Abstract: A diagnostic method for an actuator having a coil and a control device for supplying power to the coil, by controlling a power supply to the actuator by a diagnostic device, controlling a supply of power to the coil by a control device, monitoring an electric signal supplying the actuator, and deriving a diagnostic indicator of the actuator from a result of monitoring; and a device and computer code for executing the method.

Abstract: A diagnostic method of an actuator comprising a coil and a control device of power supply of the coil, comprising the following steps: Control of a power supply of the actuator by means of a diagnostic device, Control of a power supply of the coil by means of the control device, Monitoring, at the level of the diagnostic device, of an electric characteristic of an electric signal, in particular of the electric signal supplying the actuator, and Deduction of a diagnostic of the actuator using the result of the monitoring step. The device and the actuator implement the method.

Abstract: An auxiliary device for remote data transmission having processing means comprising a first input to receive a first data item of a state of the circuit breaker, and at least one command output to command transmission of data. The processing means comprise: a second input to receive at least one second data item representative of an electrical fault or of an auxiliary command, identification means to identify the type of electrical fault, and initialization means of the at least one command output. An auxiliary unit and a circuit breaker comprising the device. A method for implementing said device.

Abstract: A differential protection device comprising: differential current measuring means, processing means connected to the measuring means and comprising operating rating selection means and time delay selection means to select tripping curves, actuating means, and test means connected to the measuring means. In the protection device the test means are associated with the operating rating selection means and with the time delay selection means to select a minimum or reduced operating rating and to select a minimum or reduced time delay when said test means are actuated.

Abstract: A differential protection device comprising: differential current measuring means, processing means connected to the measuring means and comprising operating rating selection means and time delay selection means to select tripping curves, actuating means, and test means connected to the measuring means. In the protection device the test means are associated with the operating rating selection means and with the time delay selection means to select a minimum or reduced operating rating and to select a minimum or reduced time delay when said test means are actuated.

Abstract: An auxiliary device for remote data transmission having processing means comprising a first input to receive a first data item of a state of the circuit breaker, and at least one command output to command transmission of data. The processing means comprise: a second input to receive at least one second data item representative of an electrical fault or of an auxiliary command, identification means to identify the type of electrical fault, and initialization means of the at least one command output. An auxiliary unit and a circuit breaker comprising the device. A method for implementing said device.

Abstract: The device compares a voltage representative of the supply voltage of the electromagnet with two distinct inrush thresholds and a drop-out threshold. As soon as this voltage reaches one of the inrush thresholds, the device commands switching to an inrush phase of preset duration. The first inrush threshold is representative of a voltage of about 40 to 50% of the rated supply voltage of the electromagnet, whereas the second inrush threshold is representative of 70 to 85% of this voltage. The same control device can thus be used with both an under-voltage release and a shunt release or for a circuit breaker closing electromagnet.

Abstract: The control device comprises two power supply terminals and a local control terminal connected by a local control means to one of the power supply terminals. A control circuit receives on a first input a first full-wave rectified voltage representative of the supply voltage, and on a second input a second half-wave rectified voltage representative of the voltage applied to the local control terminal. To eliminate spurious orders, it compares a quantity G1 representative of at least one non-null sample of the second voltage to a percentage of a quantity G2 representative of associated samples of the first voltage, sampling of the two voltages being almost simultaneous. If G1≧0.8G2, the device considers that a control order has been received and if G1 ≦0.7G2, that no order has been received.

Abstract: The device comprises two power supply terminals, a local control terminal and remote control and presence detection terminals. It can operate in fully autonomous manner, the power supply terminals being connected to a voltage supply source by means of a local control switch, closing of which causes excitation of a coil of the electro-magnet. It can also operate in conjunction with a communication module. In this case, the terminals are permanently supplied by the source, the local control terminal is connected to one of the power supply terminals by a local control switch and the remote control and presence detection terminals are connected to the module. The device automatically detects the presence of the module and causes excitation of the coil if the supply voltage is sufficient and if a control signal is applied to it either by the local control switch or by the module.

Abstract: The device comprises means for detecting an unscheduled movement of the movable core of an electromagnet during a holding phase. For this, a control and regulation circuit monitors the current flowing in at least one coil of the electromagnet. When, during a holding phase, the current flowing in the coil is greater than a setpoint value and either remains so during a preset time or is increasing, an unscheduled movement is then considered as being detected and the device makes the electro-magnet switch to inrush phase with a much higher current.