GWS, GWS E, GWS Ni

www.vishay.com

Vishay Draloric

Revision: 19-Jul-16

5

Document Number: 21003

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

DESCRIPTION

Vitreous wirewound resistors are best suited for the use in

demanding environmental conditions. Their rugged design

and durable coating enable these resistors to withstand

extreme environmental stress. The vitreous coating is

designed for high stability and a long lifetime in humid

environments. The coating is resistant to all cleaning

chemicals commonly used in the electronic industry.

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

requirements

against

mechanical

resistance,

thermal

shocks, dielectric strength, and insulation resistance at high

temperatures. With different diameters and turn spacings, a

large ohmic value range can be offered. The glaze is fired

layer by layer several times at high temperatures (> 600 °C).

The resistors are marked with type, resistance, and

tolerance.

Product quality is verified by testing procedures, performed

on all individual resistors.

The GWS 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 for fixing, see

In case of the adjustable version, the slider 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.

The resistive wire is hermetically encapsulated. 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 lower continuous power applications and less demanding

environmental conditions the cement coated alternative, like

the ZWS series might be suitable, see the datasheet:

“Cemented Wirewound Resistors with Lugs”



www.vishay.com/doc?21010

For products according to MIL-PRF-26 with higher

continuous voltage, see the datasheet:

www.vishay.com/doc?21005

For low ohmic values and rated dissipation up to 1000 W,

there is the vitreous coated GBS series, see the datasheet:

“Vitreous Wirewound Resistors with Corrugated Ribbon”



www.vishay.com/doc?21004

Notes