copper-silver contact material
A copper-silver contact material increases the softening temperature and improves the burn-off resistance in electrical switching elements. This leads to more reliability and longer service lives.
Physicochemical mechanism of action
Copper-silver contact materials contain silver, which increases the softening temperature of copper. This prevents rapid cooling and the formation of oxidative compounds on the contact surfaces.
Metallurgical relevance & risks during welding
Too high a silver content can lead to fusion of the contacts, which leads to increased resistance and unreliable switching. Too low a silver content reduces the softening effectiveness and the burn-off resistance.
Workshop practice & instructions
Use contact materials with a silver content of 1-2% for optimum performance. Ensure that the switching elements are handled correctly during assembly and welding in order to obtain the desired burn-off resistance.