RWM
Vishay Sfernice
Enamelled Wirewound Power Resistors
Axial Leads
FEATURES
• High dissipation
• High reliability level
– Fire Proof
– Excellent Endurance
– Great Mechanical Strength
– Good Environmental Protection
– Conformal Vitreous Enamel – All Welded Construction
• Low ohmic values
As a result of more than 50 years of experience and continu-
ous improvements the RWM Series of resistors features
proven reliability in AC or DC applications.
The high quality of the RWM resides mainly in the use
of a proprietary VISHAY SFERNICE enamel fired at high
temperature and free from any compound liable to corrode
the resistive wire.
The performance of this series of professional resistors fully
meets the requirements of the following specifications:
– NF C 83-210-001
– CECC 40201-001
– BS - CECC 40201-002
DIMENSIONS
in millimeters
25 min.
A
25 min.
ØB
Ø 0.8
±
0.1
TECHNICAL SPECIFICATIONS
VISHAY
SFERNICE
STYLES
DESIGNATIONS
CECC
40201
-001
NFC
83-210
-001
RB59
RB61
RB57
RB57
RB60
RB60
RB58
RB58
–
–
–
BS
CECC
40201
-002
JB
HB
–
KB
–
–
–
–
–
–
–
Ohmic Qualified
Range in Ohmic Limiting Critical
With
at
Surface Relation to Range Element Resis-
at
Voltage tance
NF C
+ 70 °C + 25 °C Temp. Tolerance
±5%
83-210
≤
+ 450 °C E24 Series
2.6 W
4.5 W
6W
6W
7W
7W
9.5 W
9.5 W
21 W
21 W
25.8 W
3W
5W
7W
7W
8W
8W
11 W
11 W
25 W
25 W
30 W
5.5 W
7W
10 W
10 W
10 W
12 W
14 W
20 W
25 W
25 W
30 W
0.1
Ω
10 kΩ
0.1
Ω
16 kΩ
0.1
Ω
27 kΩ
0.1
Ω
39 kΩ
0.1
Ω
27 kΩ
0.33
Ω
36 kΩ
0.33
Ω
36 kΩ
0.47
Ω
62 kΩ
0.47
Ω
62 kΩ
0.68
Ω
100 kΩ
0.68
Ω
100 kΩ
0.1
Ω
10 kΩ
0.1
Ω
6.8 kΩ
0.15
Ω
10 kΩ
0.15
Ω
39 kΩ
–
0.33
Ω
15 kΩ
–
0.47
Ω
33 kΩ
–
–
–
120 V
300 V
350 V
350 V
500 V
500 V
650 V
650 V
800 V
800 V
800 V
4.8 kΩ
–
POWER RATING
DIMENSIONS
IN MM
Weight
in g
A
ØB
RWM 4 x 10
RWM 4 x 22
RWM 5 x 26
RWM 6 x 22
RWM 8 x 26
RWM 6 x 34
RWM 8 x 34
RWM 8 x 45
RWM 10 x 45
RWM 10 x 64
RWM 10 x 65
12
± 1
22.1
± 1
5.5
± 1
5.5
± 1
7.4
± 1.5
6.5
± 1
7.4
± 1.5
7.4
± 1.5
7.4
± 1.5
9.4
± 1.5
9.4
± 1.5
9.4
± 1.5
9.4
± 1.5
1
2
3
2.2
3
4
4
8
8
14
14
±1
18.8 kΩ 24.7
17.5 kΩ
–
31 kΩ
–
38 kΩ
18
± 1
24.7
± 1
33.7
± 1
33.7
± 1
45.8
± 2
±2
25.6 kΩ 45.8
±1
25.6 kΩ 63.8
±1
21.3 kΩ 63.8
Undergoes European Quality Insurance System (CECC)
www.vishay.com
38
For technical questions, contact sfer@vishay.com
Document Number: 50008
Revision 17-Nov-05
RWM
Enamelled Wirewound Power Resistors
Axial Leads
PERFORMANCE
CECC 40201
TYPICAL DRIFTS
TESTS
Short Time Overload
Temperature Cycling
CONDITIONS
10 Pr during 10 s.
25 °C ambient
– 55 °C
+ 200 °C
REQUIREMENTS
± (2 %
± (1 %
+ 0.1
Ω)
+ 0.05
Ω)
+ 0.1
Ω)
+ 0.05
Ω)
+ 0.1
Ω)
± (0.5%
± (0.5 %
+ 0.05
Ω)
+ 0.05
Ω)
+ 0.05
Ω)
+ 0.05
Ω)
+ 0.05
Ω)
Vishay Sfernice
Humidity (Steady State)
56 days
40 °C Ambient - R.H. 95 %
Tensile test: 20 N
2 successive bending
2 full rotations of 180°
1000 h at Pr
90/30 Cycle
25 °C ambient
± (5 %
± (0.5 %
Terminal Strength
± (1 %
± (0.1 %
Load Life
± (5 %
± (1.5 %
OVERLOAD
Heavy overloads can be endured in the form of short pulses < 0.1 s. Particular requirements should be submitted to Vishay
Sfernice, specifying peak voltage, cycle and environmental conditions.
RECOMMENDATIONS FOR USE
Since these components are high dissipation power resistors, customers are advised to use a high melting point solder.
For low ohmic values, the measurement becomes critical and the connecting wires resistance is to be included. The value
is measured at 5mm from the resistor body.
Group Mounting
In a still atmosphere, a distance between axes equal to five times the resistor’s diameter is recommended.
Cabinet Mounting
• Unventilated box: dissipation should be reduced (see dimensional drawing).
• Forced ventilation: if conditions are appropriate, dissipation may be doubled or even trebled.
• In any case: the surface temperature at the hottest point should not exceed 450 °C.
These aspects should be considered by the end user.
ELECTRICAL SPECIFICATIONS
Tolerance
Standard
On request
Temperature Coefficient + 75 ppm/°C typical
Dielectric Withstanding Voltage NF EN 140000
Inductance
500 VRMS - 1 minute - 10 mA
non inductive (Ayrton-Perry)winding available
±5%
± 1 % to ± 10 %
Document Number: 50008
Revision 17-Nov-05
For technical questions, contact sfer@vishay.com
www.vishay.com
39
RWM
Vishay Sfernice
POWER RATING CHART
Enamelled Wirewound Power Resistors
Axial Leads
116
100
% RATED POWER
75
50
25
0
0
25
100
200
AMBIENT TEMPERATURE IN °C
300
350
TYPICAL TEMPERATURE RISE
x2
10
4x
4x
-6
8x
6x
x
8
45
10
x
22
26
34
34
x4
5
x
10
2
64
x6
5
HOT SPOT TEMPERATURE IN °C
300
200
5x
400
26
8
10
100
Optional
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
RATED POWER IN WATTS
MARKING
Sfernice trademark, model and style, CECC style, if applicable (except for the smallest model due to lack of space: (4 x 10 or
RB 59), ohmic value, resistance tolerance, manufacturing date (year - month).
ORDERING INFORMATION
RWM
MODEL
8 x 45
STYLE
NI OPTIONAL
XXX
SPECIAL
DESIGN
Method N°
Optional
1.6 kΩ
OHMIC VALUE
±5%
TOLERANCE
PACKAGING
Non Inductive
Winding
Custom items are
subject to extra
charge and min.
order.
Please see price list.
Document Number: 50008
Revision 17-Nov-05
www.vishay.com
40
For technical questions, contact sfer@vishay.com
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
1
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