ZWS, ZWS E, ZWS Ni

www.vishay.com

Vishay Draloric

Revision: 19-Jul-16

5

Document Number: 21010

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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

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

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.

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

• The

Global

Automotive

Declarable

Substance

List

• The REACH regulation (1907/2006/EC) and the related list

supply chain

The products do not contain any of the banned substances

as per IEC 62474, GADSL, or the SVHC list, see

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

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

Different mounting accessories are available, see the

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.

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