50 AN 10U 5 % BA25 e
MODEL STYLE SPECIAL
DESIGN
Method N°
Optional
CONNECTIONS
Custom items are subject to
extra charge and min. order.
Please see price list.
TOLERANCE PACKAGING LEAD
(Pb)-FREE
SAP PART NUMBERING GUIDELINES
RSSD 10 × 50 A 10R0 J S06
MODEL STYLE CONNECTIONS OHMIC VALUE TOLERANCE PACKAGING
AMBIENT TEMPERA T URE IN °C
% RA TED POWER
100
8 0
6 0
4 0
0 0 100 200 300 400 450
RATED POWER IN W
C
°
N
I
E R U T
A
R E P M
E T T
O P
S
T O H
400
300
200
100
0 10 100 1000
R
S
S
D 8 x 3
4
R
S
S
D 1
0 x 5
0
x
3 1
D S S
R 0 7
R
S
S
D 1
6 x 9
4
R
S
S D 2
0 x 1
1
7
R
S
S
D 2
5 x 1
3
8
R
S
S
D 2
5 x 1
6
8
R
S
S
D 3
0 x 2
5
0
R
S
S
D 4
0 x 3
7
0
R
S
S
D 5
0 x 3
7 3
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
Disclaimer
Legal Disclaimer Notice
Vishay
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.
