Contact resistance characteristics of relays operated in vapors evaporated from non-silicone-type acryl-based polymeric products cured in various manners

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 that can be used as replacement of conventional silicone-type products, the resultant contact resistance characteristics show no deterioration. In this paper, the acryl-based non-silicone-type product of UV-radiation-cured type was used, and influences of its vapors on contact resistance characteristics of relays at an ambient temperature of 120°C were studied. Specifically, a commercially-available mechanical relay (AgSnIn contacts) was sealed into a metal can with the product, and placed in a heating chamber to operate, at an operating frequency of 1 Hz or 0.5 Hz, 40 000 break operations of an inductive DC 14V-1A or 14V-0.4A load current. Contact resistance values were measured at every 50 operations. As a result, the relays showed no deterioration in contact resistances.