Abstract: A utilization unit of an electric switch includes an actuator module which includes actuators and power transmission apparatus to operate the electric switch, a power module which includes power supply means for the actuators of the actuator module, a control module which includes control means to control the power module, and data transmission means. The actuator module, the power module, and the control module constitute a modular structure, wherein the power module and the control module are detachably connected to each other and the actuator module so that the power module and the control module are both separately replaceable in the utilization unit.

Abstract: The invention relates to a method and an arrangement for determining an end-of-life of an overvoltage protection element (2) by determining (101) a predefined voltage limit based on a nominal voltage, determining (102) a measuring voltage across switch components (5) of the switch arrangement in connection with a switch-off event, and determining (103) that the overvoltage protection element (2) has reached its end-of-life when the measuring voltage is equal to or lower than the predefined voltage limit.