The invention concerns a double-motion circuit breaker comprising primary and secondary movable contacts slidingly mounted within primary and secondary holders, wherein the primary movable contact comprises a tulip and a contact cylinder attached thereto, and the secondary movable contact comprises a pin for engaging the tulip but no counter-contact for engaging the contact cylinder. The circuit breaker also has a non-linear linkage mechanism with a pin and slot mechanism, and a fixed dielectric shield provided on the secondary holder. During disconnection, the linkage mechanism is preferably arranged to move the pin more than the tulip, proportionally to their maximum stroke, so as to quickly bring the pin tip within the fixed dielectric shield, whereafter the tulip moves more than the pin. This circuit breaker is cheaper, lighter and can be disconnected more quickly.

To provide a gas circuit breaker having a space-saving reliable double motion mechanism having a high degree of freedom in design. A double motion mechanism section of the gas circuit breaker is formed of a drive-side connecting rod, a driven-side connecting rod, levers connecting them and a guide regulating operations of the drive-side connecting rod and the driven-side connecting rod. A movable pin is connected to a first grooved cam formed in the drive-side connecting rod, a second grooved cam formed in the guide and third grooved cams formed in the levers respectively, and posture holding members are provided in the movable pin. The movable pin moves in the respective grooved cams by an operation of the drive-side connecting rod, thereby rotating the levers, driving the driven-side connecting rod in an opposite direction of the drive-side connecting rod, and driving the driven-side arcing contact in an opposite direction of the driven-side arcing contact.

A switching device arrangement has a first contact set and a second contact set. The first contact set includes a first electric arc contact element and a first nominal current contact element. The first nominal current contact element can be moved relative to the first electric arc contact element. A first transmission is introduced in a kinematic chain in order to generate a relative movement of the first nominal current contact element and the first electric arc contact element. The first transmission is operationally connected between a stationary counter bearing and the first electric arc contact piece.

A switching arrangement has a first contact set and a second contact set which can be moved with respect to the first contact set, and an insulating nozzle arrangement. The insulating nozzle arrangement is supported on the first contact set which includes a first arcing contact piece. The first arcing contact piece can be moved with respect to the insulating nozzle arrangement.

To provide a gas circuit breaker having a space-saving and highly reliable double motion mechanism with high design freedom. In a double motion mechanism of the gas circuit breaker, a driven side movable pin is communicated with a lever driven side hole cut in the opposite side with respect to a rotation axis of a lever. A round hole through which a driving side movable pin is inserted and an elongate hole through which the driven side movable pin is inserted are cut in the outside of the lever. A position retaining member to suppress rotation of the driving side movable pin about two axes vertical to a pin axis is provided. The driving side movable pin is moved in respective grooved cams with an operation of the driving side rod, to rotate the lever, drive the driven side connecting rod in an opposite direction to the driving side connecting rod, and drive the driven side arcing contact in an opposite direction to the driving side arcing contact.

A vacuum interrupter including a first movable contact and electrode contained within a vacuum chamber, a second movable contact and electrode contained within the vacuum chamber, a first actuator operably coupled to the first movable contact, and a second actuator operably coupled to the second movable contact. The vacuum interrupter also includes a first bellows and first bellows plate operably coupled to the first movable electrode, as well as a second bellows and second bellows plate operably coupled to the second movable electrode. Additionally, the vacuum interrupter includes a first pressure chamber located between the first actuator and the vacuum chamber, and a second pressure chamber located between the second actuator and the vacuum chamber.

An electrical switch assembly includes a contact element to be moved towards a further contact element for generating an electrical connection; and a drive for moving the contact element; wherein the drive includes a plunger with a connection member interconnected with the contact element; wherein the plunger includes a mechanical structure with a top side to which the connection member is connection, and a bottom side opposite to the top side; wherein the drive includes a Thomas coil for moving the plunger via an electrically conducting top face, which is provided on the top side and an electrically conducting bottom face, which is provided on the bottom side. The mechanical structure includes at least one channel between the top side and the bottom side, the at least one channel extending transverse to a movement direction of the plunger. Furthermore, the mechanical structure fills less than 50% of a volume between the top side and the bottom side.

An object is to enhance direct-current insulating performance of a gas-blast circuit breaker. The gas-blast circuit breaker includes: a pair of main contacts disposed in a gas tank to face each other and configured to operate for opening and closing a circuit; a pair of arc contacts disposed to face each other and configured to operate for opening and closing the circuit, the arc contacts being disposed coaxially with the main contacts at locations close to the centers of the main contacts, respectively; and an elastic electrically conductive material disposed on an outer surface of an insulating nozzle facing an inner surface of one of the main contacts.

A disconnect switch assembly includes first and second disconnect switches with each of the first and second disconnect switch including a housing, a fixed main contact in the housing, and a movable main contact in the housing in cooperating alignment with the fixed main contact. Each of the movable main contacts is coupled to a (common) first actuator. A second actuator is coupled to the housing of the first disconnect switch and a third actuator is coupled to the housing of the second disconnect switch. The first actuator is configured to concurrently apply first and second motive forces (in opposing but in-line directions) to the movable contacts of the first and second disconnect switches. The second and third actuators are configured to apply a motive force to the housings that is in a direction opposing a respective motive force applied by the first actuator to the movable main contacts.

A circuit breaker includes a compact pole unit with an encapsulated body having ring(s) and conducting terminals that each extend from the encapsulated body. The body includes a vacuum interrupter and a coupler assembly that may be integrated into the pole unit. The coupler assembly includes a contact spring positioned an end of the compact pole unit, as well as a plunger that may be biased by the contact spring. The circuit breaker also includes an actuator positioned at the end of the pole unit that is opposite the coupler assembly. The circuit breaker also may include a second actuator that is will be connected to the contact spring of the coupler assembly via the plunger, and if so the breaker may be operated via either actuator.