Silver cadmium oxide (AgCdO) contacts widely applied in full range loadings of many kinds of switches due to AdCdO contacts maintain normal temperature when Cd decomposition and evaporation by absorbing thermal energy caused by arc effect when operation, thence to provide excellent performances of stable contact resistance, good anti-welding, high wear resistance, good arc fusion resistance. The tractable process and low-cost of AgCdO contacts make them most popular yet to be valid in 2021 owing to cadmium and its compounds’ toxicity enacted to prohibit by RoHS in EU. Hence, the gradual development of environmental friendly replacements for AgCdO contacts to be industry trends and unavoidable.