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Composite Contact

Composite Contact
Silver-copper composite contact (Ag/Cu):
This contact has good electrical conductivity and its surface is not liable to oxidization.
The addition of 3 - 28% copper may remarkably improve the silver s flame resistance.
Hence, copper contact material may be used in current strength up to 16A. The
addition of copper, especially of high copper content, for example 10%, will greatly
reduce material transferring during DC working conditions. It is widely used
in AC contactors, relays, electric tool switches, buttons, timers, and other
household electrical appliances.
Fine crystal silver-copper composite contact:
This fine crystal silver contains a 0.12% nickel additive and has a low contact resistance, which is similar to that of pure silver, without the variable switching
times. Its fusion welding and flame resistance is slightly higher than that of
pure silver, and under almost equal contact resistance, its strength and heat
resistance are higher than that of a silver-copper composite contactor. It is suitable
for various temperature adjustments of working current 10A.
Silver-nickel-copper composite contact (Ag Ni/Cu):
In low voltage engineering, this contactor is widely used in AC switches as an electrical
contactor. Its advantages include that it may be directly soldered to contactor bridges,
without the need for additional solder layers, thus making manufacturing
of contactor components simple and economical.
Silver-cadmium oxide / copper composite contact (Ag Cd O/Cu):
This contact includes Ag Cd O10, Ag Cd O12, Ag Cd O15, and this kinds of electrical contact
has one of the most important materials in a silver-metal oxide contactor material.
The fine Cd O gives the contact special properties. When the temperature is above 900o C, Cd O sublimes, which cools the contactor surface and reduces arc energy
and extinguishments. In addition, existence of cadmium oxide will improve the welding
resistance of the contactor. Its typical applications include low voltage
contactors, relays, automatic switch flash relays, auxiliary switch series, timers,
starters, breakers and leakage protective switches.
Silver zinc oxide / copper composite contact (Ag Zn O/Cu):
The oxide of this contactor is more thermally stable than Cd O. Because of the higher
stability of Zn O and Ag Zn O, the contactor material increases the contactor resistance,
which would be compensated through structural means, such as a higher
contacting force.

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