Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1977-04-13
1979-04-03
Hart, Ro E.
Electricity: circuit makers and breakers
Electric switch details
Contact
H01H 102
Patent
active
041479092
ABSTRACT:
The invention relates to a sintered composite material as the contact material for medium-voltage vacuum power circuit breakers, particularly in the switching voltage range from 7.2 kV to 36 kV. The contact material is comprised of a sintered composite of a burn-off-resistant metal component such as iron, cobalt, chromium, nickel, zirconium or alloys or mixtures of these metals, and a component which lowers the breaking current. As the breaking current-lowering component are provided metals, compounds or alloys of metals having a boiling point above 2400.degree. C. such as, for example, tin, chromium carbide (Cr.sub.3 C.sub.2) or copper zirconide (ZrCu.sub.4, ZrCu.sub.3).
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Hassler Heinrich
Kippenberg Horst
Hart Ro E.
Siemens Aktiengesellschaft
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