The invention relates to an electromechanical primer cap, having an explosive mixture for the selective electrical or mechanical initiation of the explosive mixture, having an outer metal cup, and electrically conductive pole piece, a firing bridge support body made of an electrically insulating material, with a through-bore, on the upper side of which a firing bridge is arranged, and having a counter surface placed onto the explosive mixture, wherein a hole through which the pole piece protrudes is constructed in the vase of the metal cup. A portion of the explosive mixture lies on a contact surface of the pole piece, and the counter surface protrudes as far as the through-bore of the firing bridge support body, or into or through the bore, and continues to just above the contact surface.