To obtain a resin composition for electrical insulation having low viscosity and low thixotropic tendency to enable easy impregnation in electrical equipments, high thermal conductivity to facilitate the dissipation of heat generated in the operation of the electrical equipments and considerably lowered precipitation speed of inorganic filler in the case of leaving at rest for long period and provide electrical equipment subjected to electrical insulation treatment with the resin composition.

The resin composition for electrical insulation contains (A) an unsaturated polyester resin and (B) fused silica. The electrical equipment is subjected to electrical insulation treatment with this resin composition.