Device, system and method for the application of low-voltage relays

Abstract

A device (10), a relay unit (250), and a method (500) for mains applications for controlling a relay (100) are claimed. The device (10) comprises a transformer (20) for converting an input voltage (UE) of the device (10) into an operating voltage (UB), wherein the operating voltage (UB) is configured as a control voltage for a relay coil of the connectable relay (100). The device (10) further comprises a semiconductor switch (30) for periodically interrupting a current on a primary side of the transformer (20), a control unit (40) for controlling the semiconductor switch (30), and a voltage regulator (50) for supplying power to the control unit (40). A current-limiting resistor (60) is also included, which is arranged between an input contact (C11) of the input voltage (UE) and the primary side of the transformer (20).

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