Device for powering electric or electronic devices operatively associated with a circuit breaker

A power supply device for powering one or more electric/electronic devices operatively associated with a low-voltage circuit breaker, comprising means for taking energy from a power supply line, electronic regulating means that receive the energy collected by said means for taking power as input and deliver as output to the electric/electronic devices a power supply voltage (Vout) having a value within a preset range with respect to a reference voltage (VR), wherein said electronic regulating means comprise:

• energy storage means, chargeable by means of said energy collected by said means for taking energy, the terminals of which carry a voltage (VCL) that is indicative of the power supply voltage (Vout) delivered to the electric/electronic device;
• a circuit for enabling/disabling the charging of the storage means;
• a feedback circuit that receives an input signal indicative of the voltage (VCL) at the terminals of the storage means, and that sends a command signal to the enabling/disabling circuit such that the latter enables or disables the charging process in order to keep the voltage at the terminals of the storage means within said preset range, said feedback circuit enabling the charging phase so as to power the storage means continuously up until the voltage at the terminals of the storage means is within said preset range;
• protection means suitable for taking action in the event of the occurrence of anomalous operating conditions;
• wherein said protection means comprise at least one resistor (Rsense) for coupling operatively with said power supply line, a current indicative of the current circulating in said power supply line passing through said resistor, thereby providing a voltage at the terminals of said resistor, which is indicative of the current in said power supply line, a signal indicating the voltage at the terminals of said resistor being delivered either directly to said feedback circuit or to a circuit safeguard device.