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An Experimental Study on Influences of Silicon-Type and Non-Silicone-Type Polymeric Cured Materials on Contact Resistance Characteristics of Relay Contacts

A new acryl-based polymeric material (containing no silicone components) was evaluated with respect to its effects on contact resistance characteristics of relay contacts. A commercially-available mechanical relay was sealed into a metal can with the acryl-based polymeric material, and placed in a heating chamber to operate 40,000 break operations of an inductive load current (DC 14V-1A and DC 20V-1.5A) under each of 80 oC and 120 oC conditions. Contact resistance was measured over the operations. The same experiments were also conducted with two types of specific silicone-containing polymeric materials, and the experimental results were compared. As a result, relays sealed with the acryl-based polymeric material showed no significant increases in contact resistances, while relays sealed with each of the siliconecontaining polymeric materials showed remarkable increases in contact resistances, especially under the 120 oC condition, even in the case where the material is of a counter-measure type against contact failures.