An add on device assembly for surge arresters used in substation, distribution and transmission applications that provides a means to electrically and mechanically disconnect a surge arrester at the end of life, such that it leaves a physical dimension between electrodes that is able to withstand normal system voltage and at the same time continue to provide surge protection until the arrester is replaced. The assembly contains a spring locking assembly that will lock a line spacing buss in an open position post isolator operation. The resultant gap is set to provide sufficient air insulation for system voltage and at the same sufficient surge protection for the system Basic Insulation Level.

An add on device assembly for surge arresters used in substation, distribution and transmission applications that provides a means to electrically and mechanically disconnect a surge arrester at the end of life, such that it leaves a physical dimension between electrodes that is able to withstand normal system voltage and at the same time continue to provide surge protection until the arrester is replaced. The assembly contains a spring locking assembly that will lock a line spacing buss in an open position post isolator operation. The resultant gap is set to provide sufficient air insulation for system voltage and at the same sufficient surge protection for the system Basic Insulation Level.

A push button switch may include a housing, an operation unit, and, a lock lever unit. A lever body of the lock lever unit may have a locking portion capable of locking one end of a long jig in an extending direction. The housing may have a fulcrum projection that contacts an intermediate portion of the jig having the one end locked to a locking portion when the lever body is moved using the jig, and serves as a rotation fulcrum of the jig.

A push-button switch may include a housing, a plunger, an operation unit, a transmission mechanism, a contact mechanism, and a biasing portion. The plunger may have a first plunger that is disposed in series with the first plunger. The first plunger and the second plunger may be movable independently of each other. The contact mechanism may be configured to be opened/closed by movement of the second plunger.

A push-button switch may include a housing, a plunger, an operation unit, a transmission mechanism, a contact mechanism, and a biasing portion. The plunger have a first plunger and a second plunger that is disposed in series with the first plunger. The first plunger and the second plunger may be movable independently of each other. The contact mechanism may be configured to be opened/closed by movement of the second plunger.

A push-button switch may include a housing, an operation unit, and, a lock lever unit. A lever body of the lock lever unit may have a locking portion capable of locking one end of a long jig in an extending direction. The housing may have a fulcrum projection that contacts an intermediate portion of the jig having the one end locked to a locking portion when the lever body is moved using the jig, and serves as a rotation fulcrum of the jig.

A push-button switch may include a housing, an operation unit, a lock lever unit, a transmission mechanism, a movement regulating portion, a contact mechanism, and a first biasing portion. The movement regulating portion enables movement of a lever body to a second position when an end of the operation unit on a housing portion side is positioned at an initial position, and disables movement of the lever body to the second position when the end of the operation unit on the housing portion side is positioned closer to an operation surface than the initial position in a movable direction. The first biasing portion biases the plunger from an operating position toward a return position.

A switch assembly includes a panel defining an aperture therethrough and a switch subassembly having a switch housing. At least one tab extends from the housing, the tab having a first portion extending away from the housing and toward the back side of the panel to a projection, the projection spaced in a longitudinal direction from the back side of the panel and laterally outward of the aperture when the tab is in a relaxed state, and a second portion that extends from the projection in the longitudinal direction and terminates in a tab end disposed within the aperture. The tab end is accessible from the front side of the panel and the tab is sufficiently flexible such that flexing the tab end inwardly from the front side causes the projection to flex inwardly from the relaxed state to a point where the projection can pass through the aperture.

A switch assembly includes a panel defining an aperture therethrough and a switch subassembly having a switch housing. At least one tab extends from the housing, the tab having a first portion extending away from the housing and toward the back side of the panel to a projection, the projection spaced in a longitudinal direction from the back side of the panel and laterally outward of the aperture when the tab is in a relaxed state, and a second portion that extends from the projection in the longitudinal direction and terminates in a tab end disposed within the aperture. The tab end is accessible from the front side of the panel and the tab is sufficiently flexible such that flexing the tab end inwardly from the front side causes the projection to flex inwardly from the relaxed state to a point where the projection can pass through the aperture.

A switch assembly includes a panel defining an aperture therethrough and a switch subassembly having a switch housing. At least one tab extends from the housing, the tab having a first portion extending away from the housing and toward the back side of the panel to a projection, the projection spaced in a longitudinal direction from the back side of the panel and laterally outward of the aperture when the tab is in a relaxed state, and a second portion that extends from the projection in the longitudinal direction and terminates in a tab end disposed within the aperture. The tab end is accessible from the front side of the panel and the tab is sufficiently flexible such that flexing the tab end inwardly from the front side causes the projection to flex inwardly from the relaxed state to a point where the projection can pass through the aperture.