An object is to provide a DC power supply connector that can suppress occurrence of an arc discharge at DC power off with a small-scale configuration without reducing power efficiency during DC power supply and can reduce heat generation. The connector includes, on at least any of a positive-electrode-side electrode side and a negative-electrode-side electrode side, a movable contact piece (20c) that touches a first contact (25) in a state where a terminal (11) on a power receiving side has been inserted and to touch a second contact (24) in a state where the terminal has not been inserted, and a current limiting circuit (30) including a switching element (T1). The current limiting circuit (30) does not flow a current to the switching element (T1) in the case where the movable contact piece (20c) is touching the first contact (25), and flows a current to the terminal (11) through the movable contact piece (20c) until the movable contact piece (20c) is linked to the second contact (24) after separation from the first contact (25), and gradually decreases the flowing current.

An electrical installation includes: a switch cabinet; a protective switch arranged in the switch cabinet; and a cladding having electrical conductors and a voltage-measuring device/current-measuring device for measuring a current flowing through the electrical conductors, the voltage-measuring device/current-measuring device being operatively connected to the protective switch and being capable of triggering or switching off the protective switch when a measured value exceeding a threshold value is detected.

An intelligent control method includes monitoring whether a protected object is within a preset range of a dangerous device. The method includes starting a tracking mode for the protected object when monitoring that the protected object is within the preset range of the dangerous device. The method includes monitoring in real time whether the protected object satisfies a preset condition in the tracking mode, and cutting off a power supply of the dangerous device when the protected object satisfies the preset condition.

An intelligent control method includes monitoring whether a protected object is within a preset range of a dangerous device. The method includes starting a tracking mode for the protected object when monitoring that the protected object is within the preset range of the dangerous device. The method includes monitoring in real time whether the protected object satisfies a preset condition in the tracking mode, and cutting off a power supply of the dangerous device when the protected object satisfies the preset condition.

A power line resistance sensing device adapted to a lamp system with an LED module connected to a power supply between a supply line and a ground line. The power line resistance sensing device includes a control unit including a first pin connected to an LED switch to turn on or turn off the LED module; a second pin connected to a testing switch to fire a testing current from a testing current source into the lamp system before a full conduction of the lamp system; and a third pin used to receive a voltage drop induced by the testing current fired in the lamp system. The control unit is configured to compare the voltage drop with a predetermined safety voltage drop, thereby controlling the LED switch.

A power line resistance sensing device adapted to a lamp system with an LED module connected to a power supply between a supply line and a ground line. The power line resistance sensing device includes a control unit including a first pin connected to an LED switch to turn on or turn off the LED module; a second pin connected to a testing switch to fire a testing current from a testing current source into the lamp system before a full conduction of the lamp system; and a third pin used to receive a voltage drop induced by the testing current fired in the lamp system. The control unit is configured to compare the voltage drop with a predetermined safety voltage drop, thereby controlling the LED switch.

A power safety device comprising a controller, a load monitor and switching circuitry, wherein the switching circuitry is operable in a first operation state in which a power supply side and a load side are connected by a lower impedance power conduction path or a second operation state when impedance between the load side and the power supply side is high so that hazardous operation current is prevented from flowing from the power source side, through the switching circuitry, and to the load side, wherein the load monitor comprises circuit arrangements to determine and/or monitor load condition on the load side and the controller is to operate the switching circuitry to operate in the first operation state upon detection of a non-hazardous load condition or a predetermined safe load condition on the load side.

A power safety device comprising a controller, a load monitor and switching circuitry, wherein the switching circuitry is operable in a first operation state in which a power supply side and a load side are connected by a lower impedance power conduction path or a second operation state when impedance between the load side and the power supply side is high so that hazardous operation current is prevented from flowing from the power source side, through the switching circuitry, and to the load side, wherein the load monitor comprises circuit arrangements to determine and/or monitor load condition on the load side and the controller is to operate the switching circuitry to operate in the first operation state upon detection of a non-hazardous load condition or a predetermined safe load condition on the load side.

The invention relates to a method and a device for detecting fault currents in a regulated DC intermediate circuit having an active power factor correction.

The invention relates to a method and a device for detecting fault currents in a regulated DC intermediate circuit having an active power factor correction.