ZWS, ZWS E, ZWS Ni
www.vishay.com
Vishay Draloric
Cemented Wirewound Resistors with Lugs
FEATURES
• Lugs with various termination styles suitable for
soldering or bolt connection
• Excellent pulse load capability
• Adjustable type (E) available
• Non inductive type (Ni) available
• Non-flammable coating according to UL94-V0
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
The ZWS series, with a completely welded construction, is
the perfect choice for high continuous power dissipation up
to 250 W with the option for adjustable (ZWS E) and
non-inductive (ZWS Ni) types. With their extremely high
pulse power capability, they are the ideal choice as inrush
current limiters. Typical applications include but are not
limited to drive systems, power supplies, frequency
inverters, AC and DC filters, and as snubber resistors. For a
given application, requirements of ohmic value, rated
power, peak voltage, pulse shape, pulse duration,
termination style, and environmental conditions may be
submitted to recommend the most suitable product.
APPLICATIONS
• Inrush current limiter
• Capacitor charge / discharge
• Snubber resistor
• Brake resistor
• Filter resistor
TECHNICAL SPECIFICATION
TYPE /
VARIANT
RATED
DISSIPATION
P
40
6W
6W
6W
8W
8W
8W
12 W
12 W
12 W
15 W
15 W
15 W
RESISTANCE RANGE
(1)
TCR
-10 ppm/K to -80 ppm/K
WM50
0.82
to 5.1 k
2.7
to 5.1 k
0.82
to 130
0.15
to 910
1.0
to 910
0.68
to 7.5 k
3.3
to 7.5 k
0.62
to 200
0.24
to 1.3 k
1.0
to 1.3 k
0.62
to 10 k
3.0
to 10 k
0.56
to 270
0.33
to 1.8 k
1.0
to 1.8 k
0.68
to 12 k
2.2
to 12 k
0.68
to 330
0.39
to 2.2 k
1.0
to 2.2 k
RESISTANCE RANGE
(1)
TCR
+100 ppm/K to +180 ppm/K
WM110
1.8
to 13 k
-
1.8
to 4.7 k
0.33
to 2.4 k
2.0
to 2.4 k
1.8
to 20 k
-
1.8
to 6.8 k
0.56
to 3.6 k
2.0
to 3.6 k
1.8
to 27 k
-
1.8
to 9.1 k
0.75
to 5.1 k
2.0
to 5.1 k
2.2
to 33 k
-
2.2
to 11 k
0.82
to 6.2 k
2.0
to 6.2 k
RESISTANCE
TOLERANCE
± 5 %, ± 10 %
±2%
± 5 %, ± 10 %
± 10 %
±5%
± 5 %, ± 10 %
±2%
± 5 %, ± 10 %
± 10 %
±5%
± 5 %, ± 10 %
±2%
± 5 %, ± 10 %
± 10 %
±5%
± 5 %, ± 10 %
±2%
± 5 %, ± 10 %
± 10 %
±5%
OPERATING
VOLTAGE
(2)
U
max.
250 V
150 V
150 V
100 V
400 V
200 V
200 V
150 V
550 V
300 V
300 V
200 V
700 V
400 V
400 V
300 V
ZWS 6
ZWS 6 E
ZWS 6 Ni
ZWS 8
ZWS 8 E
ZWS 8 Ni
ZWS 12
ZWS 12 E
ZWS 12 Ni
ZWS 15
ZWS 15 E
ZWS 15 Ni
Revision: 19-Jul-16
Document Number: 21010
1
For technical questions, contact:
ww1resistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
ZWS, ZWS E, ZWS Ni
www.vishay.com
DESCRIPTION
The rugged design of cemented wirewound resistors enable
them to withstand extreme high pulses and makes them well
suited for use in high power / high current applications.
Production is strictly controlled and follows an extensive set
of instructions established for reproducibility. The winding is
done with specific materials on a specially developed fine
ceramic body (Al
2
O
3
). With different diameters and turn
spacings, a large ohmic value range can be offered. The
ceramic used meets the highest requirements against
mechanical resistance, thermal shock shocks, dielectric
strength, and insulation resistance at high temperatures.
The cement coating is fired layer by layer several times at
high temperatures. The resulting cement coating is resistant
to the cleaning solvents specified in IEC 60115-1
(1)
.
The resistors are marked with type, resistance, and
tolerance.
Product quality is verified by testing procedures, performed
on all individual resistors.
The ZWS series meet single lot / date code packaging
requirements.
Vishay Draloric
ASSEMBLY
The resistors are available with lug style terminals (SL style)
for soldering, multiple screw terminal options (SS style, SB
style, or SSB style) for mechanical and electrical fixing, or
fast plug terminals (FST style) for assembly / disassembly
processes. The terminals of the resistors are completely
lead (Pb)-free. The special tin plating used provides
compatibility with lead (Pb)-free and lead-containing
soldering processes.
3D-Models are available on request, please inquire at
ww1resistors@vishay.com.
Different mounting accessories are available, see the
datasheet:
www.vishay.com/doc?21015.
The slider of the adjustable type should be only moved after
removal of voltage and sufficient loosening of the screw.
APPLICATION INFORMATION
The power dissipation of the resistor generates a
temperature rise with respect to the ambient. The
permissible dissipation is derated for temperatures above
40°C, as shown in the derating diagram, in order to avoid
overheating of the resistor. The heat dissipated from the
resistor may affect adjacent components, hence proper
clearance will be required in order to avoid overheating.
All materials used are non-flammable and inorganic
according to UL 94-V0.
These resistors do not feature a limited lifetime when
operated within the permissible limits. However, resistance
value drift increasing over operating time may result in
exceeding a limit acceptable to the specific application,
thereby establishing a functional lifetime.
MATERIALS
Vishay acknowledges the following systems for the
regulation of hazardous substances:
• IEC 62474, Material Declaration for Products of and for the
Electrotechnical Industry, with the list of declarable
substances given therein
(2)
• The Global Automotive Declarable Substance List
(GADSL)
(3)
• The REACH regulation (1907/2006/EC) and the related list
of substances with very high concern (SVHC)
(4)
for its
supply chain
The products do not contain any of the banned substances
as per IEC 62474, GADSL, or the SVHC list, see
www.vishay.com/how/leadfree.
Hence the products fully comply with the following
directives:
• 2000/53/EC End-of-Life Vehicle Directive (ELV) and
Annex II (ELV II)
• 2011/65/EU Restriction of the Use of Hazardous
Substances
Directive
(RoHS)
with
amendment
2015/863/EU
• 2012/19/EU Waste Electrical and Electronic Equipment
Directive (WEEE)
Vishay pursues the elimination of conflict minerals from its
supply chain, see the Conflict Minerals Policy at
www.vishay.com/doc?49037.
RELATED PRODUCTS
In higher continuous power applications and more
demanding environmental conditions the vitreous coated
alternative, like the GWS series might be suitable, see the
datasheet:
“Vitreous Wirewound Resistors with Lugs”
www.vishay.com/doc?21003
For low ohmic values and rated dissipation up to 500 W,
there is the cemented coated ZBS series, see the datasheet:
“Cemented Wirewound Resistors with Corrugated Ribbon”
www.vishay.com/doc?21011
Notes
(1)
Other cleaning solvents with aggressive chemicals should be evaluated in actual cleaning process for their suitability.
(2)
The IEC 62474 list of declarable substances is maintained in a dedicated database, which is available at
http://std.iec.ch/iec62474.
(3)
The Global Automotive Declarable Substance List (GADSL) is maintained by the American Chemistry Council, and available at
www.gadsl.org.
(4)
The SVHC list is maintained by the European Chemical Agency (ECHA) and available at
http://echa.europa.eu/candidate-list-table.
Revision: 19-Jul-16
Document Number: 21010
5
For technical questions, contact:
ww1resistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Switching Power Supply Study Group
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