Abstract: A multi-button lamp power supply or controller, comprising a shell and a circuit board arranged in the shell, and further comprising: a first mode switching component, wherein one end of the first mode switching component fits with the shell, and the other end of the first mode switching component is positioned inside the shell and fits with the circuit board; and a second mode switching component, wherein one end of the second mode switching component fits with the shell, and the other end of the second mode switching component is positioned inside the shell and fits with the circuit board. The utility model has the advantages of simple operation.

Abstract: An electro-mechanical energy harvesting switch configured to provide at least two different control signals comprises: a generator activating member (9) configured to move between a rest position and a maximum loaded position; at least one spring (11, 13) configured to force the generator activating member towards the rest position; and a unidirectionally rotating protrusion member (17) comprising at least one protrusion (21) configured to move through a protrusion's path during rotation of the protrusion member (17), through a first position of the protrusion (21), in which first position the protrusion (21) is engaged with the generator activating member (9) in the rest position, and through a second position, the protrusion (21) thereby carrying the generator activating member (9) from the rest position to the maximum loaded position against the force of the at least one spring (11, 13).

Abstract: Disclosed are various embodiments of lock devices, systems, and methods. A lock of the application can include an internal mechanism to permit backdriven operation and lost motion operation. In one form the lock can be made from an assembly of parts that have locating features that require one way installation/assembly. The lock can include an internal power source capable of driving electronics used to determine handedness of a door.

Abstract: Disclosed are various embodiments of lock devices, systems, and methods. A lock of the application can include an internal mechanism to permit backdriven operation and lost motion operation. In one form the lock can be made from an assembly of parts that have locating features that require one way installation/assembly. The lock can include an internal power source capable of driving electronics used to determine handedness of a door.

Abstract: A switch is provided. The switch includes a control chip and a trigger device. The trigger device is coupled to a first pin of the control chip. When a user uses the trigger to generate a first control signal, and the control chip detects the first control signal via the first pin, the control chip switches the operating mode of the switch to a managed mode from an unmanaged mode according to the first control signal.

Abstract: An electro-mechanical energy harvesting switch configured to provide at least two different control signals comprises: a generator activating member (9) configured to move between a rest position and a maximum loaded position; at least one spring (11, 13) configured to force the generator activating member towards the rest position; and a unidirectionally rotating protrusion member (17) comprising at least one protrusion (21) configured to move through a protrusion's path during rotation of the protrusion member (17), through a first position of the protrusion (21), in which first position the protrusion (21) is engaged with the generator activating member (9) in the rest position, and through a second position, the protrusion (21) thereby carrying the generator activating member (9) from the rest position to the maximum loaded position against the force of the at least one spring (11, 13).

Abstract: An action output device for a micro breaker, connecting with more than one micro breaker, includes: a shell, the shell comprises: a motor, which is for outputting a torque; an action unit, which is for achieving switching the micro breaker on and off, comprising a rotating part, a poking part, and a linking piece, wherein, the torque outputted by the motor is got by the rotating part; the linking piece is drove to swing by the poking part; the linking piece is connected with an action mechanism of the micro breaker for driving to switch on and off; and a control unit, which controls the motor turning on and off.

Abstract: An induction generator, for a wireless switch, having a magnetic element with north pole and south pole contact sections, and a coil core having pole contact sections, which can contact with the north pole contact section and the south pole contact section. The magnetic element and the coil core are disposed so as to be movable relative to one another so that a reversal of the magnetic flux direction in the coil core can be generated when switching between first and second idle position, which define a direction of relative movement, in which the north pole and the south pole contact sections each contacts the respective associated pole contact sections. The induction generator has a magnetizable sliding contact section for sliding guidance of the relative movement between the coil core and magnetic element, and this sliding contact section extends parallel to the direction of movement.

Abstract: A remote control device may be configured to be mounted over the toggle actuator of a light switch and to control a load control device via wireless communication. The remote control device may include a base portion and a rotating portion supported by the base portion so as to be rotatable about the base portion. The remote control device may include a control circuit and a wireless communication circuit. The control circuit may be operably coupled to the rotating portion and to the wireless communication circuit. The control circuit may be configured to translate a force applied to the rotating portion of the remote control device into a control signal and to cause the communication circuit to transmit the control signal to the load control device.

Abstract: An integrated exciter-igniter architecture is disclosed that integrates compact, direct-mounted exciter electronics with an aerospace designed igniter to reduce overall ignition system complexity. The integrated exciter-igniter unit hermetically seals exciter electronics within a stainless steel enclosure or housing. The stainless enclosure enables the exciter electronics to remain near atmospheric pressure while the unit is exposed to vacuum conditions. The exciter electronics include a DC-DC converter, timing circuitry, custom-designed PCBs, a custom-designed main power transformer, and a high voltage ignition coil. All of which are packaged together in the stainless steel enclosure. The integrated exciter-igniter unit allows for efficient energy delivery to the spark gap and eliminates the need for a high voltage cable to distribute the high voltage, high energy pulses.

Abstract: A method for determining the closing time of an electromagnetic fuel injector including the steps of applying at a starting time of the injection a positive voltage to the coil of the electromagnetic actuator in order to circulate through the coil an electric current which causes the opening of an injection valve; applying at an ending time of the injection a negative voltage to the coil in order to annul the electric current flowing through the coil; detecting the trend over time of the voltage across the coil after the annulment of the electric current flowing through the coil; identifying a perturbation of the voltage across the coil; and recognizing the closing time of the injector that coincides with the time of the perturbation of the voltage.

Abstract: A safety switching device for the failsafe shutdown of an electrical load has at least one input circuit for receiving an input signal from a signaling device which signals a safety-related state, an evaluation and control unit for evaluating the input signal, and at least one output circuit for outputting an output signal. The safety switching device further has at least one switching element for interrupting a current supply path to the load in dependence on the input signal. The input circuit and the output circuit are joined at a device connector so that the device connector can selectively be used as an input for receiving the input signal or as an output for outputting the output signal. The input circuit has a test switch which is coupled to the evaluation and control unit which is designed for selectively suppressing the input signal using the test switch.

Abstract: A Medium Voltage Circuit Breaker that has at least a pair of contact mutually coupleable and uncoupleable to carry out an opening/closing operation, a magnetic actuator operatively connected to at least one of the contacts, and a capacitor bank that has one or more capacitors that deliver power to the magnetic actuator for carrying out the opening/closing operation and a control device. The Medium Voltage Circuit Breaker further has a supervisor device of the capacitor bank which measures the Equivalent Series Resistance and/or the Capacitance of the capacitor bank system.

Abstract: A circuit breaker module includes an electrically controlled actuator, such as a DC motor, operable to move a breaker contact between open and closed positions. An actuator power supply circuit coupled to an AC power source is configured to selectively energize the actuator, responsive to an actuation input. A processing circuit is configured to control the actuator power supply circuit to activate the actuator in response to breaker command signals, using the actuation input. The processing circuit is further configured to delay activations of the actuator as needed to enforce a predetermined cooling interval between successive actuations.

Abstract: A switching actuator for controlling the energy supply to at least one electrical consumer (102) with an energy supply input (142), an energy supply output (144), a signal line input (146), a signal line output (148) and an evaluation unit (154), the evaluation unit (154) being adapted to activate or deactivate the energy supply output (144) on the basis of signals input via the signal line input (146).

Abstract: A zero power standby system for controlling electric appliances is able to wait for switch on instructions without any power consumption. This is done by a remote controller (1) transmitting power in the form of an electromagnetic field, light, or audio signal to a power receiving section (2) of a control signal receiving device (13). The power receiving section will then use the received power to force a multi-switch section (7) to connect between a power supply and a control signal receiving section (9) and a control signal processing section (3) and put the appliance into its usual running mode. When a user desires to turn off the electric appliance, the system stops supplying power to the control signal receiving section (9) and the control signal processing section (3) by turning off multi-switch section (7) and putting the electric appliance back to its zero power standby mode (i.e. consuming no power). Therefore, wasting of electrical energy in the standby mode is reduced to zero.

Abstract: An apparatus comprises an enclosure, an electronic switch, and a solar panel. The enclosure is operable to house electronic components and is configured to be explosion proof. The electronic switch is in communication with the enclosure and the solar panel. The solar panel is operable to deliver power to the electronic switch without accumulating charge. The solar panel is further configured to deliver power to the electronic switch without generating any sparks.

Abstract: A power adapter for an electronic device selectively works in different modes according to a working state signal of the electronic device. When the electronic device is powered off or on with a battery in a determined charge state, the power adapter controls a relay to turn off the relay to disconnect power to the electronic device.

Abstract: A vehicle power system includes an electrical power source, an electrical bus, and a contactor electrically connected with the electrical power source and electrical bus. The contactor includes first and second poles, dual plungers each operatively associated with one of the first and second poles, and an electromagnetic coil configured to cause at least one of the dual plungers to move if the coil is energized.

Abstract: An I/O module for an industrial controller provides single terminal outputs that may either sink or source current. This capability is provided through the use of dedicated sourcing and sinking transistors connected to the terminal and controlled by lockout logic ensuring activation of only the appropriate transistor in the correct phasing for sinking or sourcing operation modes.

Abstract: An arrangement for controllably disconnecting a utility power service from a load includes a meter housing, a service switch, an electrically-powered source of motive force, and energy storage device, and a charging circuit. The meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load. The electrically-powered source of motive force is configured to cause the service switch to controllably interrupt the connection between the utility power service and the load. The energy storage device is operably connected to provide power to the electrically-powered source of motive force. The charging circuit is configured to provide charging energy to the energy storage device.

Abstract: An arrangement for controllably disconnecting a utility power service from a load includes a meter housing, a service switch, an electrically-powered source of motive force, and energy storage device, and a charging circuit. The meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load. The electrically-powered source of motive force is configured to cause the service switch to controllably interrupt the connection between the utility power service and the load. The energy storage device is operably connected to provide power to the electrically-powered source of motive force. The charging circuit is configured to provide charging energy to the energy storage device.

Abstract: An apparatus for setting a test mode in a semiconductor integrated circuit includes a test mode control block that generates a coding control signal according to whether or not a control fuse is cut, and a test mode coding block that sets default values of a multi-bit test code in response to the coding control signal.

Abstract: A level shifting circuit, satisfying a requirement of a high tolerated dV/dt level, and a highly reliable inverter circuit, wherein a set pulse signal and a reset pulse signal, both of which are level-shifted to a potential side taking as reference a reference potential of a gate control terminal of a switching terminal, are obtained differentially and integrated, and, in case these pulse signals equal or exceed stipulated integrated values, are transmitted as regular control signals controlling the on/off state.

Abstract: A coupling node for regulating the current flow between two or more drives is described. The coupling node may include an interconnect circuit in communication with the drives for selectively opening the connection between the drives. A sensor circuit in communication with the drives measures one or more electrical properties of the drives or between the drives. A sensor circuit actuates the interconnect circuit in response to the measured electrical property of the two or more drives meeting predetermined criteria. In operation, when an electrical property of the drives, such as the current flowing between the drives, meets a predetermined criteria, such as an short circuit or current overload, as indicated by the sensor circuit, the controller actuates the interconnect circuit to open the connection between the drives.

Abstract: A motor operator for switchgear for use in mains power distribution systems comprising a closed cabinet (5) with an operating shaft (53) protruding there from said operating shaft being rotatable at least between two positions and has a coupling part (2). The motor operator (6,7) comprises a housing mountable on the external surface of the switchgear cabinet. A rotatable connection shaft (51) is connected to an electric motor via a drive mechanism, and has a first coupling part (52) to fit with the coupling part (2) of the switchgear in a non-rotational interlocking manner, and further has a second coupling part (54) extending from the housing to operate the contact of the switch manually and, for which purpose, the motor operator has a release mechanism releasing the connection shaft. The motor and the drive mechanism is designed as an electro-mechanical actuator with a rear mounting (23) for mounting the actuator in the housing of the motor operator and ?.

Abstract: A wall-mountable electrical timer for controlling the delivery of power from an AC power source to an electrical load, such as a lamp or a fan motor, includes: a timer adjustment actuator for selecting a predetermined time period of operation for the load; a toggle actuator for starting the timer, turning off the timer, and placing the timer in a bypass mode of operation; a vertical linear array of light-emitting diode visual indicators for indicating the length of a predetermined time period, the time remaining, and whether the timer is in the bypass mode; a controllably conductive device for regulating the delivery of power from the AC source to the load; and a controller for receiving inputs from the timer adjustment actuator and the toggle actuator, and for transmitting outputs to the visual indicators and the controllably conductive device.

Abstract: A safety controller provides a safety output to a target controlled system such as a magnet contactor based on an input from an input device such as a safety door switch to thereby control operation of machine equipment. Safety output parts serve to transmit a solid-state output as the safety output and a connection output part transmits a connection output to another safety controller. A control part having two CPUs controls the safety output and the connection output according to a program based on the input from the input device. Two or more of such safety controllers are connected through their connecting output parts and the connecting input parts to together form a safety system.

Abstract: A Medium Voltage Circuit Breaker that has at least a pair of contact mutually coupleable and uncoupleable to carry out an opening/closing operation, a magnetic actuator operatively connected to at least one of the contacts, and a capacitor bank that has one or more capacitors that deliver power to the magnetic actuator for carrying out the opening/closing operation and a control device. The Medium Voltage Circuit Breaker further has a supervisor device of the capacitor bank which measures the Equivalent Series Resistance and/or the Capacitance of the capacitor bank system.

Abstract: The switching system for reducing standby power consumed by an electrical device includes a remote control device configured to selectively emit a radio frequency signal and a switching apparatus in electrical communication with a power supply and the electrical device. The switching apparatus includes a passive radio frequency receiver for receiving the emitted radio frequency signal and a switch. The passive radio frequency receiver converts the received radio frequency signal into electrical power. The switch is actuable, in response to the electrical power generated by the passive radio frequency receiver, from an inactive mode. The switch substantially restricts the electrical device consuming standby power from the power supply, to an active mode. The switch allows the electrical device to consume power from the power supply.

Abstract: A method and an apparatus are disclosed for disconnection of a fault current which has occurred in an AC power supply system. A disconnection command which is produced in a protective device is supplied to a synchronization controller in order to open a circuit breaker, in which synchronization controller a command is delayed until the circuit breaker can be opened in synchronism with the power supply system. The method includes monitoring of the disconnection command emitted from the protective device and monitoring a fault-current signal, or a status signal emitted from the circuit breaker, and formation of an emergency disconnection command if the fault-current signal or the status signal is still present following a delay time after emission of the disconnection command, which delay time is greater than a sum of a natural response time of the circuit breaker and a time for quenching of a switching arc produced on opening of the circuit breaker.

Abstract: An electrical switching topology for a hybrid switch provides extremely low losses in both cryogenic and non-cryogenic electronic systems. In this switch having switch modules connected in parallel, switching losses in a first module are separated from conduction losses in the parallel-connected second module. The conduction losses are then further reduced by cryogenically cooling the second module. Since the switching losses of the first module can be absorbed outside a cryogenic container, the switching losses do not add to the cryogenic heat load. In other applications, the switching module operates at lower temperatures to provide higher switching speeds and reduces switching heat generation.

Abstract: A control system for a power distribution system includes electrical operators each of which has an open input, a close input and an operator member adapted to cooperate with a corresponding circuit breaker operating mechanism. Each operator member responds to the corresponding open input to actuate the operating mechanism and open the corresponding circuit breaker, and responds to the corresponding close input to actuate the operating mechanism and close the corresponding circuit breaker. A control circuit includes an input for a normal power source, an input for an emergency power source, open outputs electrically connected to the open inputs of the corresponding electrical operators, and close outputs electrically connected to the close inputs of the corresponding electrical operator. The control circuit delays one or more of the close outputs or inhibits one or more of the close outputs after a transfer switch output switches to the emergency source.

Abstract: An electric device including an electric switch having a plurality of contact members arranged in series to form a plurality of breaking points arranged in series. One of the contact members at each breaking point is movable. A drive is arranged to actuate each movable contact member. The drive is arranged to effect simultaneous movement of the movable contact members. A commutation circuit is connected in parallel with the electric switch. Each contact member constitutes a part of a contact element, which contact elements are arranged in series. The contact elements have conducting and insulating parts. Every second contact element is movable in relation the others so that movement effects a breaking or closing position of the electric switch. The invention also includes a current limiter such as an electric device and also an electric power network provided with such a current limiter.

Abstract: An electronic drive system using a plurality of drive circuits for enabling greater plurality of functions by selectively placing drive signals on the driver outputs at one of two possible polarities. At least one of the enabled functions taking a substantially shorter time for enablement, thereby allowing at least two of the plurality of functions to share a common driver output enabling signal.

Abstract: The present invention comprises a unique starter assembly for a gas discharge lamp. The starter assembly comprises a main current path with a first leg connected to one electrode of a gas discharge lamp, and a second leg connected to a second electrode of the gas discharge lamp. A starting current path is provided between the first and second electrode, and comprises an magnetic switch. The magnetic switch is actuated by an electromagnet controlled by a control circuit. The control unit may be programmed with the start time required for a particular lamp design. In an alternative embodiment, the starter assembly further comprises a radio frequency identification system. The radio frequency identification system includes a gas discharge lamp transponder. The lamp transponder is used to communicate specific lamp information to the control circuit. The control circuit may then modify the start time for that lamp based on this information.

Abstract: An HID single light emitting point lamp tube switching device is provided for switching the lamp tube between a far light position and a near light position. Initially, a strong current coil and a weak current coil are induced at the same time, so that the HID single light emitting point are moved to the second position, and at end of a time period set in the timer, the strong current coil will be interrupted so that only the weak current coil is actuated to maintain the HID single light emitting point in the second position.

Abstract: The invention relates to an electric device comprising an electric switch (3) having a plurality of contact members arranged in series to form a plurality of breaking points arranged in series. One of the contact members at each breaking point is movable. A drive means (9) is arranged to actuate each movable contact member. The drive means (9) is arranged to effect simultaneous movement of the movable contact members. In accordance with this invention a commutation circuit (2) is connected in parallel with the electric switch (3). Each contact member constitutes a part of a contact element, which contact elements are arranged in series. The contact elements have conducting and insulating parts. Every second contact element is movable in relation the others so that moement effects a breaking or closing position of the electric switch. The invention also relates to a current limiter comprising such an electric device and also an electric power network provided with such a current limiter.

Abstract: An actuation and control device for opening and/or closing an electric switchgear which is connected to an electrical network and has at least one fixed contact and at least one movable contact. The actuation and control device includes an actuator operatively connected to the movable contact to supply the energy to perform opening/closing operations. A measuring mechanism detects the voltage and/or the current of at least one of the phases of the network. The actuator includes a motor with position control, which is operatively connected to the movable contact, and an electronic control and power supply unit which receives information from the measuring mechanism and, following an operation command, sends to the motor electrical signals for driving the motor so that the movement of the movable contact is controlled in relation to a predetermined operation time and to the received information.

Abstract: With an auxiliary lock operated by a built-in battery, it is desired to prevent the door from being kept locked even if the battery dies. The auxiliary lock body is provided with first and second voltage detecting means for detecting that the voltage of the battery has lowered to predetermined voltages. If the first voltage detecting means detects that the voltage of the battery has dropped to a predetermined voltage, the fact is alarmed. Then, if the second voltage detecting means detects that the voltage of the battery has dropped further, the actuator is activated to open the lock by pushing down the bolt inside the lock surface before the battery dies, thereby preventing the door from being kept locked even if the battery dies.

Abstract: A microstructure is provided including a base layer underlying a first and second structural plates. Operation of the microstructure is capable of overcoming stiction. Methods of operation include providing an edge of the first structural plate in contact with a contact point. A second structural plate is deflected in a way that overcomes stiction between the first structural plate and the contact point. Such deflection can include providing a prying force to lift the first structural plate or a hammering force to disturb any stiction related forces at the contact point.

Abstract: The present invention relates to a multipolar electromagnetic switching module designed to be connected by line connections (t1, t2, t3) to a main electromagnetic switching device (AP) and by load connections (U, V, W, u, v, w) to at least one motor and having, in a unit (Bo), between said connections, several load paths fitted with switching poles whose contacts are always alternately closed and controlled by a switching electromagnet (EI) driven by a control circuit, each of the switching poles (C1, C2, C3) consisting of a movable contact holder (Pc) between two conductors (Cf1, Cf2) bearing fixed contacts characterized in that, for each pole, the movable contact holder (Pc) comprises two parallel loop-shaped conductors (Cm1, Cm2) connected to a connection (T1, T2, T3) and that the two fixed contact parts (Cf1, Cf2) are loop-shaped and connected to connections (U, V, W).

Abstract: An electric actuator that is structured simply, low in costs and high in both energy efficiency and operation accuracy and is capable of realizing frequent activation and stop is provided. In a return stroke in which a linear actuator is in low load operation state, an energy generated by an electric motor and a kinetic energy generated by movable portions when they stop are absorbed and accumulated by a coil spring. By this constitution, it becomes possible to cause the movable portions of the linear actuator to quickly stop while eliminating the necessity of giving a braking force by an electric or mechanical brake or the like and of providing a configuration designed for giving a braking force in a reliable manner such as one provided as a measure against heat generation. On the other hand, in an actuation stroke, the energy accumulated in the spring is released as operation energy of the movable portions when the spring extends and a driving force required of the electric motor is reduced.

Abstract: A motor operator for an overhead power switch is disclosed including a microcontroller, a unique and powerful array of well-integrated sensors, a motor and drive developing substantial torque and speed and coupled to a switch actuator and responsive to the microcontroller, and a sophisticated program algorithm stored in memory at the actuator site for dynamically controlling, i.e., governing the various control modes as called for by changing conditions. The sensors include an encoder associated with the motor and drive that develops position information signals fed to the dynamic microcontroller to compute real time information including position, speed, and stopping distance used in conjunction with remote operate commands to open, close and monitor status of the switch in the various ways disclosed.

Abstract: The present invention relates to a multipolar electromagnetic switching module that is connected by line connections (t1, t2, t3) to a main multipolar electromagnetic switching device (AP) and by load connections (U, V, We U′, V′, W′) to at least one motor and having between said connections several power current lines (C1, C2, C3) fitted with switching poles the contacts of which are always alternately closed, and controlled by a switching electromagnet (E2) driven by an electric control circuit (CC), and characterized in that the switching poles (C1, C2, C3) and current lines are arranged to perform a motor control function such as reverser, star-triangle or distributor and in that the pole control assembly consisting of the switching electromagnet (E2) and the control circuit (Cc) is offset relative to the switching poles and load paths in a direction perpendicular to the rear fastening surface (P) of the module such that the width (L) of the module is reduced and more or less identical t

Abstract: A motor operator for an overhead power switch is disclosed including a microcontroller, a unique and powerful array of well-integrated sensors, a motor and drive developing substantial torque and speed and coupled to a switch actuator and responsive to the microcontroller, and a sophisticated program algorithm stored in memory at the actuator site for dynamically controlling, i.e., governing the various control modes as called for by changing conditions. The sensors include an encoder associated with the motor and drive that develops position information signals fed to the dynamic microcontroller to compute real time information including position, speed, and stopping distance used in conjunction with remote operate commands to open, close and monitor status of the switch in the various ways disclosed.

Abstract: A circuit using a single transistor to detect the interface type to Which a combination pointing device is connected. The pointing device may be connected to a PS/2 interface, which generates a voltage greater than or equal to 0 volts, or a serial interface which generates a negative voltage. The transistor is activated when connected to the serial interface, and is inactive when connected to the PS/2 interface. The output of the transistor is sensed by a microcontroller within the pointing device. The microcontroller generates data for transmission to the PS/2 interface if the transistor is not active, and generates data for transmission to the serial interface if the transistor is active. An I/O pin in the microcontroller is used to sense the interface type and can also be used as an output in which the microcontroller generates control signals for use by the pointing device. This multitasking operation reduces the required pin count of the microcontroller, thus reducing cost.

Abstract: A motor-driven step switch for step transformers includes a drive motor connected to the step switch, display, input, and control units, a controller for actuating the drive unit in accordance with rotation direction, an information unit which obtains and transmits the step position and which is connected with the controller which delivers commands for controlling the drive motor and a switching operation, and an electrical connection between the controller and display, input, and control units. In accordance with this invention the information unit has a sensor for determining the absolute value of the actual position of the step switch, a nonvolatile memory unit for storing the position of the step switches with a range of step positions, and a unit for determining an end position of the step switch.

Abstract: The present invention relates to an effector comprising power contacts for power supply of a receiver. The effector comprises an operating mechanism for the power contacts, this mechanism being actuated by an electromagnet. Between a power circuit for supplying power to the receiver and the return power circuit, there is connected a measuring and processing unit arranged to measure the impedance at the terminals of the power supply circuit of the receiver. This unit is coupled to a contact of the control circuit. The contact is arranged to cut the power supply of the control circuit in the event of a short-circuit of the power supply circuit of the receiver.

Abstract: The safety switch assembly is designed to provide a switch assembly to a tool, such as a meat slicer, in order to prevent the operation of the tool without manually holding the pressure sensitive safety handle. The assembly contains a control box having a ground fault interrupter/on-off switch, signal device, a power receptacle and a control circuit. A safety handle is installed on the tool and the handle has two pressure sensitive strips which function as a dual force sensing resistor and is connected to an electric cable that connects the safety handle to the control box which houses the control circuit. The operation of the tool requires that power be supplied to the control box. When the individual grips the safety handle and squeezes the handle, the control box provides power to the tool itself.