An experimental study on contact resistance characteristics of relay contacts operated in the vicinity of polymer materials

概要

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A commercially-available mechanical relay (AgSnIn contacts) was sealed into a can with a silicone-containing polymer material or an acryl-based non-silicone-containing polymer material, and placed in a heating chamber to operate, at an operating frequency of 1Hz or 0.5Hz, 40,000 break operations in an inductive DC14V-1A load circuit, an inductive DC 14V-0.4A load circuit, an inductive DC5V-1A load circuit, or a resistive DC 14V-1A load circuit, at an elevated temperature of 120℃. Contact resistance values were measured at every 50 operations, and comparisons were made among the obtained results. In the relay operations at 0.5Hz in the vicinity of the silicone-containing polymer material, significant deteriorations of contact resistances were observed even at the inductive DC14V-0.4A or 5V-1A conditions. With the acryl-based non-silicone-containing polymer material, no deterioration in contact resistances was observed at each condition. Arcing characteristics have to be taken into consideration for investigating influences of polymer materials on contact reliability.
2010-11-04