Electrodes of vacuum switch

摘要

An electrode structure disposed in a vacuum switch generally comprises a pair of relatively separable electrodes and a pair of contacts provided on the opposing surfaces of the electrodes and surface areas of the contacts are selected to be smaller than the surface areas of the electrodes. The vapor pressure P0 and specific resistance rho 0 of the electrode material and the vapor pressure P1 and specific resistance rho 1 of the contact material are held in a relation <IMAGE> and values representing specific heat, heat of fusion and heat of evaporation of the contact material are 100+/-20% of those of the electrode material except a portion on which the contact material is provided.