Abstract: Nominal contact resistance, minimum erosion and material transfer are required with low cost materials working in a wide currents range for DC relays. Ag-Ni contact materials have low contact resistance, but the erosion and material transfer are large at high current level. Ag-SnO₂ contact materials have good anti-welding properties and resistance to arc erosion, but they have large contact resistance during working and are easily block SnO₂ from flocking together on the surface at low current level. In this paper, the failure mechanisms of Ag-Ce contact material were studied. The surface morphologies of the contacts after electrical endurance test for Ag-Ce contact material were compared with that of Ag-Ni and Ag-SnO₂ contact materials. The effect of Ce on the surface morphologies of the contacts after electrical endurance test was analyzed.

Key words: Relays, Electric contact, Failure analysis

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