Contact resistance characteristics of relays operated in vapors evaporated from cured polymeric products

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The authors have already reported that when relays were operated to break load currents in vapors evaporated from an acryl-based non-silicone-type polymeric cured product, contact resistance characteristics show no deterioration, in contrast to the cases where the same type of relays were operated in vapors from the conventional silicone-containing polymeric cured products. In this paper, UV-radiation-cured polymeric products of both the acryl-based non-silicone-type product and the silicone-containing-type product were used, and influences of their vapors on contact resistance characteristics of relays at an ambient temperature of 120℃ were studied. Specifically, a commercially-available mechanical relay (AgSnIn contacts) was sealed into a metal can with one of these products, and placed in a heating chamber to operate, at an operating frequency of 0.5 Hz, 40,000 break operations of an inductive DC 14V-1A and 14V-0.4A load currents. Contact resistance values were measured at every 50 operations. As a result, the relays sealed with the acryl-based non-silicone-type UV-cured product showed no deterioration in contact resistances. On the other hand, the relays sealed with the silicone-containing UV-cured product showed significant deteriorations and fluctuations of the contact resistance characteristics.
2011-11-10