The disclosure relates to laboratory equipment with flammable refrigerant and connected to at least two different electrical potentials for supplying the equipment with electrical energy. An electrical switch arrangement has first and second switches for electrical separation from, respectively, the first and second potentials. A sequence controller switches on the first switch and thereafter the second switch. A monitoring device is connected via a first contact on the equipment side to the first switch and via a second contact on the mains side to an electrical potential other than the first electrical potential for detecting a switched-on state of the first switch and signaling the detection to the sequence controller. When the monitoring device signals a switched-on state, the sequence controller blocks operation of the equipment as a function of the signaled switched-on state and whether the first switch is expected to be switched on or switched off.

A switch device includes: an operation unit including a first switch, a second switch, a first resistor, a second resistor, and a first terminal; and a control unit including a second terminal coupled to the first terminal. A series circuit of the first switch and the first resistor and a series circuit of the second switch and the second resistor are coupled between the first terminal and a ground. The control unit monitors a potential of the first terminal which changes in response to on/off of the first and second switches via the second terminal, and determines the operation state of each switch based on the potential. A contact of the first switch is configured of a contact in which a resistance value between contacts at the time of opening and closing changes more sharply as compared with a contact of the second switch.

A group-operated switching system for multi-phase electrical transmission lines including a number of inline axial switches for opening and closing circuits to control electrical flow through the transmission lines. The switches include axially mounted load break vacuum interrupters and are mechanically and electrically isolated from each other and from a control box. The control box communicates with the inline switches via RF communications. Power for the switch electronics and operations can be provided from line power, a battery, or a capacitive source.

An electrical disconnecting device comprising a housing, a first terminal lug (4a) inserted into the housing, a second terminal lug (4b) inserted into the housing, a current path forming between the first and second terminal lugs (4a, 4b) in a closed state, a separation point (6) spatially located between the terminal lugs, the separation point (6) disconnecting the current path between the terminal lugs (4a, 4b) in the separated state, a actuator (8) influencing a separation of the separation point (6), a channel formed in the housing between the actuator (8) and the separation point (6), the actuator closing the channel on a side facing away from the separation point, and a connecting element which is arranged on the side of the actuator facing away from the channel and accommodates at least two electrical connections of the actuator, characterized in that the connecting element accommodates at least two contact elements of a switching path, in that the contact elements are each guided into the channel via connecting webs and are short-circuited to one another in the channel at a connecting point in such a way that, when the actuator is triggered, the connecting point is moved away from the contact elements, so that the connecting webs are mechanically disconnected.

The invention relates to a sensor circuit for a device performing a safety function, comprising at least two sensors, at least two comparison circuits, each of the comparison circuits being assigned to one of the sensors, and a linking unit for combining logic states (L=0, L=1) of comparison circuit outputs of the comparison circuits to form a circuit output signal, the sensor circuit being configured to scale the comparison circuit output value of at least a first one of the comparison circuits and to feed it back to a measurement input or a reference input of at least a second one of the comparison circuits so that, when the comparison circuit output of the first comparison circuit transitions between the logic states (L=0, L=1), the difference between the measurement signal and the reference signal of the second comparison circuit is reduced or the sign of the difference between the measurement signal and the reference signal of the second comparison circuit is reversed.

The invention further relates to a device comprising the sensor circuit and a method for processing measurement values from sensors.

A contact wetting circuit 100 is disclosed for supplying wetting current to sense the state of dry contacts of a switch SW1 setting for an electronic device 10. The contact wetting circuit includes an RC circuit 110 having a resistor R1 and a capacitor C1, and a controller 120 connected to a power supply 130 of the device. The controller supplies a first voltage to the RC circuit to produce a charging current having an average current and/or a peak current below the wetting current parameter of the dry contacts. The charging current is used to charge the capacitor C1 during the first time period. The controller stops the supply of the first voltage to the RC circuit after sufficient charging to allow the charged capacitor C1 to supply a second voltage, across the switch SW1, to produce a wetting current. Thereafter, the controller polls and senses the state of the switch SW1, and performs certain operations accordingly.

The invention relates to a space-saving isolating arrester, having for at least two electronic components (EB.sub.1, EB.sub.2) to be monitored, with the electronic components to be monitored being fastened to a carrier (P) using a thermally softenable fixing means, with an energy accumulator (D.sub.1,D.sub.2) being arranged on each of the electronic components which—when a thermally softenable fixing means softens—displaces the associated electronic component substantially parallel to the carrier (P), thereby disconnecting the associated electronic component, and also having a mechanically displaceable display means (ANZ), with the mechanically displaceable display means indicating that one or more of the electronic components to be monitored has been disconnected, and with the mechanically displaceable display means (ANZ) being displaced by a disconnecting electronic component.

Provided is a semiconductor device capable of detecting an abnormal state in which two fuses are both short-circuited or cut. The semiconductor device includes: a trimming circuit having a first fuse and a second fuse connected in series; a current source circuit configured to supply current to the trimming circuit; and a determination circuit configured to determine whether a connection state or disconnect state of the first fuse and the second fuse are abnormal or not based upon signals derived from an output signal of the trimming circuit.

Circuit breaker panels for use in, e.g., residential and light commercial applications. The circuit breaker panels are configured to perform conventional safety functions and are also configured for remote control and monitoring. The circuit breaker panels can be constructed with remote control and monitoring capability, and circuit breaker panels lacking remote control and monitoring capability can be augmented to include remote control and monitoring capability.

An input device comprises a depressible element with two switches including a first switch configured to generate a first signal when the depressible element is depressed by a threshold distance and a second switch configured to generate a second signal indicating when the depressible element is depressed by the threshold distance and the second switch is in an active state. One or more processors may be configured to receive the first signal from the first switch; configure the second switch to change from an inactive state to an active state in response to receiving the first signal; receive the second signal from the second switch in the active state; determine whether the second signal indicates that the depressible element is depressed by the threshold distance; and generate event data confirming that the depressible element is depressed by the threshold distance in response to receiving the second signal.