206results about "Switch operated by excess voltage" patented technology

A system that includes micro-electromechanical system switching circuitry is provided. The system may include a first over-current protection circuitry connected in a parallel circuit with the micro-electromechanical system switching circuitry for suppressing a voltage level across contacts of the micro-electromechanical system switching circuitry during a first switching event, such as a turn-on event. The system may further include a second over-current protection circuitry connected in a parallel circuit with the micro-electromechanical system switching circuitry for suppressing a current flow through the contacts of the micro-electromechanical system switching circuitry during a second switching event, such as a turn-off event.

The invention provides a thermal protection voltage-sensitive resistor module used for surge protection, which consists essentially of a metal oxide voltage-sensitive resistor, a thermal response switch, a set of thruster with a compression spring and a wedge-shaped quencher and a case. Thermal coupling exists between the thermal response switch and the metal oxide voltage-sensitive resistor. When the metal oxide voltage-sensitive resistor is overstressed, the resistor emits heat, the thermal response switch can immediately sense the heat and soften the welding point of solder with low melting point, then the welding point is forced to be quickly disconnected and part of the wedge-shaped quencher is inserted into the clearance at the breakage place of the welding point under the joint effect of the thruster with the spring and the wedge-shaped quencher and the resilient conductive connection arm, thus the quenching effect is enhanced.

A time-synchronized trip implementation for a motor circuit protector (MCP) having a reconfigurable microcontroller. The microcontroller causes a power supply to, be charged for an initial time period during a charging mode. An onboard comparator is configured for a predetermined self-protection level of the MCP, and fault currents that exceed the comparator's threshold will directly drive a solenoid to trip the MCP. The microcontroller reconfigures the comparator's threshold to both measure and charge the power supply toward a stored energy trip voltage, which will charge quickly when high fault currents are present. As a result, self-protection is not compromised. After the trip voltage is reached, the microcontroller reconfigures the onboard comparator's threshold for self-protection trip levels. When a trip event occurs in this mode, stored energy trip activation occurs. The MCP includes user-selectable trip settings, and the microcontroller reconfigures the comparator threshold levels for user-selectable self-protection levels.

The CROWBAR switch includes the insulation shell body as well as up electrode and low electrode inside the shell body. The up and low electrodes constitute main discharging gap. Pressure inside the airtight shell is 10-2 -- 10-5 Pa. At least one of up and low electrodes is movable electrode. Dielectric material flashing over along surface with trigger electrode being inlaid is setup inside the fixed electrode, or movable electrode, or fixed on one side of the fixed electrode. Discharging gap along surface is constituted between the trigger electrode and the said dielectric material. When the trigger electrode is inlaid on one side of the fixed electrode, insulating material insulates between the trigger electrode and end flange. In vacuum condition and action of trigger pulse, the invention possesses strong capability of releasing charges, very wide voltage working range, high withstanding voltage, very small working voltage, and larger discharge capacity.

The invention discloses a surge protector with a thermal protection device, which comprises a shell, a pedestal arranged in the shell, an over-voltage suppression element arranged on one surface of the pedestal, an elastic separation device arranged on the other surface of the pedestal, and two power supply connectors. The surge protector is characterized in that the elastic separation device comprises a bow member and an extension spring; the bow member comprises a nonconductive bow body part, a conductive bowstring part and an electric arc partition board rotationally arranged on the middle part of the nonconductive bow body part; and a guide groove is formed below an electrode on the other surface of the pedestal, the free end of the electric arc partition board is positioned in the guide groove, the conductive bowstring part is connected with one of the power supply connectors through a flexible conductive wire, and the other electrode of the over-voltage suppression element is connected with the other power supply connector. Compared with the prior art, the surge protector has the advantages of preventing high current from passing through an elastic member, eliminating electric arc when the power supply is cut off, and running reliably.

Provided is a protective element which can be applied to reflow mounting and can ensure good responsiveness to current interruption operation even if the liquid phase point or the solid phase point of solder used is higher than a mounting temperature. A protective element wherein a resilient member (20) is bonded through solder (21) to a second conductor (15) and conduction electrode terminals (16, 17) formed on a predetermined substrate (11) in order to divide a conduction passage into a plurality of current interruption parts. The solder (21) has a liquid phase point higher than the mounting temperature when the protective element is mounted on a protection object apparatus. The resilient member (20) is soldered to the second conductor (15) and the conduction electrode terminals (16, 17) while holding stress of such a degree as the resilient member is separated from at least one of the second conductor (15) and the conduction electrode terminals (16, 17) by being deformed even under such a state where the solder (21) does not melt completely.

A voltage surge protection device comprising a disconnection device with electric contacts said disconnection device comprising a first connecting electrode electrically connected with a first connecting strip, a second connecting electrode electrically connected with a second connecting strip, and a third switching electrode electrically connected to the second connecting strip. The protection device comprises a surge arrestor connected in series with a thermal disconnector between the third movable arc switching electrode and the second connecting strip. Said thermal disconnector comprises at least one fuse element extending between a first and second conducting radial wall of an arc extinguishing chamber, said arc extinguishing chamber comprising at least one conducting separator.

A high-security surge protection device comprises an outer shell, at least one excess voltage protection element, a release device, an arc-control device and a box body. The excess voltage protection element is arranged inside the outer shell, and the release device is used for separating the excess voltage protection element from an alternating current or direct current circuit, or equipment. The arc-control device is used for extinguishing the electric arc generated in the separation process of the excess voltage protection element and the alternating current or direct current circuit, or the equipment. The release device is formed by a pressure spring, a metal spring sheet, a slider and a soft conductor. The arc-control device is formed by an arc-control chute sheet set, a first arc striking sheet, a second arc striking sheet, a rotating block and a torsional spring. The rotating block is of a strip-shaped block, an electric arc reflecting plate is arranged on one end portion of the rotating block, an installation hole is formed in the other end portion of the rotating block, and an arc-control cavity is formed in the position, close to the electric arc reflecting plate, of the rotating block. The arc-control chute sheet set is installed in an arc-control chamber surrounded by the box body and the outer shell. One end of the first arc striking sheet is connected to or close to the left end of the arc-control chute sheet set, and one end of the second arc striking sheet is connected to or close to the right end of the arc-control chute sheet set.

The voltage surge protection device comprises at least one protection module designed to be connected to an electric switchgear apparatus. The protection module comprises at least one protective element for protection against voltage surges and separating means connected to at least one protective element to cause an electrical and/or mechanical separation representative of a fault of a protective element following an increase of temperature and/or electric current. The protection module comprises means for mechanical actuation connected to said separating means and comprising a mechanical control link. The electrical control link is placed in a tripped state representative of a fault of at least one protective element when said separating means have caused a separation.

The invention relates to a compact and tiny multifunctional fire-proof and electric leakage-proof safety plug, which comprises an electromagnetic tripping device and a multifunctional protection auxiliary circuit which are arranged on a substrate. A movable iron core, all the tripping coils sleeved on the movable iron core and a framework are arranged on the substrate, an insulation board is fixedly arranged on the central position of a movable contact plate, and a permanent magnet is fixedly arranged on a position where the insulation board can be sucked with a static iron core on a plug shell. When a load end of the plug has the faults such as overload, over voltage, electricity leakage, short circuit and/or overheating in the plug and the like, the protection circuit controls the tripping device to automatically and rapidly trip to cut off a power supply. When the safety plug normally works, as long as a loop leakage current exceeds 5 to 10mA, the power supply can be cut off within25ms to obviously improve outage speed and sensitivity and have good function of protecting low-current domestic appliances and handheld electric tools. The safety plug is a small-sized fire-proof andelectric leakage-proof protection device having reliable fire proofing performance.

A switching device is provided that includes a switching mechanism unit and a switch drive control circuit. In the switching device, an operating member is maintained in an ON position by the sucking force of a permanent magnet and a yoke, despite the pushing force of a biasing unit, when the permanent magnet is in an ON position. The yoke is magnetized in such a manner as to reduce the magnetic force of the permanent magnet, when a coil wound around the yoke is energized by the switch drive control unit. The operating member and a switching member are moved from the ON position to the OFF position by virtue of the pushing force of the biasing unit, thereby shutting a feed line.

We describe a fault-tolerant power semiconductor switching device control system (100), the control system comprising: a coordinating control system (110); and a plurality of switching device controllers (120) each coupled to said coordinating control system and each configured to control a respective power semiconductor switching device (130); wherein said coordinating control system is configured to send real time switching control data to said switching device controllers to control switching of said power semiconductor switching devices, and to receive real time acknowledgement data from said switching device controllers; wherein a said switching device controller is configured to receive said real time switching control data from said coordinating control system, to control a said power semiconductor switching device responsive to said real time switching control data, and to provide said real time acknowledgement data confirming said switching device control to said coordinating control system; and wherein said coordinating control system is further configured to control further switching of said power semiconductor switching devices responsive to said real time acknowledgement data.

The invention discloses a shunt release capable of detecting abnormal power state, which comprises a shell, and a power-off protection unit and a control circuit positioned in the shell, wherein the power-off protection unit is an electromagnet executing the release action; the control circuit comprises a power line sampling unit, a power supply unit and a state processing unit; the power line sampling unit is used for acquiring semaphore representing the power state of the release from the power line on which the release is arranged; the power supply unit acquires a real-time voltage from the power line and converts the real-time voltage to a stable voltage for supplying power; and the state processing unit sets a reference voltage, and generates a trigger signal to the power-off protection unit when the voltage of the semaphore is higher than the reference voltage, and the power-off protection unit generates the release action.

The invention relates to an overvoltage protection device, comprising at least one surge arrester and one switchgear assembly, which is connected in series to the surge arrester and which can be triggered thermally, wherein the aforementioned components form a structural unit, and the thermal tripping means is arranged in the area of the expected heating up of the surge arrester when overloaded. According to the invention, the thermal tripping unit is configured as a stop element through which operating current or surge current does not flow. In the event of thermal overload, the stop element opens a releasing device of the switchgear assembly, wherein said switchgear assembly has an increased self-extinguishing capacity.

The invention relates to a circuit breaker for protecting an electrical system. The circuit breaker comprises a semiconductor switching element with a first and a second electrical terminal connected to a mains supply line and a control terminal. Such switching element is controlled by enabling/disabling a control signal applied to the control terminal for switching between an open/closed status and a closed/open status for connecting/disconnecting at least one load to/from the supply line. Moreover, the circuit breaker comprises a drive adapted to enable/disable the control signal. The circuit breaker is characterized in that it comprises: - a current limiting circuit operatively associated with the mains supply line configured for sending a first signal to the drive for disabling the control signal switching the switching element from the closed status to the open status subsequent to the detection of a current value indicative of a failure in the system; - a voltage regulator circuit connected to the first and to the second electrical terminal, comprising: dissipation means of an electrical energy stored on the mains supply line subsequent to the switching of the switching element from the closed status to the open status, means for limiting a failure voltage between the first and the second terminal generated by peak values of the failure current . Moreover, the circuit breaker comprises an overheating safety circuit of said first and second electrical terminal caused by a non conforming clamping of the electrical wires connected to such terminals.

A buckle mechanism comprises a female portion and at least one male portion adapted to be received within the cavity of the female portion. The male portion has a base, a central leg with a catch and a locking tab. The locking tab seats in the locking slot when the male portion is inserted into the female portion. There is a center button mechanism mounted in the female portion and having a center push button, a spring connected to the center push button and/or to a spring base and at least one flexible leg connected to the spring base. The flexible leg has a catch that interlocks with the catch on the male portion when the male portion is inserted into the female portion. When the center push button is depressed, the spring compresses and causes the flexible leg to bend and release the catch on the male portion so that the male portion is ejected from the female portion when the locking tab is depressed sufficiently to clear the locking slot.

The invention relates to a device (1) for protecting an electric installation against overvoltage comprising at least one protection component (10) provided with means for connecting to said electric installation, means for disconnecting the protection component (10) therefrom which are movable from a closed position to an open position, thereby forming an interstitial space (11) between the disconnecting and connecting means in such a way that an electric arc is formed therein. The inventive device is characterised in that it is provided with means (50) which approaches said electric arc from at least two different directions in order to reduce the cross-section thereof. Said invention is used for protecting against overvoltage.

The invention discloses a device (11) for the protection of an electrical installation (Ph,N) against voltage surges, comprising at least one piezoresistor (15) and a cutter (12) for cutting the piezoresistor when the short-circuit occurs on the piezoresistor (15). A pole (151) of the piezoresistor (15) is connected with the electrical installation by at least two branches which are mutually connected in parallel and used for distributing the current. The cutter comprises a device (13) which is sensitive to the current traversing one of the branches to disconnect the pole in case of failure of the piezoresistor due to short-circuit. The device may be one or many circuit breakers or fuses. The device has insensitivity to over-intensities of the current up to a certain level. Stronger insensitivity of the cutter on the transient current is ensured by acting on the branch to act on the current part flowing through the piezoresistor.

The present invention refers to a combined device for electrical protection against transient overvoltages and monitoring of an electrical installation, of those used in installations with alternating single-phase or multi-phase current, or direct current, of those formed by cartridges plugged in to a fixed base or formed by a monoblock, both types of devices comprising one or more components for overvoltage protection in each plug-in cartridge or in the monoblock, characterised in that it comprises monitoring means configured so that they continuously measure and process one or several parameters related to the state of the electrical installation and the protective device itself, and connected to said monitoring means a series of indication means configured to indicate one or a combination of output parameters are comprised.