A fixing module is for fixing a push button or emergency stop button or rotary actuator of a control and signaling device. In an embodiment, the fixing module is constructed from a top housing part and a bottom housing part, each including a cuboidal structure with a top side, an underside and four side parts connecting the top side to the underside. In at least one embodiment, on the top side of the bottom housing part, a material that extends at least partially in this plane and has a grounding function is formed or an electrically conductive component made of metal with a grounding function is arranged.

An earthing switch includes a fixed contact part fixed in an enclosure, a movable contact part disposed to face the fixed contact part, having a hollow portion formed therein, and having one end portion connected to a driving device and driven by the driving device so that the other end portion thereof is connected to or separated from the fixed contact part, and a piston part located in the hollow portion and moving relative to the movable contact part, wherein the hollow portion extends in a longitudinal direction of the movable contact part, both end portions of the hollow portion in the longitudinal direction are formed to be open, and the piston part includes a gas flow path formed therein.

An earthing switch includes a fixed contact part fixed in an enclosure, a movable contact part disposed to face the fixed contact part, having a hollow portion formed therein, and having one end portion connected to a driving device and driven by the driving device so that the other end portion thereof is connected to or separated from the fixed contact part, and a piston part located in the hollow portion and moving relative to the movable contact part, wherein the hollow portion extends in a longitudinal direction of the movable contact part, both end portions of the hollow portion in the longitudinal direction are formed to be open, and the piston part includes a gas flow path formed therein.

An earthing switch includes a fixed contact part fixed in an enclosure, a movable contact part disposed to face the fixed contact part, having a hollow portion formed therein, and having one end portion connected to a driving device and driven by the driving device so that the other end portion thereof is connected to or separated from the fixed contact part, and a piston part located in the hollow portion and moving relative to the movable contact part, wherein the hollow portion extends in a longitudinal direction of the movable contact part, both end portions of the hollow portion in the longitudinal direction are formed to be open, and the piston part includes a gas flow path formed therein.

An earthing switch includes a fixed contact part fixed in an enclosure, a movable contact part disposed to face the fixed contact part, having a hollow portion formed therein, and having one end portion connected to a driving device and driven by the driving device so that the other end portion thereof is connected to or separated from the fixed contact part, and a piston part located in the hollow portion and moving relative to the movable contact part, wherein the hollow portion extends in a longitudinal direction of the movable contact part, both end portions of the hollow portion in the longitudinal direction are formed to be open, and the piston part includes a gas flow path formed therein.

The circuit breaker system contains a plurality of phase conductors, a circuit breaker having a plurality of breaker poles, and a short-circuit link having a star point and a plurality of link conductors combined at the star point. Each of the phase conductors is electrically conductively connected to in each case one of the breaker poles and each link conductor is electrically conductively connected to in each case one of the phase conductors in each case one of several first disconnectors to which short-circuit current can be applied. In order to avoid expenditure on assembly and downtimes of the circuit breaker system when carrying out simulation experiments with the aid of the short-circuit link, the circuit breaker system contains a second disconnector which, when closed, electrically conductively connects the star point to ground and which is opened when a short-circuit current is applied to the short-circuit current link.

A microelectromechanical system (MEMS) switch apparatus for handling input voltages higher than a standoff voltage of each MEMS switch in the MEMS switch apparatus may comprise at least one pair of MEMS switches. Each pair of MEMS switches may comprise a first MEMS switch and a second MEMS switch electrically coupled to the first MEMS switch at a midpoint. The first and second MEMS switches may be arranged in a back-to-back configuration. Each pair of MEMS switches may further comprise an input electrically coupled to the first MEMS switch, an output electrically coupled to the second MEMS switch, at least one input component electrically coupled across the first MEMS switch from the input to the midpoint, and at least one output component electrically coupled across the second MEMS switch from the midpoint to the output.

A microelectromechanical system (MEMS) switch apparatus for handling input voltages higher than a standoff voltage of each MEMS switch in the MEMS switch apparatus may comprise at least one pair of MEMS switches. Each pair of MEMS switches may comprise a first MEMS switch and a second MEMS switch electrically coupled to the first MEMS switch at a midpoint. The first and second MEMS switches may be arranged in a back-to-back configuration. Each pair of MEMS switches may further comprise an input electrically coupled to the first MEMS switch, an output electrically coupled to the second MEMS switch, at least one input component electrically coupled across the first MEMS switch from the input to the midpoint, and at least one output component electrically coupled across the second MEMS switch from the midpoint to the output.

A wireless smart switch, comprising: an actuator, a circuit assembly, comprising at least a controller, a battery, and a transceiver, the controller being powered by the battery and being programmed to send one or more command signals via the transceiver, according to a user input from the actuator; a back-body, the back-body having a rear surface adapted to be mounted to a surface of a wall or to a wall box; and a ground wire, the ground wire being seated within a recess defined within the rear surface of back-body, the ground wire having a fixed end and a free end such that the free end can be drawn away from the back body and connected to a ground wire within a wall box.