An output-switch control system for an AC-DC power supply includes a push-button switch that has two triggers. The triggers correspond to different contacts of a detecting circuit, respectively. When the push-button switch is pressed to make the triggers and the contacts turn into a close-circuit state form an open-circuit state, the detecting circuit outputs a power-source-on signal, and when the push-button switch is pressed again, and either of the triggers and the contact turn into the close-circuit state form the open-circuit state, the detecting circuit outputs a power-source-off signal immediately. With the dual-transition signal certification at the contacts, safe output-switch control can be achieved, so as to provide a user with operational safety.

A power strip having two or more powers strips daisy chained together where each of the two or more power strips include a sequence control module operable to sequentially activate and/or deactivate the outlets, thereby powering up or powering down each outlet separately across the two or more power strips. A pre-determined time delay, that can be set by a user, occurs between the activation and/or deactivation of the outlets. The sequence control module of each power strip is operatively coupled to the sequence control module of the subsequent next power strip so that one power strip can be used to trigger activation of the next power strip.

An electronic circuit arrangement for use in an explosive area may include an electrical signal line, which connects an electrical input connector to an electrical output connector, and an electrical earth line, which can be or is electrically connected to the electrical signal line by at least one electrical earthing line. An inductive component and a semiconductor switch may be arranged in the at least one earthing line. The semiconductor switch may be switched between a closed state, in which the signal line is electrically connected via the at least one earthing line to the earth line, and an open state, in which this electrical connection is interrupted.

Described are devices for automatically adapting electrical polarity from a power source to a specified output polarity for use by an electrical load. In one implementation, power adaptation circuitry comprising one or more bridge circuits accept electrical power of unspecified polarity and output specified polarity. The bridge circuit may comprise a plurality of field-effect transistors (FETs) configured such that a particular subset of the FETs are energized to conduct electric current to the outputs when a particular polarity is applied at inputs.

A rotatable switching member includes a support bracket having a first arm, a second arm, and a middle portion, and a switch flange. The rotatable switching member further includes a switch bracket connected to the middle portion of the support bracket having an attachment portion and an engagement portion. A handle is fixed to the first arm of the support bracket to rotate the rotatable switching member.

A rotatable switching member includes a support bracket having a first arm, a second arm, and a middle portion, and a switch flange. The rotatable switching member further includes a switch bracket connected to the middle portion of the support bracket having an attachment portion and an engagement portion. A handle is fixed to the first arm of the support bracket to rotate the rotatable switching member.

Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker. A second interlock unit is disposed below the circuit breaker and connected to the circuit breaker and the second three-position switch, and is configured to block a manual operation of the second three-position switch in the closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the second three-position switch is manually operated in the open state of the circuit breaker.

A motor control center includes an enclosure comprising an isolation switch, a main contactor device, and a ground switch device. The isolation switch is selectively manually operable between a connected state and a disconnected state. In the connected state the isolation switch is adapted to conduct electrical power from an associated power source to the main contactor device and wherein the isolation switch in the disconnected state interrupts conduction of electrical power from the associated power source to the main contactor device. The main contactor device is selectively operable between a conductive state and a non-conductive state, wherein the main contactor device is adapted to electrically connect the isolation switch to the ground switch device and to an associated electrical load when the main contactor device is in its conductive state and wherein the main contactor device disconnects said isolation switch from the ground switch device and the associated electrical load when the main contactor device is in its non-conductive state. The ground switch device is manually operable from an open, ungrounded state in which the main contactor device is electrically disconnected from a ground path to a closed, grounded state in which the main contactor device is electrically connected to the ground path. The motor control center further includes a first interlock device operably connected between the isolation switch and the ground switch device, wherein the first interlock device prevents movement of the isolation switch from the disconnected state to the connected state when the ground switch device is in the grounded state.

A distribution grounding switch for an electricity distribution network has a first electrical terminal adapted connectable to a mains line, a second electrical terminal connectable to a lateral line, a first vacuum bottle having a pair of contactors therein, a second vacuum bottle having a pair of contactors therein, and a magnetic linkage cooperative with one of the pair of contactors of the first vacuum bottle and one of the pair of contactors of the second vacuum bottle so as to cause the pair of contactors of the first vacuum bottle the close while generally simultaneously causing the pair of contactors of the second vacuum bottle to open. The mechanical linkage also causes the pair of contactors of the first vacuum bottle to open generally simultaneously with the closing of the pair of contactors of the second vacuum bottle.

A bypass switching assembly includes a source terminal configured for connection to an electrical source; a load terminal configured for connection to a load; a switch including: a first electrically conductive element, a second electrically conductive element, and an electrically conductive bypass element; and an interlock assembly including: an insulator configured to rotate; and a locking assembly configured to interact with the insulator to prevent movement or permit movement of at least one of the first electrically conductive element and the second electrically conductive element.