In order to avoid the sake of silver contact burning, static contact terminal into a curved shape, intermediate contact protruding part. So the arc will not on the contact surface of the combustion. It is a kind of better contact form, and its application is increasingly extensive. The working process of the contact of the contact is put forward a number of requirements for the material. Because copper has good electrical conductivity and thermal conductivity. Enough hardness. Higher melting point, easy processing. So it is widely used as a contact conductive part of high voltage circuit breaker. But by the hand of copper is easily oxidized, the oxidation of the contact resistance. So in some circuit breakers, the copper covered silver layer outside the main contact.

Silver has good conductivity, the oxide film is conductive, can improve the working performance of silver plated copper contact. With the frequent use of circuit breaker, silver contact arc thermal effects were significantly increased, the contact surface may be a serious loss, so the silver contact heat resistance, resistance to arc resistance, abrasion resistance and put forward higher requirements. Powder metallurgy method has opened up a new way for the development of contact materials.

Powder metallurgy instead of using ordinary metallurgical method, but the two kinds of metal powder mixed together in the mould pressing forming. In the protective gas (hydrogen) in the sintering process. This kind of gold is actually a mixture of taiwan. Because the process is similar to the ceramic product, it is also called the mold alloy. High voltage circuit breaker is widely applied with the copper tungsten, silver nickel, silver, graphite as the contact resistance to arc or ring arc resistance. Used in relays, contactors, air switches, limit flow switch, motor protector, micro switch, instrumentation, home appliances, automobile electrical (light switch and starting motor load switch), leakage protection switch. Compared with the silver cadmium oxide, silver tin oxide does not contain the toxic metal cadmium, in which the metal oxide with high thermal stability, with good electrical and thermal conductivity, in the on-off process has high heat resistance, arc erosion resistance and anti welding, so as to ensure the reliability of operation of electric appliances, increase the service life. And rapid development of silver tin oxide, even in some of the electrical switch without making big changes can be directly used silver tin oxide to replace AgCdO. Uses range from 10A – 100A, in many performance close to even better than silver cadmium oxide.

Containing amount of silver in order to avoid contact burning reasons, static contact terminal into a curved shape, dynamic contact in the middle part of processes. So the arc will not on the contact surface of the combustion. It is a kind of better contact form, and its application is increasingly extensive. The working process of the contact of the contact is put forward a number of requirements for the material. Because copper has good electrical conductivity and thermal conductivity. Enough hardness. Higher melting point, easy processing. So it is widely used as a contact conductive part of high voltage circuit breaker. But by the hand of copper is easily oxidized, the oxidation of the contact resistance. So in some circuit breakers, the copper covered silver layer outside the main contact.

Silver has good conductivity, the oxide film is conductive, can improve the working performance of silver plated copper contact. With the frequent use of circuit breaker, contact arc thermal effect significantly increases, contact surface may be a serious loss, so the silver contact heat resistance, resistance to arc resistance, abrasion resistance and put forward higher requirements. Powder metallurgy method has opened up a new way for the development of contact materials.