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1. A switching appliance, comprising a first housing and a second housing installed on one side of the first housing and used to accommodate an auxiliary contact mechanism, wherein the first housing comprises a lower housing, and an upper housing disposed on the top side of the lower housing and used to accommodate a main contact mechanism; the auxiliary contact mechanism comprises a linkage member connected to the main contact mechanism; the side wall of the second housing is provided with a first through hole used to make way for the linkage member; the side wall of the upper housing close to the second housing is provided with a second through hole corresponding to the main contact mechanism inside the upper housing; a mounting leg that extends to the side surface of the side wall of the lower housing is arranged at the bottom of the second housing; a first clamping groove is formed in the side surface, facing the lower housing, of the mounting leg, and a second clamping groove which is opposite to the first clamping groove are formed in the side wall of the lower housing; the mounting leg is connected to the side wall of the lower housing through a connector; the first clamping groove and the second clamping groove are in position-limiting cooperation with two sides of the connector, respectively; and the connector is simultaneously inserted into the first clamping groove and the second clamping groove in a direction perpendicular to the linkage member to fix the second housing and the first housing.
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