156results about "Switch operated by falling voltage" patented technology

A circuit breaker includes separable contacts, an operating mechanism opening and closing the contacts, a first processor determining an open or closed state of the contacts, and a wireless transceiver transmitting the open or closed state from the first processor and receiving a signal. A first accessory includes a wireless receiver, a second processor and outputs. A second accessory includes a wireless transmitter, a third processor and a circuit generating the signal for or communicating the signal to the third processor, which outputs the signal to the wireless transmitter, which transmits the signal to the wireless transceiver. The first processor receives the signal from the wireless transceiver and causes the mechanism to open or close the contacts. The wireless receiver receives the open or closed state from the wireless transceiver. The second processor receives the open or closed state from the wireless receiver and outputs the same to the outputs.

The invention relates to a tripping device used for receiving a shunt trip signal and cutting off a power supply of an external small breaker. The tripping device comprises a shell, and a tripper (1) and a transmission mechanism which are arranged inside the shell, wherein the tripper (1) comprises a coil, an iron core and a biasing spring; and the transmission mechanism comprises a handle (21), a lever (22), a push rod (23), a lock catch (24) and a tripping lever (25). The transmission mechanism of the tripping device is designed more concisely and reasonably and can achieve the perfect transmission effect; furthermore, the tripping device controls two circuit states through the tripper, well utilizes the weak current of an electronic circuit to control undervoltage and a voltage loss circuit and achieves the effective energy-saving effect.

The reset lever on a circuit breaker undervoltage relay is actuated by translating arcuate movement of a handle arm pin as the circuit breaker handle is moved to the off position into rotation of the reset lever through a complaint interface lever that is stiff enough to actuate the reset lever, but flexible enough to accommodate for overtravel of the handle arm pin when the circuit breaker is reset and for the stackup of tolerances in the operating mechanism.

A circuit breaker comprises a magnetic trip mechanism configured to provide a first mechanical driving force, a low voltage trip mechanism configured to provide a second mechanical driving force, a first micro switch configured to generate and output a first trip signal indicating that the circuit breaker has performed a trip operation due to the occurrence of a fault current on a circuit, a second micro switch configured to generate and output a second trip signal indicating that the circuit breaker has performed a trip operation due to the occurrence of a low voltage on the circuit, a first driving force transmission mechanism configured to transmit the first mechanical driving force from the magnetic trip mechanism to the first micro switch, and a second driving force transmission mechanism configured to transmit the second mechanical driving force from the low voltage trip mechanism to the second micro switch.

Electrically assisted safing of a solenoid linear actuator to provide shock tolerance is provided for a solenoid actuator, the actuator having an armature and at least one electromagnetic inductive coil. A controller, receiving an output from a motion sensor, adjusts an electrical power input to the electromagnetic inductive coil. When the output of the motion sensor indicates onset of an environmental transient exceeding a predetermined threshold of intensity, the controller adjusts the electrical power input such that an electromagnetic field generated by the coil is sufficient to restrain the armature in a desired position during the environmental transient.

An transfer switch having a transfer control provides electric power to a load. The transfer switch includes a power switching device provided with electric power from a first power source, such as a utility power source, and a second power source, such as a generator power source. The transfer control is structured to monitor the second power source, maintain a runtime count of the second power source, and provide an indication of the runtime count, either at the transfer switch or at a location remote from the transfer switch and the second power source.

A trip bar is provided for an electrical switching apparatus, such as a circuit breaker. The circuit breaker includes a housing, an operating mechanism, and a number of accessories installable within the housing. At least one of the accessories has an actuator, such as a stem. The trip bar includes an elongated pivot member having a first end pivotably coupled to the operating mechanism, a second end disposed opposite and distal from the first end, and at least one protrusion extending outwardly from the elongated pivot member between the first and second ends. Such protrusion is actuatable by the stem to pivot the elongated pivot member. A deflecting mechanism, such as a cam surface, is disposed at or about the second end of the elongated pivot member. When such one of the accessories is being installed within the housing, the stem deflects the cam surface to facilitate insertion.

The invention relates to automatic control technical field, in particular to an electric motor protection breaker, which is characterized in which the breaker and a protector are connected and combined into a novel electric motor protection breaker on the base of the prior breaker structure. The protector is provided with a phase power inlet wire terminator, a zero line inlet wire terminator, and a zero line outlet wire terminator, and further provided with a panel. The panel is provided with a current commutation regulation resistance revolving button, a reset button and a function shifting switch, a button escaper transmission dialing pole on the protector is inserted into a breaker button escaping hole. The protector is divided into a three-phase protector and a single-phase protector, thus forming the electric motor three-phase protection breaker and the single-phase protection breaker. The protector has similar shape with the breaker, wherein the guide rail fixing sizes are same. The invention has high accuracy and high stability, thereby being applicable to protection of various electric motors and other devices.

The invention discloses an under-voltage tripper. The under-voltage tripper comprises a pedestal, and is characterized in that a connecting rod, a first torsion spring, a toggle joint, a rocker arm, a second torsion spring, a lock catch, a hopping catch, a jacking rod, a rocker device and a conducting system are arranged in the pedestal, wherein the toggle joint is formed by connecting a manually operated handle and a driving connecting rod; and a striking pin of an electromagnetic relay is contacted with the lock catch. When an under-voltage tripper mechanism of the under-voltage tripper is tripped, an operating mechanism main lever of the under-voltage tripper returns to drive the connecting rod of a linkage mechanism to move, and the connecting rod drives a mechanism of a breaker spliced with the under-voltage tripper to be tripped at the same time; on the contrary, when being tripped, the breaker mechanism drives the connecting rod in the linkage mechanism of the under-voltage tripper to move, and the connecting rod drives the tripping mechanism of the under-voltage tripper to be tripped at the same time, so that linkage between the under-voltage tripper mechanism and the breaker mechanism is realized. The linkage between the under-voltage tripper mechanism and the breaker mechanism is realized, so that one breaker can reliably splice a plurality of trippers.

A tripping device comprises a coil frame, a coil, a plunger, a spring, and an anti-shock device. The coil is fixedly coupled to the coil frame and has a cylindrical channel extending therethrough. The plunger is reciprocatingly received within the cylindrical channel and the spring is structured to bias the plunger within the cylindrical channel. The anti-shock device includes at least one of a number of anti-shock devices structured to eliminate movement of the coil relative to the coil frame and a number of anti-shock devices structured to eliminate movement of the plunger relative to the cylindrical channel. An under-voltage release mechanism comprises a mounting bracket, a tripping device, and an angled support. The mounting bracket includes a first portion and a second portion. The angled support is fixedly coupled to the mounting bracket between the first and second portions and is structured to prevent flexing of the mounting bracket.

A trippable control system for one or more electrical breaker poles, comprises a first link pivotable about a first pivot point between first and second positions; a second link pivotable about a pivot axis for connecting to one or more breaker poles, whereby movement of the first link causes the second link to pivot about the pivot axis between a position for opening and a position for closing the breaker pole(s); and a trip mechanism suitable for releasing the first pivot point and for exerting a movement force on the first link to move the first link between the second and third positions when the first link pivots about a second pivot point. Movement of the first link between the second and third positions causes the second link to pivot about the pivot axis between the position for closing the breaker pole(s) and the position for opening the breaker gear.

A voltage and/or current sensing device for low-, medium- or high voltage switching devices is disclosed as a constructively enhanced measuring device with high performance for use in switching devices. The sensing device can include a first voltage sensing part, a second voltage sensing part and a current sensing part all arranged in a same common single housing separated, from the switching device, in a way that an output wire from the first voltage sensing part, for sensing voltage at an upper terminal of the switching device, is located close to the current sensing part, the output wire being applied with an insulating cover, and mechanically fixed to the current sensor part, and/or the output wire being implemented in an isolation body, and only located near to the current sensing part.

The invention relates to a device for receiving and connecting accessories, in particular for low-voltage automatic switches, said device comprising an integrated wiring support. In particular, the receiving and connecting device (1) has a shaped structure (10) comprising an integrated wiring busbar for electrical connection with said accessory. The forming structure (10) also includes one or more seats (20, 21, 22, 23, 24) for receiving said accessories.

The present invention relates to a low-voltage tripping mechanism of a low-voltage breaker. The tripping mechanism comprises an electromagnetic mechanism housed in front portion of a chamber of a case and an electronic module housed in rear portion of the case; the electromagnetic mechanism comprises an armature, a front yoke, a working coil, a baffle and a rear yoke, characterized in that a permanent magnet is disposed between the rear yoke and the baffle, a closed coil is disposed between the working coil and the baffle, a power storage spring is mounted in the chamber behind the armature with the spring counteracting against the baffle, the circuits of said electronic module comprises a low-voltage detecting circuit, a synthetic signal controlling circuit, a main controlling circuit and a D.C. power supply. It's advantages include such as small volume simple structure, constant holding force, the coil being not overheated in high voltage, the contacts being closed reliably in low voltage, actuating voltage being accurate, power-saving and low noise.

A protection apparatus for a circuit breaker disposed in a circuit to be protected uses a solenoid configured to operate the circuit breaker on command, an undervoltage release (UVR) sensing apparatus configured to produce an UVR signal in response to a line voltage of the circuit to be protected falling below a predetermined level, and a shunt trip (ST) sensing apparatus configured to produce a ST signal when it senses a ST command. A controller operably connected to the UVR sensing apparatus, the ST sensing apparatus, and the solenoid, is configured to receive the UVR and ST signals when produced and controls the solenoid to open the breaker in response to receipt by the controller of either of the UVR and ST signals.

The invention relates to voltage transformer protection technology, specifically to a device for preventing reverse charging of a secondary side of a voltage transformer, and solves the problem that existing voltage transformer protection technology cannot completely prevent a reverse charging phenomenon from occurring in a voltage transformer. The device for preventing reverse charging of the secondary side of the voltage transformer includes a three-phase air switch, a first spring, a lock rod, a support, a lever, a top rod, a bimetallic strip, an electric heating element, a reverse charging release, an overcurrent release, an undervoltage release, and a second spring; a right end of the first spring is fixed to a first phase moving contact of the three-phase air switch; a left part side face of the lock rod is fixed to the first phase moving contact, a second phase moving contact and a third phase moving contact of the three-phase air switch; a right end of the lock rod is provided with a first hook-shaped part; a left end of the lever is provided with a second hook-shaped part which are in a clasp joint with the first hook-shaped part; and a right end of the lever is hinged to the support. The device for preventing reverse charging of the secondary side of the voltage transformer in the invention is suitable for a power grid.

The invention discloses a circuit emergency protection device which comprises a bottom plate extending left and right and a device frame extending left and right at the top end surface of the bottom plate. The bottom plate is symmetrically provided with vertical through screw slots at left and right sides, fixed screws extending up and down are in a thread fit connection with the screw slots, thetop end surface of the device frame is fixedly provided with a rotating shaft frame which is in rotating fit connection with a front and back extending rotating shaft, the rotating shaft is fixedly connected to a left and right extending rotating handle rod, the right end surface of the rotating handle rod is fixedly provided with a stopper, the right end surface of the stopper is fixedly providedwith a left and right extending handle rod, and the bottom of the rotating handle rod is provided with a left and right extending groove with a downward opening. The circuit emergency protection device has the advantages of simple structure and convenient operation, two corresponding protection mechanisms are set according to common open circuit and short circuit conditions in the circuit, and the practicability of the device is improved.

Disclosed is an accessory device for a manual motor starter attached to one side of a body of the manual motor starter so as to perform various accessory functions, such as a forcible trip function for the manual motor starter by remotely switching the manual motor starter or a trip function for the manual motor starter when under-voltage occurs between a power source and load. A remotely switchable trip function and under-voltage trip function are achieved by using one accessory device.

The invention discloses a low-voltage circuit breaker with high voltage phase-lack protection, which comprises a circuit breaker body, wherein the circuit breaker body is fixed with an electrical apparatus release and comprises a high voltage phase-lack protection control module, the control module comprises a low voltage power module for connecting with the secondary side phase line of transformer, a sampling module for picking voltage parameter of the transformer secondary side, an analysis comparative module and an output execution module, the output end of sampling module is connected with the analysis comparative module, the out end of analysis comparative module is connected with the output execution module, the output execution module is connected with the low voltage power, when the data which is picked by the sampling module is judged normal by the analysis comparative module, the trip coil of the output execution module doesn't work so that the electrical apparatus release doesn't work, when the sample picked by the sampling module is lack of phase, the analysis comparative module controls the electrical apparatus release via the trip coin of the output execution module so that the circuit breaker is tripped, the electric circuit is cut and the original side phase-lack protection of the transformer is achieved.