Abstract: A computerized electricity system for connecting loads to a power source, including: (a) an arc fault detecting sub-system having at least one module including: (i) a relay unit, electrically associated with a particular load, for connecting and disconnecting to a power source; (ii) a current sensor for measuring a current being delivered from the power source to the load, to produce a current measurement; (iii) an analog circuit for receiving the current measurement from the current sensor, and for producing an analog signal based on the current measurement, and a second signal for indicating a potential arc fault event, and (iv) a digital circuit for receiving the second signal from the analog circuit and producing data, and (b) a processing unit connected to each module, so as to receive data corresponding to the analog signal, and the data from the digital circuit, the processing unit for identifying the arc faults, and wherein the processing unit is configured to command the relay unit to disconnect the

Abstract: A system for controlling electricity consumption of an electricity consumer having a plurality of loads, including: (a) a main central processing unit, connected to a power source, and adapted to receive a signal therefrom; (b) a memory associated with the processing unit; (c) controlled relay assemblies connected to a plurality of loads via local circuit breakers, each assembly including: (i) a relay, responsive to the processing unit; (ii) a current sensor, electrically connected to the relay, the relay and the current sensor being electrically associated with the processing unit, and (iii) an electrical line having a first end connecting the relay assembly to the power source, and having a second end connecting to a local circuit breaker connected to at least one load; wherein each current sensor is adapted to provide, to the processing unit, data pertaining to current drawn via a particular local circuit breaker, and wherein the processing unit is configured to command the relay based on the signal receiv

Abstract: A computerized electricity system for connecting loads to a power source, including: (a) an arc fault detecting sub-system having at least one module including: (i) a relay unit, electrically associated with a particular load, for connecting and disconnecting to a power source; (ii) a current source for measuring a current being delivered from the power source to the load, to produce a current measurement; (iii) an analog circuit for receiving the current measurement from the current sensor, and for producing an analog signal based on the current measurement, and a second signal for indicating a potential arc fault event, and (iv) a digital circuit for receiving the second signal from the analog circuit and producing data, and (b) a processing unit connected to each module, so as to receive data corresponding to the analog signal, and the data from the digital circuit, the processing unit for identifying the arc faults, and wherein the processing unit is configured to command the relay unit to disconnect the

Abstract: A method and system for transferring a load from a first AC voltage source to a second AC voltage source. A temporary voltage source is connected to the load and to the first voltage source via a resistor. The first voltage source is disconnected from the load. The second voltage source is connected to the load. Finally, the temporary voltage source is disconnected from the load. The temporary voltage source may be independent of the first and second voltage sources, or may obtain voltage from the first or second voltage sources. The connecting and disconnecting is done by mechanical switches, by thyristors, or by mechanical switches and thyristors in parallel or in series.

Abstract: A method and system for transferring a load from a first AC voltage source to a second AC voltage source. A temporary voltage source is connected to the load and to the first voltage source via a resistor. The first voltage source is disconnected from the load. The second voltage source is connected to the load. Finally, the temporary voltage source is disconnected from the load. The temporary voltage source may be independent of the first and second voltage sources, or may obtain voltage from the first or second voltage sources. The connecting and disconnecting is done by mechanical switches, by thyristors, or by mechanical switches and thyristors in parallel or in series.

Abstract: An apparatus for and method of evenly distributing an electrical load across an n-phase power distribution network. The current in each incoming phase and in each branch circuit is measured by a current sensor. The outputs of the current sensors are monitored by a processor. Associated with each branch circuit is a multi-pole switch and a conventional circuit breaker. Each switch is able of connecting its corresponding branch circuit to any incoming phase, and of disconnecting the branch circuit from all n phases. The processor periodically monitors currents flowing through each incoming phase and, based on branch circuit load conditions, reprograms the switches to keep the branch circuit loads evenly distributed across all three incoming phases.

Abstract: An electronic switch circuit for controlling a main circuit including a power source and a load, the electronic switch circuit including (a) an electromagnetic relay device including an electromagnet and at least two contacts, the electromagnetic relay device being connectable in series to the power source and the load of the main circuit; (b) a controlled semiconductor device being a part of the electronic switch circuit; (c) a semiconductor command circuit being connected to the semiconductor device, the semiconductor command circuit serving for controlling the operation of the controlled semiconductor device; (d) a relay command circuit being connected to the electromagnet of the electromagnetic relay device and to the semiconductor command circuit, the relay command circuit serving for controlling the relay device and the semiconductor command circuit; (e) an overload sensor serving for determining a current load flowing through the main circuit and for reporting the relay command circuit of a current ove

Abstract: A control unit for controlling the temperature of a domestic water supply, comprising a temperature sensor for inserting into a water tank so as to produce a sensor signal representative of actual water temperature in a region of the temperature sensor and an electrical immersion heater for inserting into the water tank and energized by a source of electrical power. A setting device is adjusted by a user for setting a desired water temperature and producing a corresponding set signal, and a controllable switch is connected between the source of electrical power and the electrical immersion heater, and is responsive to the sensor signal and to the set signal for closing if the actual water temperature is lower than the desired water temperature and for opening if the actual water temperature is greater than the desired water temperature.