Abstract: An electrical contact includes a knife having a first portion, a second portion, and a fixed contact. The fixed contact comprises a galvanic contact point and an arc ignition point. The knife is configured to operate in a first position, where the knife insulated from the fixed contact; a second position, wherein the closest distance between the knife and the fixed contact is between the first portion and the arc ignition point to form an electrical arc between the first portion of the knife and the arc ignition point; a third position, wherein the closest distance between the knife and the fixed contact is between the second portion of the knife and the galvanic contact point; and a fourth position, where the knife and the fixed contact are electrically coupled, namely the second portion of the knife and the galvanic contact point are electrically coupled.

Abstract: The application invention generally deals with a double-pole voltage transformer enclosed in a tight enclosure made in the form of a resin cast comprising a central element integrated with a base and comprising circumferential sheds and two bushings situated above the circumferential sheds on the central element. The central element has the form of a circular cylinder situated with its side wall horizontally on the base plane, and the circumferential sheds are situated around the central element only in the area of the contact between the central element and the base, and above the circumferential sheds there are side elements of the cast forming side sheds, and above the side sheds there is situated a circumferential top shed surrounding a fragment of the side surface of the central element, and the bushings are detachably joined with the central element through projections respectively.

Abstract: The application invention generally deals with a double-pole voltage transformer enclosed in a tight enclosure made in the form of a resin cast comprising a central element integrated with a base and comprising circumferential sheds and two bushings situated above the circumferential sheds on the central element. The central element has the form of a circular cylinder situated with its side wall horizontally on the base plane, and the circumferential sheds are situated around the central element only in the area of the contact between the central element and the base, and above the circumferential sheds there are side elements of the cast forming side sheds, and above the side sheds there is situated a circumferential top shed surrounding a fragment of the side surface of the central element, and the bushings are detachably joined with the central element through projections respectively.