Document Number: 50020 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 30-Jun-09 121
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available)
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
•Compliant to RoHS directive 2002/95/EC
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.
NF F 16101, 10/1988 and 16102, 04/1992: Not applicable (our parts are made of metallic and refractory materials).
Note
(1) CS connections on request
CS collars
DIMENSIONS in millimeters
RSSD
SERIES CONNECTION A ± 2 Ø B
MAX.
Ø C
MIN. DE
F + 0.5
+ 0 PØ QR Z
APPROX.
AVERAGE
UNIT
WEIGHT IN g
8 x 34 AN type1 34 10 4.1 27 ± 2 20 ± 0.5 5 28 ± 1 3.2 16 ± 0.5 1 10
10 x 50 AN type1 50 11.5 5 40 ± 2 22 ± 0.5 6.35 31 ± 1 4.2 18 ± 0.5 1.5 22
13 x 70 AN type1 70 14.5 6.7 56 ± 2 24 ± 0.5 6.35 34 ± 1 4.2 20 ± 0.5 3.5 38
16 x 94 AN type1 CS (1) 94 18 9.2 78 ± 2 26.5 ± 0.5 6.35 38 ± 1 4.2 21 ± 0.5 4 55
20 x 117 AN type1 117 22 12.6 98 ± 2 31 ± 0.7 6.35 42 ± 1 4.2 24 ± 0.7 5 80
WELDED STAINLESS STEEL 304 L COLLARS “AN” TYPE 1
Type 2
Screwed
Type 1
Solded
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 1
SCREWED STAINLESS STEEL 304 L COLLARS “CS” TYPE 2
A
Z
Ø B
DØ Q
R
Ø C Ø C
P
E
P
A
Ø B
26
Ø C
J
K
M
G
H
L
A
Ø B
23
58
J
K
Ø C
M
G
H
15
15
L
F
F
DIMENSIONS in millimeters
RSSD
SERIES CONNECTIONS A ± 2 Ø B
MAX.
Ø C
MIN. D E F + 0.5
+ 0
G - 4
- 0
H - 4
- 0 J
25 x 138 AN type1 CS type1 138 27 16.4 117 ± 2 33.5 ± 1 9 199 169 50 ± 1.5
25 x 168 AN type1 CS type1 168 27 16.4 147 ± 2 33.5 ± 1 9 229 199 50 ± 1.5
30 x 250 AN type1 CS type1 250 32 21.3 227 ± 2.5 36 ± 1 13 317 287 60 ± 1.5
40 x 370 AN type2 CS type2 370 43 22.3 332 ± 3 57 ± 1.5 18 432 405 69 max.
50 x 373 AN type2 CS type2 373 53 27.1 332 ± 3 63 ± 1.5 18 432 405 80 max.
RSSD
Vishay Sfernice Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available)
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50020
122 Revision: 30-Jun-09
MECHANICAL SPECIFICATIONS
Mechanical Protection Vishay Sfernice Special cement
Resistive Element Nickel alloy wire
Connections AN collars
CS supporting collars
Average Unit Weight 10 g 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.
RSSD
SERIES CONNECTIONS KL ± 0.5 M ± 0.5 P Ø Q R Z
APPROX.
AVERAGE UNIT
WEIGHT IN g
AN CS
25 x 138 AN type1 CS type1 27 ± 1 6.5 24 51 ± 1.5 5.7 28.5 ± 1 6 90 135
25 x 168 AN type1 CS type1 27 ± 1 6.5 24 51 ± 1.5 5.7 28.5 ± 1 6 115 160
30 x 250 AN type1 CS type1 30 ± 1 9 25 55 ± 1.5 5.7 31± 1 5 240 290
40 x 370 AN type2 CS type2 45 ± 1 9 30 81.5 max. 9.2 45 ± 1.5 10 845 925
50 x 373 AN type2 CS type2 51 ± 1.5 9 30 92.5 max. 9.2 51 ± 1.5 11.5 1270 1350
DIMENSIONS in millimeters
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 %
0.1 Ω ≤ 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 x 34 10 x 50 13 x 70 16 x 94 20 x 117 25 x 138 25 x 168 30 x 250 40 x 370 50 x 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
Document Number: 50020 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 30-Jun-09 123
RSSD
Adjustable Wirewound Vitreous Resistors
Low Ohmic Values (0.10 Ω available) Vishay Sfernice
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. =
POWER RATING TEMPERATURE RISE
MARKING
Vishay Sfernice trademark, model, style, nominal resistance (in Ω), tolerance (in %), manufacturing date.
PrRn
⁄
AMBIENT TEMPERATURE IN °C
RATED POWER IN %
100
80
60
40
0 0 100 200 300 400 450
120
RATED POWER IN W
400
300
200
100
0 10 100 1000
RSSD8x34
RSSD10x50
x
31
DSSR07
RSSD16x94
RSSD 20x117
RSSD25x138
RSSD25x168
RSSD30x250
RSSD40x370
RSSD50x 373
HOT SPOT TEMPERATURE IN °C
ORDERING INFORMATION
RSSD 10 × 50 AN 10U 5 % BA25 e
MODEL STYLE SPECIAL
DESIGN
Method No
Optional
CONNECTIONS OHMIC VALUE
Custom items are
subject to extra-charge and
min. order.
Please see price list.
TOLERANCE PACKAGING LEAD
(Pb)-FREE
GLOBAL PART NUMBER INFORMATION
GLOBAL
MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING SPECIAL
RSSD 08 x 34
10 x 50
13 x 70
16 x 94
20 x 117
25 x 138
25 x 168
30 x 250
40 x 370
50 x 373
A = AN
B = B
C = CS
F = Faston
The three first digits are
significant figures and the last
digit specifies the number of
zeros to follow.
R designates decimal point.
2002 = 20 kΩ
4710 = 470 Ω
48R5 = 48.5 Ω
R010 = 0.01 Ω
...
J = 5 %
K = 10 %
M = 20 %
Standard
packaging:
BXX = Box,
XXPCS
(fixed qty
depending on
size)
No standard
packaging:
B00 = Box,
qty open
As applicable.
Example: CB4
D2181RJR S S 53A50B1 5
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.
