370results about "Switch operated by current/voltage unbalance" patented technology

An arc fault circuit breaker (10) conducting an electric current to a protected load is presented. The circuit breaker (10) has a first (mechanical) compartment (24) and a second (electrical) compartment (62). A bimetal resistor (50) is disposed within the first compartment (24) and conducts the current therethrough. The bimetal resistor (50) has a stud (56) extending into the second compartment (62). A single sense line (60) is electrically connected to the bimetal resistor (50) and routed into the second compartment (62). The sense line (60) and said stud (56) conduct a voltage signal indicative of arcing of the current. A circuit board (84) is disposed within the second compartment (62) and is connected to the sense line (60) and stud (56) within the second compartment (62) to process the voltage signal. The circuit board (84) has a first conductive path (104) electrically connected to the stud (56), and a second conductive path (106) electrically connected to the sense line (60). The first and second conductive paths (104,106) run substantially parallel and proximate to each other such that electromagnetic interference of the voltage signal is substantially reduced.

The system makes it possible to monitor various electrical variables by using a simple structure at low cost with ease and with high reliability by a circuit breaker which jointly includes a current transformer to detect current, a transformer to detect voltage, and a zero-phase current transformer to detect leakage current, in addition to the switch controller to perform the basic function of the circuit breaker. Moreover, the system also provides a function to display various measured values, obtained as described above, by a display unit that can be detached and installed separately from the measuring section to display data sent in digital form by data transmission.

A power strip includes a power cord and a plastic casing mounted onto one end of the power cord. A plurality of outlets are disposed in the casing in a side-by-side relationship. A ground fault circuit interrupter (GFCI) is disposed in the casing and electrically connects the power cord to each of the plurality of outlets. The GFCI is self-contained and modular in form and comprises an outlet-free housing and GFCI circuitry disposed within the outlet-free housing. The GFCI circuitry includes an indicator light, a test button and a reset button which fittingly protrude through corresponding openings formed in both the outlet-free housing and the insulated casing. In use, power cord delivers current to each of the plurality of outlets. However, GFCI serves to interrupt the flow of current from the power cord to each of the plurality of outlets upon detecting a ground fault condition in the power cord.

A grounding fault circuit interrupter (GFCI), including a housing, a trip means, a pair of static contact pieces fixed on the housing, a pair of load contact pieces fixed on the housing, a pair of slide frames, a pair of movable contact pieces fixed on the slide frames respectively, which is resiliently movable, said trip means including a trip coil, a plunger provided in the trip coil, a trip spring abutted against the plunger, a balance frame, a latch, a reset pull rod, wherein said plunger is provided with an annular groove, the plunger movably connected to the latch through the annular groove, wherein the latch has an arc-shaped opening thereon and is movably provided on the balance frame, said balance frame having two wedge sides, the wedge sides in contact with the slide frames; wherein when the reset pull rod is connected with the latch, the static contact pieces are in contact with the movable contact pieces. The grounding fault circuit interrupter has a reverse wiring protection function, the receptacle inlet openings in the face portion of which will not be energized when it's reverse wired.

The invention discloses a leakage circuit breaker which has a simple and small structure of a test circuit and can simultaneously perform accurate leakage tests. As a power supply circuit for supplying power to the leakage detection circuit in the leakage circuit breaker, a power supply circuit with a constant current circuit that converts the AC current supplied from the main circuit into a DC current and supplies a constant DC current to the leakage detection circuit is used, and the test resistance The elements are arranged in series in the circuit connecting the main circuit and the AC input end of the current stabilizing circuit, and the test coil of the zero-phase converter is connected to both ends of the resistance element through a test switch to form a leakage test circuit.

The invention discloses a dynamic type leakage circuit breaker, which comprises a leakage circuit breaker main body which is provided with an operation handle and a dynamic type drive mechanism which is used for driving the operation handle. The dynamic type drive mechanism comprises a motor, an eccentric wheel and a buffer type drive rod component, and the eccentric wheel is arranged on an output shaft of the motor; one end of the buffer type drive rod component is connected with the eccentric wheel, and the other end is connected with the operation handle. The invention has the advantages of simple structure and lower cost, and overcomes the defect that the operation handle of a traditional dynamic type leakage circuit breaker is damaged because of excessive force.

A leakage current detection interrupter with fire protection means comprising: (i) a movable assembly housing; (ii) two fixed contact holders each having a fixed contact point; (iii) ) two movable contact holders each having a fixed end and a movable end with a movable contact point; (iv) a movable assembly that moves between a first position and a second position; (v) a resetting component; (vi) a resetting component spring; (vii) an electromagnetic tripping component, which, when energized, which is responsive to a fault condition, causes the movable assembly to be in the second position from the first position; (viii) an leakage current protection circuit assembled on a printed circuit board for detecting the fault condition; and (ix) a set of three electrical wires: a first wire, a second wire, and a third wire to an appliance, wherein the first wire and the second wire are protected by a plurality of protective shields.

This invention relates to a control device for digital-controlling and protecting switch appliances, in which, the primary module includes a microprocessor, an on-line programming circuit, a current detecting module includes signal collectng and regulating circuit of a current signal and zero-sequence current signal, a parameter setting input module includes setting of potentiometer, setting of DIP dialing and selecting switch and a key switch, an output drive module includes outputting solid relay drive control, an output display module includes a diode display circuit, and the current signals of the current mutual-inductor and that of the zero-sequence current mutual-inductor are rectified and filtered to be sent to the microprocessor for AD conversion to compute current value, the parameter setting circuit sets the parameter signal and sends it to the microprocessor to be stored and analyzes the collected signals to judge the state of the load and fault to cut the primary circuit by outputting the drive control circuit, the software of the control device includes a primary process and the combination of related sub-process and hardware.

The invention discloses a phase-line and neutral-line type residual current action breaker, which comprises an insulating shell. The insulating shell is divided into two adjacent parts by a clapboard and comprises a breaker phase pole of the first part and a leakage protection pole of the second part. The invention is mainly characterized in that a neutral-line circuit and a leakage protection device are arranged in the same plane, and the on and the off of a movable contact of a neutral pole are controlled by a phase pole operation mechanism, therefore, the electric connection process is simple, the length of a neutral line electric loop is shortened, the operation power loss of the product is reduced and the structure is more reasonable. Meanwhile, the movable contact of the neutral pole is mechanically coupled with the phase pole operation mechanism through a drive rod, so that the movable contact of the phase pole and the movable contact of the neutral pole are cooperatively acted, and the movable contact of the neutral pole is closed first and then cut off with simple structure.

A current sensing module is provided for contactors and similar switch gear. The current sensing module is packaged so as to be capable of mounting on a line or a load side of a contactor. The current sensing module may be eliminated where current signals are not needed, but can be added to the package where monitoring and control functions may benefit from sensed current signals on either or both sides of a contactor. The current sensing module may be configured as a single or multiple-phase device, and may output either analog or digital signals to local devices or to networked devices.

The present invention discloses a power plug providing leakage protection comprising a casing, reset button and test button provided to the surface of the top of the casing; wherein movable springs respectively connected to power supply live wire and neutral wire pins are fixedly provided to the bottom part of a circuit board, movable contact points have separate electrical connections with free ends of the movable springs, stationary contact points corresponding to the movable contact points are provided to the circuit board and connected to a loading power supply cable; and a tripping device capable of contacting or disconnecting the movable and stationary contact points is provided inside the casing. The present invention is safe; has strong protective performance, simple structure, and reasonable design, and is safe, suited for mass production, and able to detect a power cable leakage failure and promptly sever the loaded connection with the power supply.

The invention relates to a swinging-arm three-pole on-off device of an earth leakage protective socket, which belongs to the technical field of protective devices of low-voltage electrical apparatus, and comprises a base, a contact mechanism which is formed by a ground wire contact pair, a live conductor contact pair and a neutral conductor contact pair, a circuit board, an electromagnetic trip drive mechanism, a trip mechanism and a reset push button. The invention is characterized by further comprising a swing frame which is arranged on the base, the swing frame is connected with the trip mechanism, and one side of one end of the swing frame is corresponding to and matched with the live conductor contact, and the other side is corresponding to and matched with the neutral conductor contactor, and the middle portion of the other end of the swing arm is corresponding to and matched with a ground wire contact. The invention has the advantages that the swinging-arm three-pole on-off device can achieve the interlocked closing and disconnecting of a ground wire, a live conductor and a neutral conductor, and the ground wire contact can be closed before the live conductor contact and the neutral conductor contact when in closing, and the live conductor contact and the neutral conductor contact are disconnected before the ground wire contact when in breaking, and the swinging-arm three-pole on-off device is beneficial for fully playing the function of protecting electric apparatus and personal safety.

The system makes it possible to monitor various electrical variables by using a simple structure at low cost with ease and with high reliability by a circuit breaker which jointly includes a current transformer to detect current, a transformer to detect voltage, and a zero-phase current transformer to detect leakage current, in addition to the switch controller to perform the basic function of the circuit breaker. Moreover, the system also provides a function to display various measured values, obtained as described above, by a display unit that can be detached and installed separately from the measuring section to display data sent in digital form by data transmission.

Disclosed is a display device for a thermal magnetic type molded case circuit breaker capable to display a phase deficiency occurred on a line to a user such that the user rapidly deals with the phase deficiency and prevents loss caused by over-heating generated due to the phase deficiency. The thermal magnetic type molded case circuit breaker has a bimetal, which is bendable when heat is applied thereto, and a shifter coupled to an upper end of the bimetal and horizontally moved corresponding to a bending degree of the bimetal when over-current is applied thereto. The display device includes a power source for supplying electric power, a display for displaying the phase deficiency of the thermal magnetic type molded case circuit breaker by receiving power from the power source, a stationary contactor electrically connected to the power source and having a stationary contact, and a movable contactor electrically connected to the display and having a movable contact. The movable contactor vertically moves and forms a circuit together with the power source section and the display for displaying the phase deficiency state when the movable contact contacts with the stationary contact. A interlock lever rotates according to a horizontal movement of the shifter. A connection bar makes contact with both shifter and interlock lever so as to transfer horizontal moving force of the shifter to the interlock lever. A latch lever is installed adjacent to the interlock lever in order to restrict a movement of the movable contactor when normal current is applied and to release a restriction of the movable contactor when the phase deficiency occurs.

The invention discloses a novel earth leakage protection socket which is characterized in that the output terminals of a live conductor and a zero conductor of a power source are respectively providedwith two static contacts; two springs are sleeved on a reset guide pole, wherein one spring is a reset spring, and the other spring is a fast trip spring; and an analog leakage current generating switch and a reset start switch are arranged below a release. The invention has the advantages of long service life and stable, reliable and safe operation and has the functions of automatically detecting end of life and preventing lighting strike.

The invention discloses a low-voltage intelligent circuit breaker which comprises a shell; the shell comprises a left end closure, a right end closure and at least one standard middle module which are connected into a whole body by rivets / screws; a main circuit board and a control circuit board are arranged in the inner chamber of the shell; an electric current mutual inductor, a voltage mutual inductor and a zero sequence mutual inductor, a temperature sensor, an energy-storage capacitor, an electromagnetic switch and a Hall sensor are arranged on the main circuit board, wherein the Hall sensor is arranged on the electromagnetic switch; a MCU (microprogrammed control unit) processor and a communication socket are arranged on the control circuit board; an operating button and a red and a green indicator lights are arranged at the obverse side of the shell; power input / output binding posts are respectively embedded in the middle parts of the upper side surface and the lower side surface of the shell; and standard communication sockets, which are connected with the control circuit board, are respectively fixed on the left end closure and the right end closure. The low-voltage intelligent circuit breaker has the advantages of small volume, compact structure, reliability for fixation, standardized and modular design, and convenience for use and install and the complete intellectualization of digital protection, automatic control and communication functions are really implementated.

The invention provides a miniature circuit breaker with a current leakage protector, which mainly solves the problem that the traditional miniature circuit breaker with the function of current leakage protection cannot be separated, and is characterized in that: a steel wire (9) is arranged in a short circuit driver (5) in a penetrating manner, and is connected with a cover plate (10) of a wiringterminal; a shell of the circuit breaker is connected with a shell of the current leakage protector in a clamping manner; an abutment lead wire (14) stretches out of the shell of the current leakage protector, and corresponds to an output terminal (17) of the circuit breaker; and an iron core (18) in a current leakage driver (12) corresponds to the cover plate (10) of the wiring terminal. The miniature circuit breaker with the current leakage protector can be separated, and is flexible and convenient.

The aircraft applicable current imbalance detection and circuit interrupter interrupts an electrical circuit when a current imbalance is sensed. The current imbalance detection and circuit interrupter includes a housing, power supplies, a sensor system for sensing a current imbalance at the line side of the electrical circuit, a logic controller and a power controller including a power relay having contacts capable of surviving carry-break and make-carry-break types of ground fault conditions at anticipated current levels. At power up, the device performs a test to confirm that none of the relay contacts have failed in a closed position, and to check whether a switching FET which controls the relay coil has shorted.

It is difficult to increase consumption current of a bus-powered USB device. In order to solve this problem, a conversion cable for a DC connector and a USB connector is adopted in a USB device provided with a USB cable and a DC connector; a state in which power supply voltage is supplied to two sets of USB cables is detected; and a transistor power supply switch is turned on with a logical product thereof. An identification circuit which raises the potential of ground is incorporated in a USB conversion cable to be distinguished from an AC adaptor. When the AC adaptor is connected, the USB device operates as a self-powered USB device.

The detection transformer which is used with excitation and processing units is toroidal and contains the protected conductors. The transformer magnetic circuit is based on iron with crystals which do not exceed 100 nanometers in thickness and has a static or low frequency magnetic cycle (21) which is virtually rectangular. The coercive force (Hc) in the magnetic cycle is preferably less than 1.5 Amperes / meter. An Independent claim is also included for a differential protection equipment which uses the detection transformer and magnetic circuit.

The invention relates to a socket ground fault line circuit breaker, in particular to a GFCI with fault indicating function, which comprises a shell, a reset key, a test key, a ground assembly, a power inputting connection assembly and a loaded connection assembly, a leakage signal detecting circuit, an alarming circuit and an electromagnetic tripping mechanism. The circuit breaker is equipped with an independent electromagnetic tripping coil, a reset coil and an electromagnetic reset mechanism, the circuit breaker is also equipped with a reset self-locking mechanism gangly controlled and relieved by the reset coil. The reset coil is in series connection with an electronic switch and a resistance-capacitance parallel circuit and is connected to the two ends of the commutated direct current source to form a reset control circuit to control the electromagnetic reset mechanism, and the circuit breaker is also equipped with a reset self-locking mechanism gangly controlled and relieved by a tripping iron core. By remote line-controlling or wireless remote controlling the open of the electronic switch, the socket ground fault line circuit breaker of the invention can communicate the power of the reset coil to actuate the electromagnetic reset mechanism, and the reset self-locking mechanism self-locks and stops the reset frame to finish reset process.

The invention discloses a back-up protection tripping device of electronic type molded case circuit breaker, which is mainly applied to B phase super current short circuit protection for electronic type molded case circuit breaker. The back-up protection tripping device comprises a breaker manipulator, a connecting rod and a back-up protection tripper; the breaker manipulator is provided with a drag bar; the connecting rod is arranged between the drag bar and an armature to be hinged on the breaker manipulator, two ends of the connecting rod are respectively buckled with the armature and the drag bar, thus avoiding the back-up protection tripper applied on B phase in the invention to be in the same line with the existing back-up protection trippers on A phase and C phase, namely, the back-up protection tripper on B phase is arranged in stagger way with the back-up protection trippers on A phase and C phase, thus avoiding interference of the breaker manipulator and leaving space for installation of the back-up protection tripper on B phase; therefore, while A phase and C phase are provided with back-up short circuit protection, back-up short circuit protection of B phase can be realized.

Abstract of Disclosure A method and apparatus for a circuit breaker having an arc fault detection circuit, a ground fault detection circuit, a signal indicative of an arc fault in a corresponding pole of the circuit breaker; and a trip mechanism including a pair of separable contacts. The trip mechanism is in operable communication with the ground fault detection circuitry so that in response to receiving the signal from the ground fault detection circuitry, the arc fault detection circuitry causes the ground fault detection circuitry to generate a trip signal causing the trip mechanism to separate the pair of separable contacts.

A protection socket of electric leakage is prepared as adding a pair of elastic metal plates connected with power supply output end on socket circuit board, setting a pair of active contactors on said metal plates and two pairs of static contactors on power supply output conductor, setting two pairs of static contactors on power supply output conductor to correspond separately to active contactors on power supply input metal and elastic metal sheets for forming two sets of four pairs of switches and adding life-end detection circuit on said circuit board for reminding user timely to replace said protection socket when service life time of said protection socket is ended.

Soft magnetic alloy of the iron-nickel type, the chemical composition of which comprises, by weight: 40%<=Ni+Co<=65%; 0%<=Co<=7%; 2%<=Cr<=5%; 1%<=Ti<=3%; 0%<=Al<=0.5%; 0%<=Mn+Si<=2%; optionally, up to 3% Mo, 2% W, 2% V, 1.5% Nb, 1% Ta and 3% Cu, the sum of the Cr, Mo, W, V, Nb, Ta and Cu contents being less than 7% and the sum of the Mo, W, V, Nb, Ta and Cu contents being less than 4%; the balance being iron and impurities, such as carbon, sulfur and phosphorus, resulting from the smelting process, the chemical composition furthermore satisfying the relationships: Cr<5-0.015x(Ni+Co-52.5)2, if: Ni+Co<=52.5; Cr<5-0.040x(Ni+Co-52.5)2, if: Ni+Co>=52.5; the alloy having a saturation induction Bs of greater than 0.9 tesla, a coercive field of less than 10 A / m, an electrical resistivity p of greater than 60 muOMEGA.cm and a hardness of greater than 200 HV. Process for manufacturing the alloy and uses.

The present invention relates to an intelligent type control and control device of protection switch electric equipment. It includes the following several portions: main body module, current detection module, power supply module and HMI module. It is characterized by that it also includes main program software. The described main body module includes voltage signal input module, current sensor, zero sequence current sensor, optical isolation digital quantity input module, signal conditioning circuit, central microprocessor, output module, temperature protection module, 4-20 mA analog output module and Modbus communication interface. Said invention also provides its working principle and concrete operation method.