Control circuit for an electromagnetic actuator, method for controlling an electromagnetic actuator and medium-voltage circuit breaker with an electromagnetic actuator and the control circuit

摘要

The present invention relates to a control circuit (1) for an electromagnetic actuator, in particular for a magnetic drive of a circuit breaker, which has a control signal input (10, 11) and connection terminals for the electromagnetic actuator (20, 21). According to the invention, the control circuit has switching means which provide a switching voltage for the electromagnetic actuator in response to a control signal present at the control signal input, as well as checking means which check the control signal for a predetermined or predeterminable period of time and end the provision of the switching voltage for the electromagnetic actuator as soon as during operation an invalidity of the control signal is established (120) within the predetermined or predeterminable period of time. In this case, the switching means are configured to provide the switching voltage for the electromagnetic actuator with a predetermined or predeterminable delay, the delay being selected such that the predetermined or predeterminable period of time ends before energy fed into a coil of the electromagnetic actuator by means of the switching voltage becomes Movement of the actuator has led.