A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit prevents a flow of a line current from a voltage terminal to the electrical load when the line current reaches a first nominal current. The overvoltage protection circuit is connected downstream of the first fuse circuit and upstream of the electrical load, and is adapted to electrically connect two poles of the voltage terminal when a voltage at the voltage terminal reaches a first voltage limit to force the line current to the first nominal current such that the first fuse circuit is triggered. The second fuse circuit is connected downstream of the overvoltage protection circuit and upstream of the electrical load, and prevents flow of the line current when the line current reaches a second nominal current, wherein the second nominal current is based on the electrical load.

A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit interrupts a flow of a line current from a voltage terminal to the electrical load when an intensity of the line current reaches a first current intensity limit value. The overvoltage protection circuit electrically connects poles of the voltage terminal when a first voltage limit value of a voltage is reached on the first fuse circuit to force the line current to reach the first current intensity limit value. The second fuse circuit activates the overvoltage protection circuit when a second voltage limit value of a voltage on the second fuse circuit is reached to electrically connect the poles of the voltage terminal. The second voltage limit value is based at least in part on a nominal voltage of the electrical load.

A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit prevents a flow of a line current from a voltage terminal to the electrical load when the line current reaches a first nominal current. The overvoltage protection circuit is connected downstream of the first fuse circuit and upstream of the electrical load, and is adapted to electrically connect two poles of the voltage terminal when a voltage at the voltage terminal reaches a first voltage limit to force the line current to the first nominal current such that the first fuse circuit is triggered. The second fuse circuit is connected downstream of the overvoltage protection circuit and upstream of the electrical load, and prevents flow of the line current when the line current reaches a second nominal current, wherein the second nominal current is based on the electrical load.

A protective device includes a first fuse circuit, an overvoltage protection circuit, and a second fuse circuit. The first fuse circuit interrupts a flow of a line current from a voltage terminal to the electrical load when an intensity of the line current reaches a first current intensity limit value. The overvoltage protection circuit electrically connects poles of the voltage terminal when a first voltage limit value of a voltage is reached on the first fuse circuit to force the line current to reach the first current intensity limit value. The second fuse circuit activates the overvoltage protection circuit when a second voltage limit value of a voltage on the second fuse circuit is reached to electrically connect the poles of the voltage terminal. The second voltage limit value is based at least in part on a nominal voltage of the electrical load.

The disclosure describes a system for monitoring and mitigating damage to electrical utility structures and the surrounding environment. In some embodiments, the system includes fire boxes, arc sensors, angle switches, and disconnect switches configured to generate alert signals when a hazard is detected. In some embodiments, the system includes cameras configured to detect a hazard such as a fire or moving object. In some embodiments, the system includes light transmitters and light receivers positioned at a predetermined location away from power lines to detect objects that interrupt a line of site. In some embodiments, the system can electrically isolate a power line before a detected hazard impacts a power line.

A temperature control protection device and a corresponding charging device. The temperature control protection device includes: a temperature acquisition unit (101); a comparison unit (102) configured to compare an environment temperature signal with a preset reference voltage and output a first comparison result; a control unit (103) configured to compare the environment temperature signal with a preset threshold and output a second comparison result; a driving unit (104) configured to output a driving signal to a switch unit (105) according to the first comparison result or the second comparison result for switching on or off the switch unit (105); and the switch unit (105) configured to output charging current when being conducted. The temperature control protection device and the charging device with it according to the embodiments of the present disclosure realize the multiple protections of temperature monitoring during charging, and improve the charging safety.

An appliance includes an appliance interface forming a plug connection with an appliance-side interface unit of a power cable. The appliance interface includes at least one power contact part forming a power connection with a power contact part of the appliance-side interface unit supplying the appliance with electrical energy from a supply grid. The appliance interface includes a first thermoelectric element contacting a second thermoelectric element of the appliance-side interface unit, when the power connection exists. The first thermoelectric element is coupled to a first measurement input of a control unit. The appliance interface includes a measurement contact part forming a measurement connection, between the second thermoelectric element and a second measurement input of the control unit, with a measurement contact part of the appliance-side interface unit. The control unit determines measurement data relating to a measurement voltage between the first and second measurement inputs.

An inrush current prevention circuit includes: a voltage detection unit configured to detect a value of an input voltage applied by a power supply; a current detection unit configured to detect a value of an input current input from the power supply; a current limiting element configured to limit the input current; a voltage drop detection unit configured to detect a voltage drop in the power supply resulting from inrush currents using a detection voltage value detected by the voltage detection unit and a detection current value detected by the current detection unit; and a control unit configured to decrease a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop.

The disclosure describes a system for monitoring and mitigating damage to electrical utility structures and the surrounding environment. In some embodiments, the system includes fire boxes, arc sensors, angle switches, and disconnect switches configured to generate alert signals when a hazard is detected. In some embodiments, the system includes cameras configured to detect a hazard such as a fire or moving object. In some embodiments, the system includes light transmitters and light receivers positioned at a predetermined location away from power lines to detect objects that interrupt a line of site. In some embodiments, the system can electrically isolate a power line before a detected hazard impacts a power line.

An inrush current prevention circuit includes: a voltage detection unit configured to detect a value of an input voltage applied by a power supply; a current detection unit configured to detect a value of an input current input from the power supply; a current limiting element configured to limit the input current; a voltage drop detection unit configured to detect a voltage drop in the power supply resulting from inrush currents using a detection voltage value detected by the voltage detection unit and a detection current value detected by the current detection unit; and a control unit configured to decrease a current limiting level of the current limiting element when the voltage drop detection unit detects the voltage drop.