337results about "Switch operated by excess currents" patented technology

Electrical fire risks and consumer safety are major concerns driving regulators worldwide to implement more stringent electrical code and enforcement. While there are many commercially available protective devices available, none affords total protection, and they are made and classified only to protect circuits from specific or limited number of faults.

This invention is about an apparatus, system and method for protection of electrical circuits and consumers from literally all known electrical faults in Direct Current (DC) and Alternating Current (AC) single and multi-phase systems such as and including Arc Faults, Ground and Leakage Faults, Surge, Overload, Short Circuit, Glowing Connections, Miswired Connections, overvoltage, undervoltage and Phase-Loss. Said apparatus, system and method come in the form of or in a housing as a Circuit Breaker, Receptacle, Convenience Outlet, Attachment Plug, Equipment Controller, a circuit, or a system integrated with another system, device or apparatus.

The current invention is an automatic AC power interruption system built into a portable power strip or a portable casing or integrated into an appliances control circuitry. The invention monitors the environment for hazard alarms, for example, a T3 signal smoke detector alarm, and responds by tripping open the power supply circuit to the power strip's receptacles and thus interrupts AC power to the protected appliances the user has chosen to plug into them. One alternate form of the invention uses a portable casing that can be plugged into a power receptacle and, when a hazard alarm is detected, trip off the nearest GFCI. Other alternate forms of the invention are integrated within an individual appliance's control circuitry and may interrupt power using a built-in switch or by tripping off the nearest GFCI device. The invention's purpose is to help prevent death, injury, and property damage by preventing fires or facilitating fire suppression; more particularly, by interrupting electrical power to problematic appliances, such as toasters, space heaters, battery chargers, stoves, and motors, when a hazardous condition alarm is emitted. It further interrupts power to the problematic appliances when a detector emits an alarm indicating toxic fumes, natural gas, radon, carbon monoxide, or whatever other detector-alarm the consumer installs in the area to be protected.

A device for de-energizing an energized branch electrical circuit is described, as well as related processes. The device includes a circuit breaker, which itself includes a breaker switch, an input terminal for receiving current, and an output terminal for directing current out of the breaker. A plug is also incorporated into the device, so that the device can be inserted into an electrical receptacle in the branch electric circuit. One or more power indicators, such as an LED light or voltmeter, are also incorporated into the device. When the device is plugged into a receptacle of the branch circuit, the breaker switch can then be turned on, resulting in a short-circuit, which de-energizes the branch electrical circuit. The device may also include a holder, which is capable of retaining at least one electrical adapter.

The present invention relates generally to a circuit breaker. More particularly, the invention encompasses a modular circuit breaker. The present invention is also directed to a novel a modular circuit breaker with a trip bar. The inventive two pole residential circuit breaker includes an Arc Fault and Ground Fault electronic detection system. The modular breaker design includes an electronic system used for tripping a designated mechanism pole which in turn trips the secondary mechanism pole. Electronic components are included that sense the continuous current flow through each mechanism pole simultaneously to determine when a trip event is needed. The electronic system of this invention includes a self diagnostic system with electronic visual indicators that display the method of which trip condition occurred.

The present invention comprises MEMS enabled apparatus for the detection of arc-faults and the elimination of arc-flash conditions. The apparatus comprises an arc-flash detection component and a current limiting component. The current limiting component comprises a logic circuit in communication with the user interface, an MEMS protection circuit in communication with the logic circuit, and a switching circuit in communication with the MEMS protection circuit. The switching circuit comprises a plurality of micro-electromechanical system switching devices and a voltage limiting device, wherein the voltage limiting device is configured to prevent an over voltage event during a current limiting operation.

A circuit breaker includes a first lug and second and third acoustic lugs electrically connected to a power circuit. Separable contacts are electrically connected in series between the first lug and the second acoustic lug. An operating mechanism opens and closes the separable contacts. A first acoustic sensor is coupled to the second acoustic lug and senses a first acoustic signal from the second acoustic lug. A second acoustic sensor is coupled to the third acoustic lug and senses a second acoustic signal from the third acoustic lug. The first and second acoustic signals are operatively associated with a power circuit fault. A current sensor senses a current flowing between the first and second lugs. A circuit inputs the sensed acoustic signals and the sensed current and detects and distinguishes a parallel arc fault or a series arc fault from the sensed acoustic signals and the sensed current.

A thermal overload relay includes an inversion operation mechanism that is driven by a releasing lever to open or close a contact. The inversion operation mechanism includes a movable plate supported at one end so as to be inverted, and a tension spring for driving the movable plate for inversion. The releasing lever presses a middle of a wire of the tension spring to drive the movable plate for inversion. A projection is formed in the middle of the wire of the tension spring to contact with the releasing lever. Thus, a stable inversion operation can be made regardless of the positioning of an adjustment dial.

In a remote controller of a circuit breaker capable of making an maintenance man control a circuit breaker instantly and safely at any place without approaching a certain area such as a control board or a control room, the circuit breaker includes a receiver for receiving a radio control signal for turning on/off or tripping a circuit breaker; a control unit for generating a first control signal or a second control signal depending on the radio control signal inputted from the receiver; a motor driver for controlling the on/off operation of the circuit breaker depending on the first control signal; and a trip unit for tripping the circuit breaker depending on the second control signal.

The present invention provides a direct current circuit breaker and its implementation method, which includes the cutout circuit, the commutation circuit and the energy absorption circuit connected in parallel, wherein the cutout circuit includes cutout inductance and cutout unit connected in series, the commutation circuit includes commutation inductance, commutation unit and mechanical switch connected in series, commutation unit has a smaller on-resistance compared to cutout unit. The direct current circuit breaker topology of the present invention is novelty, concise, fully functional, easy to control and can flexible extend to apply to different voltage occasion. Through using power semiconductor switch module to cut off the current, It will have a quickly action, without generating electric arc, while the modular construction also reduces the consistency requirements of the power electronic component, and easy to realize the voltage-sharing of the power semiconductor in series, the capacitor included in the module also plays a role of limiting the current. Commutation circuit and cutout circuit through the full-bridge structure can realize the shunt, reduce the current stress of the power electronic component, and also reduce the component cost.

Current flowing through a load is monitored by a transformer (Tr1) having a small mutual inductance. The secondary coil is shorted through a rectifier circuit to deliver a charge which, in a first preferred embodiment, is connected to a log charge translator circuit comprising matching diodes (D9, D7 and D10, D8) and a capacitor (C2) to provide a capacitor voltage proportional to the log of the charge delivered through the rectifier circuit. The capacitor is reset after each measurement. In a modified embodiment, the log translator circuit comprises a pair of transistors (T1, T2) and a capacitor (C2). According to the preferred embodiments, two measurements of the capacitor voltage are taken each half cycle at a time determined by the absolute value of the line voltage. The measurements per half cycle are stored in words in a stack and processed through a three or five cycle algorithm for determining fluctuations which will cancel out disturbances caused by nuisance loads that are repetitive or continuously varying. In a described embodiment, a pushdown stack of 60 words is used with fluctuations compared by a microcontroller to a selected limit. Measurements for the last half second of measurements are considered, ignoring the first and last measurement, and when the sum of the fluctuations exceeds the selected limit an arc is indicated and a circuit interrupter is tripped. A self test button is connected to the microcontroller which, when depressed, results in charging of the capacitor to stimulate the detection of an arc.

The invention provides a circuit breaker used in a distribution system, comprising a circuit breaker loop which comprises an overload release, a magnetic release system, a main contact, an auxiliary contact and an operation mechanism, wherein the operation mechanism is used for controlling the closure or cutting off of the main contact and the auxiliary contact under the conditions of the normal working and the overload fault. The circuit breaker also comprises an electronic release accessory loop comprising a selective resistor and an electronic release which are connected in series, wherein the selective resistor and the electronic release are connected with an input circuit part connected to the first electrode of the circuit breaker in series and at least comprising the main contact and the magnetic release system in parallel. Under the condition of a short-circuit fault, the main contact is cut off under the pushing of the magnetic release system so that short-circuit current passes through the auxiliary contact, the selective resistor and the electronic release, the electronic release selectively controls the operation mechanism according to the elimination of the short-circuit fault in the preset delay time, and furthermore, the operation mechanism controls the main contact and the auxiliary contact to carry out corresponding closing or cutting-off operation.

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.