A low-voltage multipolar circuit breaker includes a moulded housing including a main body that is divided into interior compartments, each associated with one pole of the circuit breaker, and a cover that is mounted on the main body covering a main face of the body. The circuit breaker includes, for each pole, electrical contacts that can be separated by a device of a switching mechanism and an arc-extinguishing chamber. For at least two of the poles, the main face includes an additional aperture, each placed directly above the spark guard of the corresponding pole and placing the arc-extinguishing chamber of this pole in communication with the interior volume delimited by the cover and the main face, and the cover is attached to the main body while leaving a peripheral opening between the cover and the main body, placing the interior volume in communication with the exterior of the housing.

An apparatus is disclosed comprising a vacuum interrupter; an upper insulating shield forming part of a support structure to mechanically support the vacuum interrupter in a mounted position; a top portion of the vacuum interrupter seated in the upper insulating shield; a first lower insulating shield forming part of the support structure to mechanically support the vacuum interrupter in a mounted position; and a lower portion of the vacuum interrupter seated in the first lower insulating shield, wherein the upper insulating shield and the lower insulating shield are mechanically coupled with one another independent of the vacuum interrupter.

In accordance with certain embodiments, an improved switching mechanism and related components are provided.

In accordance with certain embodiments, an improved switching mechanism and related components are provided.

A medium-voltage switchgear system includes a three-phase circuit breaker having first, second and third single-phase vacuum interrupters connected between respective first, second and third single-phase inputs and first, second and third single-phase outputs. Magnetic actuators are connected to first, second and third single-phase vacuum interrupters, which are configured to receive an interrupt signal and in response, actuate the respective vacuum interrupter connected thereto into an open circuit condition. A controller circuit is connected to each of the first, second and third magnetic actuators and generates an interrupt signal in response to a detected single-phase overcurrent or fault on a single-phase circuit and interrupt that single-phase circuit on which the single-phase overcurrent or fault occurred and maintain power on the remaining two single-phase circuits over which a single-phase overcurrent or fault was not detected.

An electrical switchgear has a first switching contact piece and a second switching contact piece. The two switching contact pieces can be moved relative to one another by way of a kinematic chain. The kinematic chain has an axially movable drive element, which is guided in a guide element. A first pin is guided in a first gate and defines the trajectory of the drive element in the guide element.

A pressure trip unit for an electrical switch, including an actuating element and at least one flow channel per electrical pole, is disclosed. In an embodiment, the at least one pole of the electrical switch includes at least two switching contacts for making or disconnecting a flow path. The switching contacts of the at least one pole of the electrical switch are disconnectable via the actuating element which can respond to a pressure generated in a disconnection zone of the, in each case, two switching contacts by an electric arc drawn in the event of an electrodynamic recoil of the switching contacts. Further, the disconnection zone is connectable to the actuating element via the flow channel, the at least one flow channel including a nonreturn valve to permit a flow only from the disconnection zone in the direction of the actuating element.

A medium-voltage switchgear system includes a three-phase circuit breaker having first, second and third single-phase vacuum interrupters connected between respective first, second and third single-phase inputs and first, second and third single-phase outputs. Magnetic actuators are connected to first, second and third single-phase vacuum interrupters, which are configured to receive an interrupt signal and in response, actuate the respective vacuum interrupter connected thereto into an open circuit condition. A controller circuit is connected to each of the first, second and third magnetic actuators and generates an interrupt signal in response to a detected single-phase overcurrent or fault on a single-phase circuit and interrupt that single-phase circuit on which the single-phase overcurrent or fault occurred and maintain power on the remaining two single-phase circuits over which a single-phase overcurrent or fault was not detected.

Switch gear for interconnecting a plurality of power transmission lines including a number of high voltage switches arranged in three phase unitized relationship for routing power in one or multiple directions. The switches are pre-mounted on a beam to form a unitized assembly which is attached in the field to a vertical support structure or substation structure. The unitized assembly includes a telescoping base design that permits the width of the unitized assembly to be reduced so that the assembly can be transported by truck to the installation site and then the switch assembly may be extended to the final width for installation at the site. The telescopic base design is preferably cantilevered and includes free rolling capability for easily manually reducing or expanding the width of the unitized assembly when the beam is lying on a ground surface.

A drive unit for driving switching contacts of a high-voltage circuit breaker includes an operating element, and a plurality of actuating elements for actuating the switching contacts, at least two of which are disposed at a distance from one another relative to an axis or shaft. A mechanism or lever mechanism transfers a movement of the operating element into corresponding movements of the actuating elements. The mechanism includes at least one shaft, rotatably mounted on the axis, for transferring the movement of the operating element into the corresponding movement of at least one actuating element which is disposed at a distance from the operating element along the axis. The drive unit has a compensation coupling device for compensating for a delay in the transfer of movement between at least two of the actuating elements disposed at a distance from one another relative to the axis.