A circuit breaker system is provided; the circuit breaker system comprises of a transformer, a capacitor, a pulse generator, a EBWF fuse and a VCB, the circuit breaker system can interrupt rated load current, overload current, surge load current and short-circuit load current within 100 microseconds. The on-state voltage drop of the circuit breaker system is below 0.1V. The circuit breaker system interrupts load current by injecting a non-resonant pulse current to reduce the current between the contacts of the VCB, and circuit breaker system interrupts higher load current by detonating the EBWF fuse to force an open-circuit. The EBWF fuse comprises a detonator in the low terminal and a contacting bellows in the upper terminal. The EBWF fuse can be engaged and dis-engaged by a fuse holder system.

A circuit breaker system is provided; the circuit breaker system comprises of a transformer, a capacitor, a pulse generator, a EBWF fuse and a VCB, the circuit breaker system can interrupt rated load current, overload current, surge load current and short-circuit load current within 100 microseconds. The on-state voltage drop of the circuit breaker system is below 0.1V. The circuit breaker system interrupts load current by injecting a non-resonant pulse current to reduce the current between the contacts of the VCB, and circuit breaker system interrupts higher load current by detonating the EBWF fuse to force an open-circuit. The EBWF fuse comprises a detonator in the low terminal and a contacting bellows in the upper terminal. The EBWF fuse can be engaged and dis-engaged by a fuse holder system.

A disconnector device including an isolator connected between a first terminal and to a second terminal, and a sleeve positioned around the isolator and moveable between an un-extended position prior to the isolator operating and an extended position after the isolator operates, the sleeve being configured to trap debris produced by operation of the isolator.

A pyrotechnic drive device includes a housing (3) provided with a combustion chamber (5) having pyrotechnic material (15) as well as an activation device (13). The combustion chamber is delimited at least in an initial state on all sides by combustion chamber walls (3, 7, 13, 17, 33, 35) formed in at least one partial region by respective pressure-receiving surface or respective pressure-receiving element (17, 35). Each pressure-receiving impact of a pressure-receiving element (17, 35) is impacted after the activation of the pyrotechnic material (15) in such a way by the gas pressure generated in this manner that the pressure-receiving element (17, 35) is moved and/or deformed (17, 35) and/or a mechanical impulse is thus transmitted via the pressure-receiving element (17, 35) to an element to be driven (19) so that a connected substance (25) is transmitted. The residual volume of the combustion chamber (5), in which no pyrotechnic material (15) is provided in the initial state, is filled with a liquid, a gel-like or pasty filling material (21), and/or a soft, rubber-like material.

A bypass switch for high voltage direct current (HVDC) transmission is provided. The bypass switch includes a housing, a fixed contactor disposed in the housing and electrically connected to a first portion of a HVDC transmission circuit, a movable contactor movably disposed in the housing at a position spaced apart from the fixed contactor and electrically connected to a second portion of the HVDC transmission circuit, an insulation member coupled to a side of the movable contactor, an explosive actuator disposed at one side of the insulation member and exploded according to an electrical signal, and a piston mechanism which is moved by the force of gas generated due to the explosion of the explosive actuator, applies force to move the insulation member, and allows the fixed contactor and movable contactor to be electrically connected to each other.

A bypass switch includes: a casing; a vacuum interrupter disposed inside the casing, the vacuum interrupter being disposed such that a movable contact is movable to a fixed contact; a first fixing bus-bar fixed to the casing; a second fixing bus-bar fixed to the casing to be spaced apart from the first fixing bus-bar; a moving pusher connected to the movable contact; a drive source installed in the casing, the drive source pushing the moving pusher to a position at which the movable contact and the fixed contact are contacted with each other; and a multi-contactor disposed to be contacted with the moving pusher. Accordingly, the moving pusher can rapidly contact the movable contact with the fixed contact. Further, the moving pusher can be moved with a small external force. Thus, it is possible to minimize the size of the drive source and the power used in the drive source.

The invention relates to a device for connecting and disconnecting an electrical load circuit, operated at high voltage by a voltage source, in a transportation means that is electrically driven by a drive operated at low voltage. According to the invention, a contact stud (6) is connected to the push rod (11) of a linear drive (2) and the contact stud (6) can be moved into at least two positions in a switch housing (4), wherein the switch housing (4) has, on its internal wall, at least two contact rings (5), one of which is connected to the voltage source (7) and the other is connected to the consumer circuit (8).

An interrupter device provides overload protection. The device includes a first terminal that is configured to establish an electrical connection to a first terminal of a high voltage surge arrester, a second terminal that is configured to establish an electrical connection to an electrical power grid line side conductor, and a chargeless disconnection trigger that causes an interruption in an electrically conductive path between the first and second terminal in response to an overload condition at the second terminal.

Apparatus for switching an electrical load circuit operated at high voltage are disclosed. The embodiments described herein include a device for controlling the switching of a high voltage circuit such that both the connection and disconnection can be carried out in a simple and reliable manner. Embodiments described herein can also prevent the unintentional opening of the switching device which can greatly extend the service life of the switching circuitry. Moreover, the apparatus disclosed herein reliably prevent the formation of an arc during switching by enabling the switching operation to take place without a load.

A disconnector device including an isolator connected between a first terminal and to a second terminal, and a sleeve positioned around the isolator and moveable between an un-extended position prior to the isolator operating and an extended position after the isolator operates, the sleeve being configured to trap debris produced by operation of the isolator.