Electrical Contacts from W-Cu Materials

W-Cu contacts are used in VACs of vacuum contactors with a nominal voltage of 1.14 kW and higher in systems for remote control of electric drivers. The contacts are a long-lasting means of switching contactors in electric circuits on and off and ensure a low cut-off current in the system.

Contract blanks consist of two heterogeneous layers (bimetallic structure): a contact layer made from a tungsten-copper material and a substratum made from copper.

Dimensions:

Grade	Nominal dimensions, mm
	Diameter	Thickness
		Disc	Contact layer	Copper layer
W70Cu30-PM	32, 48	4+2,0	2±0,5	2±0,5

Parts with contacts of other sizes can be produced at the client's request.

Physical and mechanical characteristics:

Grade	Density,  g/cm³, min	Hardness НВ, min*	Conductivity, %, min**
W70Cu30-PM	11,36	145	55

* Contact layer Brinell hardness НВ 5/250

** Contact layer conductivity in % of reference copper.

The goods material microstructure is monitored to prevent defects, and the thicknesses of the layers and the quality of the composite's transitional zone are checked.

An example of a product grade: W70Cu30-PM

You can contact our sales managers for more details at:

export_polema@metholding.com,

tel.: +7(4872)25-06-76.

Chemical composition W70Cu30-PM:

Grade, standard	Shape and Structure		Chemical composition, mass %
			W	Cu	O max	N max	S max
W70Cu30-PM Spec. 14-22-162-2002 (elsend)	Bimetallic disks made from W70Cu30 + Cu material	Contact layer	Balance	28-32	0,05	0,005	0,007
		Copper layer	-	Base	0,02	0,005	0,007