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AgCdO is an important contact material, which has stable contact resistance and good thermal conductivity. The sublimation of CdO can cool the contact surface, reduce the energy of voltaic arc, which enables the Ag-CdO to meet the main requirements of contact in the electrical switches. It is especially applied to circuit breaker, electromagnetic switch, mini switch, motor protector, circuit starter, control switch in breaker without fuse,heavy load breaker and cam switch.AgSnO2 is a novel environment protection material, which promisingly tends to replace AgCdO. It has higher thermal stability and hardness than AgCdO, which leads to better fusion welding resistance and burning loss resistance.AgSnO2In2O3 is an alternative material for AgCdO that has highest commercial value. It has higher thermal stability and hardness than AgCdO, which leads to better fusion welding resistance and burning loss resistance. In particular, the pin oxide precipitated by internal oxidation process is erec