www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50008
38 Revision: 30-Aug-07
RWM
Vishay Sfernice
Enamelled Wirewound Power Resistors
Axial Leads
FEATURES
•High dissipation up to 30 W (25 °C)
•Fire Proof
•Excellent Endurance typical drift ± 1.5 % after
1000 hours
•Conformal Vitreous Enamel
•All Welded Construction
•Low ohmic values 0.1 Ω available
•Termination: Sn/Ag/Cu
As a result of more than 50 years of experience and
continuous 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
Undergoes European Quality Insurance System (CECC)
RoHS
COMPLIANT
25 min. A 25 min.
Ø 0.8 ± 0.1 Ø B
TECHNICAL SPECIFICATIONS
VISHAY
SFERNICE
STYLES
DESIGNATIONS POWER RATING Ohmic
Range in
Relation to
Tolerance
± 5 %
E24 Series
Qualified
Ohmic
Range
NF C
83-210
Limiting
Element
Voltag e
Critical
Resis-
tance
DIMENSIONS
IN mm
WEI GHT
IN g
CECC
40201
-001
CECC
40201
-002
at
+ 70 °C
at
+ 25 °C
With
Surface
Temp.
≤ + 450 °C
A Ø B
RWM 4 x 10 RB59 JB 2.6 W 3 W 5.5 W 0.1 Ω
10 kΩ
0.1 Ω
10 kΩ120 V 4.8 kΩ12 ± 1 5.5 ± 1 1
RWM 4 x 22 RB61 HB 4.5 W 5 W 7 W 0.1 Ω
16 kΩ
0.1 Ω
6.8 kΩ300 V - 22.1 ± 1 5.5 ± 1 2
RWM 5 x 26 RB57 - 6 W 7 W 10 W 0.1 Ω
27 kΩ
0.15 Ω
10 kΩ350 V 18.8 kΩ24.7 ± 1 7.4 ± 1.5 3
RWM 6 x 22 RB57 KB 6 W 7 W 10 W 0.1 Ω
39 kΩ
0.15 Ω
39 kΩ350 V 17.5 kΩ18 ± 1 6.5 ± 1 2.2
RWM 8 x 26 RB60 - 7 W 8 W 10 W 0.1 Ω
27 kΩ- 500 V - 24.7 ± 1 7.4 ± 1.5 3
RWM 6 x 34 RB60 LB 7 W 8 W 12 W 0.33 Ω
36 kΩ
0.33 Ω
15 kΩ500 V 31 kΩ33.7 ± 1 7.4 ± 1.5 4
RWM 8 x 34 RB58 - 9.5 W 11 W 14 W 0.33 Ω
36 kΩ- 650 V - 33.7 ± 1 7.4 ± 1.5 4
RWM 8 x 45 RB58 MB 9.5 W 11 W 20 W 0.47 Ω
62 kΩ
0.47 Ω
33 kΩ650 V 38 kΩ45.8 ± 2 9.4 ± 1.5 8
RWM 10 x 45 - - 21 W 25 W 25 W 0.47 Ω
62 kΩ- 800 V 25.6 kΩ45.8 ± 2 9.4 ± 1.5 8
RWM 10 x 64 - - 21 W 25 W 25 W 0.68 Ω
100 kΩ- 800 V 25.6 kΩ63.8 ± 1 9.4 ± 1.5 14
RWM 10 x 65 - - 25.8 W 30 W 30 W 0.68 Ω
100 kΩ- 800 V 21.3 kΩ63.8 ± 1 9.4 ± 1.5 14
Document Number: 50008 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 30-Aug-07 39
RWM
Enamelled Wirewound Power Resistors
Axial Leads Vishay Sfernice
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 5 mm 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.
PERFORMANCE
CECC 40201 - EN 140-201
TYPICAL DRIFTS
TESTS CONDITIONS REQUIREMENTS
Short Time Overload 10 Pr during 10 s
25 °C ambient ± (2 % + 0.1 Ω) ± (0.5 % + 0.05 Ω)
Temperature Cycling - 55 °C + 200 °C ± (1 % + 0.05 Ω) ± (0.5 % + 0.05 Ω)
Humidity (Steady State) 56 days
40 °C Ambient - R.H. 95 % ± (5 % + 0.1 Ω) ± (0.5 % + 0.05 Ω)
Terminal Strength
Tensile test: 20 N
2 successive bending
2 full rotations of 180°
± (1 % + 0.05 Ω) ± (0.1 % + 0.05 Ω)
Load Life
1000 h at Pr
90/30 Cycle
25 °C ambient
± (5 % + 0.1 Ω) ± (1.5 % + 0.05 Ω)
ELECTRICAL SPECIFICATIONS
Tolerance Standard ± 5 %
On request ± 1 % and ± 2 %
Temperature Coefficient + 75 ppm/°C typical
Dielectric Withstanding Voltage NF EN 140000 500 VRMS - 1 minute - 10 mA
Inductance non inductive (Ayrton-Perry) winding available
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50008
40 Revision: 30-Aug-07
RWM
Vishay Sfernice Enamelled Wirewound Power Resistors
Axial Leads
POWER RATING CHART
TYPICAL TEMPERATURE RISE
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).
REWOP DETAR %
AMBIENT TEMPERATURE IN °C
0 25 100 200 300 350
0
25
50
75
100
116
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
RATED POWER IN WATTS
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
4 x 22
5 x 26 - 6 x 22
6 x 34
8 x 34
8 x 45
46 x
01
8 x 26
5 4
x
0 1
5
6 x
0 1
4 x 10
Optional
ORDERING INFORMATION
RWM 4 x 10 XXX 150U ± 5 % AM500 e1
MODEL STYLE NI OPTIONAL
Non Inductive
Winding
SPECIAL
DESIGN
Method N°
Optional
OHMIC VALUE
Custom items
are subject to
extra charge and
min. order.
Please see price list.
TOLERANCE
PACKAGING LEAD
(Pb)-FREE
SAP PART NUMBERING GUIDELINES
RWM 0410 1500 J A20 E1
MODEL STYLE OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
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.
