FIELD: electricity.
SUBSTANCE: invention relates to pole part of switching device with vacuum interrupter chamber enclosed into insulation material and containing fixed and moving contacts. Herewith, cast insulating housing is open in lower part in the area of moving contact or drive rod actuating moving contact. In the area of moving contact or at the place where it is coupled with drive rod (3), at least one vent hole (7) is made which passes through the wall of insulation (2), boundary zone between insulation and electric coupling part or through electric coupling part (4) of moving contact. The vent hole (7) is formed in coupling part (4) by means of at least one through bleed screw (8) with the help of which external contact is fixed in coupling part, at the same time, a hole accommodating at least one such bleed screw is through and connects external and internal areas of pole part to be ventilated.
EFFECT: reducing pole parts heating during operation and obtaining higher allowable nominal current load.
5 cl, 1 dwg
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