Mold varnish, resin cured material, electric power apparatus, and vacuum circuit breaker

Provided is a mold varnish having excellent storage stability and low viscosity, a cured material thereof also having excellent toughness. The present invention uses a mold varnish comprising the three liquids of: a main agent A containing an epoxy resin which is liquid at normal temperature and has an epoxy equivalent of 200 g/eq or less, and a radical polymerization initiator; a curing agent B containing an acid anhydride which is liquid at normal temperature and an epoxy curing catalyst; and a reaction inducer C containing an acid anhydride which is liquid at normal temperature, an N-phenylmaleimide, and a styrene containing a polymerization inhibitor.