Provided is a method and system that includes a direct current solid state power controller that includes a plurality of switching devices connected in parallel for performing switching, one or more main transient voltage suppressors (TVSs) to perform voltage clamping, a plurality of parasitic inductances each connected in series with a switching device of the plurality of switching devices, and a plurality of local TVSs each connected in parallel with a series connection of a switching device and at least one parasitic inductor of the plurality of parasitic inductances, to dissipate energy stored within the at least one parasitic inductor of the plurality of parasitic inductances.

An electronic protection device (1) for a LV electric line (100) including one or more conductors (P, N), comprising: one or more pairs of electric contacts (2) electrically connectable with corresponding conductors of said electric line and adapted to be mutually coupled or decoupled, said electric contacts being coupled when said protection device is in a closed state and being decoupled when said protection device is in a tripped state or open state; a control unit (3) comprising a controller (31) including data processing resources, said controller being capable of testing the operating conditions of said electronic protection device; a signalling arrangement (7) including one or more signalling devices (71) driven by said controller. Said signalling arrangement comprises a first signalling device (71) adapted to provide light signals (L1, L2, L3) indicative of the operating conditions for said electronic protection device, when said electronic protection device is in a closed state.

A surge suppression circuit for a track circuit is provided. The surge suppression circuit comprises a first surge protection device including a first pair of silicon avalanche diodes and a second surge protection device including a second pair of silicon avalanche diodes. The first surge protection device is connected on a first connection line between a first terminal of a railroad signaling electronic equipment to be protected from a surge and a first terminal of a first rail of two physical rails. The second surge protection device is connected on a second connection line between a second terminal of the railroad signaling electronic equipment and a second terminal of a second rail of the two physical rails. The first surge protection device and the second surge protection device are connected to an earth ground terminal.

A circuit breaker system is disclosed in the present application. The circuit breaker system includes a housing to hold an electrical interrupter within an internal region separated from an external ambient region. The electrical interrupter includes at least a first pair of electrical contact elements that are movable between open and closed positions. A voltage limiter, such as a metal oxide varistor (MOV), is connected across the pair of electrical contact elements to receive and dissipate a transient voltage when the first pair of electrical contacts is moved from a closed position to an open position, thereby reducing undesired arcing and premature wear or erosion of certain electrical components.

A surge protection module configured to limit power surge exposure to an electrical device may include a carrier defining a first end and a second end opposite the first end and a longitudinal axis extending between the first end and the second end. The surge protection module may also include at least two electrical conductors coupled to the carrier. The surge protection module may also include a surge protection component electrically coupled to the at least two electrical conductors and configured to limit power surge conducted to an electrical device to which the at least two electrical conductors are electrically coupled. The carrier may include at least one conductor channel extending between ends of the carrier and configured to receive at least one electrical conductor. The carrier may also define a recess configured to receive at least a portion of a surge protection component, and at least one pocket configured to receive a lug for electrically coupling and for physically coupling a first electrical conductor to a lead of a surge protection component.

A TVS circuit having a first diode with a cathode coupled to a first terminal and an anode coupled to a first node. A second diode has an anode coupled to a second node and a cathode coupled to a third node. A third diode is coupled between the first node and second node. A fourth diode is coupled between the first node and third node. A fifth diode is coupled between the second node and a second terminal. A sixth diode is coupled between the second terminal and the third node. A seventh diode can be coupled between the second terminal and an intermediate node between the fifth diode and sixth diode. The first diode is disposed on a first semiconductor die, while the second diode is disposed on a second semiconductor die. Alternatively, the first diode and second diode are disposed on a single semiconductor die.

A surge protection device includes a surge protection circuit, a controller, and a wireless module. The surge protection circuit has a plurality of surge protection elements, receives a power source and correspondingly generates a sampling signal according to the power source. The controller compares a representative voltage value of the power source corresponding to the sampling signal with a first reference value to determine a using state of the surge protection circuit. The wireless module correspondingly transmits the using state to a remote server.

An overvoltage protection circuit which can be applied to a motor controller is provided. The overvoltage protection circuit comprises a voltage controller, a comparator, and a switching circuit so as to prevent damage to a driving circuit. The driving circuit is configured to supply a driving current to a motor coil.

Systems and methods for RF hazard protection are provided. In one embodiment, a RF protection coupler comprises: a first port to couple to an output of an RF source circuit; a second port to couple to an external RF load; a source side and load side RF switches, wherein the source side RF switch and the load side RF switch are each switch between a first and second states in response to a detected matting. In the first state the source and load side RF switches establish an electrical path between the first and second ports. In the second state: the source side RF switch couples the first port to an impedance load that is impedance matched to the output of the RF source circuit; the load side RF switch couples the second port to an electrical ground; and a gap between the switches electrically isolates the ports.

A lighting relay panel may include lower-cost features or components related to improved safety and reliability. In some cases, the relay panel includes a power supply capable of protecting the panel from high-voltage and high-current transients. A microcontroller may determine a power interruption based on a zero-cross signal received from the power supply, and may also configure latching relays during the interruption. In some implementations, the relay panel includes a relay sense circuit that is capable of receiving actuation signals from multiple relays connected to different phases of a power signal, and the microcontroller may synchronize or repeat the actuations based on a signal from the relay sense circuit. The microcontroller may generate relay addresses based on the relay positions within the relay panel. In some cases, the relay panel may include isolation circuits that are capable of providing an isolated control signal having an improved voltage range.