A load switch comprising: an insulating housing filled with an arc extinguishing gas; a rotary blade pivotally mounted on the insulating housing and against the inner side of the insulating housing, to divide the interior of the insulating housing into two chambers (17, 18) of variable volumes, wherein, with a rotation of the rotary blade, the load switch is capable of being in at least an on state and an isolated state; an upper static contact connected to the insulating housing and not movable with respect to the insulating housing; a moving contact capable of moving along with the rotary blade so as to be conductively connected to or separated from the upper static contact; and an arc extinguishing nozzle comprising: an opening portion configured as an opening formed on the rotary blade and extending in a direction tangential to the rotary blade; and an arc confining portion disposed on an inner surface and/or outer surface of the rotary blade and designed as a hollow shape protruding inward and/or outward for a certain length in the direction tangential to the rotary blade, wherein the arc confining portion and the opening portion are in communication to form a nozzle channel, such that the arc extinguishing gas compressed by the rotary blade in one of the two chambers (17, 18) in the insulating housing is ejected along the nozzle channel when the load switch changes from the on state to the isolated state; wherein the upper static contact is configured to move away from the moving contact in and along the nozzle channel when changing from a conductively connected state to a separated state with respect to the moving contact, characterised in that the moving contact is connected to the rotary blade. an insulating housing filled with an arc extinguishing gas; a rotary blade pivotally mounted on the insulating housing and against the inner side of the insulating housing, to divide the interior of the insulating housing into two chambers (17, 18) of variable volumes, wherein, with a rotation of the rotary blade, the load switch is capable of being in at least an on state and an isolated state; an upper static contact connected to the insulating housing and not movable with respect to the insulating housing; a moving contact capable of moving along with the rotary blade so as to be conductively connected to or separated from the upper static contact; and an arc extinguishing nozzle comprising: an opening portion configured as an opening formed on the rotary blade and extending in a direction tangential to the rotary blade; and an arc confining portion disposed on an inner surface and/or outer surface of the rotary blade and designed as a hollow shape protruding inward and/or outward for a certain length in the direction tangential to the rotary blade, wherein the arc confining portion and the opening portion are in communication to form a nozzle channel, such that the arc extinguishing gas compressed by the rotary blade in one of the two chambers (17, 18) in the insulating housing is ejected along the nozzle channel when the load switch changes from the on state to the isolated state; an opening portion configured as an opening formed on the rotary blade and extending in a direction tangential to the rotary blade; and an arc confining portion disposed on an inner surface and/or outer surface of the rotary blade and designed as a hollow shape protruding inward and/or outward for a certain length in the direction tangential to the rotary blade, wherein the arc confining portion and the opening portion are in communication to form a nozzle channel, such that the arc extinguishing gas compressed by the rotary blade in one of the two chambers (17, 18) in the insulating housing is ejected along the nozzle channel when the load switch changes from the on state to the isolated state; wherein the upper static contact is configured to move away from the moving contact in and along the nozzle channel when changing from a conductively connected state to a separated state with respect to the moving contact, characterised in that the moving contact is connected to the rotary blade.