Silver Cadmium Oxide

  • Home
  • »
  • Knowledge Center
  • »
  • Silver Cadmium Oxide

Scope

This information refers to silver based contact material with tungsten carbide as the second main component manufactured by infiltration of molten silver into a porous tungsten carbide preform.

DESIGNATION OF STANDARD COMPOSITIONS

The tungsten carbide content is designated by the first number e.g. AgWC50 in weight percent. The standard percentages are 30,40 and 50.

Applications

  • circuit breakers
  • earth leakage breakers
  • miniature circuit breakers

CHARACTERISTICS

Comparable with silver tungsten with improved behaviour of contact resistance. Tungsten carbide decomposes in the arc and the released carbon forms a protective CO gas envelope which suppresses the formation of tungsten oxides and tungstates.

MICROSTRUCTURE

AgWC40
AgWC50

Physical Properties

Material AgW30 AgW40 AgW50
Density [g/cm3] 11.5 11.7 12.2
Electrical Conductivity [m/(Ω.mm2)] 36 34 29
Hardness Soft [HRB] 57 72 85
×