A vacuum interrupter includes: one movable contact fixed on a movable contact stem; and one fixed contact with a fixed contact stem. The fixed contact and the movable contact are located in a electrically insulating tube, which is vacuumtightly closed by metal lids at boths sides. The fixed contact stem is placed vacuumtightly on one of the metal lids, and the movable contact stem is guided trough an opening of the opposite metal lid via an axially extendable vacuumtight bellow. In order to create a twist protection of the movable contact stem, a ring disc shaped plastic part with a central opening, through which the movable contact stem is guided, is connected externally to the vacuum interrupter such that inner spanner flats inside the opening complementarily fit closely to external spanner flats of the movable contact stem.

A switch includes a pushbutton comprising an actuating portion, a first fixed contact element and a first movable contact element facing the first fixed contact element for establishing a first switching way. The first movable contact element may include a movable portion of a first elastically deformable conductive blade. The actuating portion may include a first cam which cooperates with a cam follower portion of the first blade to deform or relax the first blade for longitudinally moving the first movable contact element to come into contact, or out of contact, with the portion of the first fixed contact element, depending on the vertical position of the actuation member. A second fixed contact element and second movable contact may be similarly constructed to provide a second switching way.

A sealing mechanism is suitable for a key device. The key device contains a key base, and the sealing mechanism contains one front ring shell, one lamp base shell and one sealing member. The front ring shell is installed on the key base, and the lamp base shell is installed on the front ring shell. The sealing member contains a sealing body and a sealing wall. The sealing wall is circularly arranged around the sealing body so as to be fixed on the lamp base shell. When the lamp base shell is installed on the front ring shell, the lamp base shell and the front ring shell respectively push the periphery of the sealing body, so that the sealing body and the front ring shell jointly form one sealing space so as to seal one first open groove on the key base.

A sealing assembly for prevention of ingress of particulates and water into an electrical switch includes an engagement element with a rigid first abutment portion for circumscribing an aperture extending through the outer surface of the switch housing and a rigid first retention portion. Also included is a sealing element being slidingly engageable with the engagement element that includes a first complementary abutment portion. The sealing element is formed from an elastically resilient polymeric material so that sealing engagement with the engagement element occludes passage and ingress of external particulates, dust and water.

A switch includes a pushbutton comprising an actuating portion, a first fixed contact element and a first movable contact element facing the first fixed contact element for establishing a first switching way. The first movable contact element may include a movable portion of a first elastically deformable conductive blade. The actuating portion may include a first cam which cooperates with a cam follower portion of the first blade to deform or relax the first blade for longitudinally moving the first movable contact element to come into contact, or out of contact, with the portion of the first fixed contact element, depending on the vertical position of the actuation member. A second fixed contact element and second movable contact may be similarly constructed to provide a second switching way.

A switch includes a pushbutton comprising an actuating portion, a first fixed contact element and a first movable contact element facing the first fixed contact element for establishing a first switching way. The first movable contact element may include a movable portion of a first elastically deformable conductive blade. The actuating portion may include a first cam which cooperates with a cam follower portion of the first blade to deform or relax the first blade for longitudinally moving the first movable contact element to come into contact, or out of contact, with the portion of the first fixed contact element, depending on the vertical position of the actuation member. A second fixed contact element and second movable contact may be similarly constructed to provide a second switching way.

A manual disconnect switching device includes an external housing having a handle actuator. The manual disconnect switching device further includes a bellows actuator in communication with the handle actuator and hermetically sealed within an internal volume of the external housing. The bellows actuator includes a shaft and a biased bellows for switching the manual disconnect switching device between open and closed positions.