ZWK, ZWK Ni
www.vishay.com
Vishay Draloric
Cemented Wirewound Resistors with Ferrules
FEATURES
• Excellent pulse load capability
• High operating voltage up to 7350 V
• Non inductive type (Ni) available
• Different caps options:
- GDK style with different inner threads
- GZK made from drawn brass, nickel plated
The ZWK series, with completely welded construction, is the
perfect choice for high continuous power dissipation up to
150 W with the option for a non-inductive type (ZWK Ni).
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. Specific application requirements
(ohmic value, rated power, peak voltage, pulse shape, pulse
duration, termination style, and environmental conditions)
can be submitted to Vishay for a recommendation of the
most suitable product.
• Easy to change when mounted with spring clips
• Non-flammable according to UL 94-V0
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
APPLICATIONS
• Inrush current limiter
• Capacitor charge / discharge
• Snubber resistor
• Brake resistor
• Filter resistor
TECHNICAL SPECIFICATION
TYPE /
VARIANT
RATED
DISSIPATION
P
40
10 W
RESISTANCE RANGE
(1)
TCR
-10 ppm/K to -80 ppm/K
WM50
0.47
to 8.2 k
0.51
to 8.2 k
5.1
to 8.2 k
0.24
to 1.5 k
1.0
to 1.5 k
0.47
to 12 k
0.51
to 12 k
5.1
to 12 k
0.36
to 2.2 k
0.75
to 2.2 k
0.75
to 20 k
2.0
to 20 k
0.56
to 3.3 k
1.5
to 36 k
2.2
to 20 k
1.1
to 6.8 k
1.8
to 47 k
2.0
to 47 k
1.5
to 8.2 k
2.7
to 75 k
2.7
to 75 k
2.2
to 13 k
4.7
to 130 k
4.7
to 130 k
3.9
to 24 k
RESISTANCE RANGE
(1)
TCR
+100 ppm/K to +180 ppm/K
WM110
1.5
to 22 k
1.5
to 22 k
-
0.56
to 3.9 k
1.0
to 3.9 k
1.1
to 33 k
1.2
to 33 k
-
0.82
to 5.6 k
1.0
to 5.6 k
1.6
to 51 k
-
1.3
to 9.1 k
3.3
to 100 k
-
2.7
to 18 k
4.3
to 130 k
-
3.3
to 24 k
6.2
to 200 k
-
5.1
to 36 k
11
to 360 k
-
9.1
to 62 k
RESISTANCE
TOLERANCE
±10 %
±5 %
±2 %
±10 %
±5 %
±10 %
±5 %
±2 %
±10 %
±5 %
±10 %, ±5 %
±2 %
±10 %, ±5 %
±10 %, ±5 %
±2 %
±10 %, ±5 %
±10 %, ±5 %
±2 %
±10 %, ±5 %
±10 %, ±5 %
±2 %
±10 %, ±5 %
±10 %, ±5 %
±2 %
±10 %, ±5 %
OPERATING
VOLTAGE
U
max.
ZWK 10
ZWK 10 Ni
10 W
ZWK 15
15 W
ZWK 15 Ni
ZWK 20
ZWK 20 Ni
ZWK 40
ZWK 40 Ni
ZWK 60
ZWK 60 Ni
ZWK 90
ZWK 90 Ni
ZWK 150
ZWK 150 Ni
15 W
20 W
20 W
40 W
40 W
60 W
60 W
90 W
90 W
150 W
150 W
P
x
R
Notes
• The operating temperature range for these resistors is from -55 °C up to 250 °C
(1)
Resistance values are to be selected for ± 10 % from the E12 series, and for ± 5 % and ± 2 % from the E24 series
Revision: 07-Feb-17
Document Number: 21012
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
ZWK, ZWK Ni
www.vishay.com
DESCRIPTION
The rugged design of cemented wirewound resistors
enables 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,
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, tolerance
and winding material.
Product quality is verified by testing procedures, performed
on all individual resistors.
The ZWK series meet single lot / date code packaging
requirements.
Vishay Draloric
ASSEMBLY
The resistors are available with two different termination
styles.
The GDK style has machined caps made from brass material
CW608N which is plated with nickel. The standard internal
thread size is M4 acc. to DIN 13-1. For custom inner thread
sizes, contact:
ww1resistors@vishay.com.
The GZK style has termination caps made from drawn brass
plated with nickel.
It is easy to install / replace these components with either
termination style if they are mounted with spring clips. For
details about mounting accessories offered, see the
datasheet:
www.vishay.com/doc?21015.
For special windings or non-inductive (GWK Ni) versions,
please contact:
ww1resistors@vishay.com.
3D-Models are available upon request, please contact:
ww1resistors@vishay.com.
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, therefore proper
clearance is 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, a vitreous coated
alternative like the GWK series might be suitable. See the
datasheet:
“Vitreous Wirewound Resistors with Ferrules”
www.vishay.com/doc?21006
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: 07-Feb-17
Document Number: 21012
3
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
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