Circuit arrangement with an inverter and method for testing the functionality of electromechanical switches

The arrangement has outer-sided phase conductors (P1-P3) connected with phases (L1-L3) of a three-phase alternating voltage system (WN). Each phase conductor is fed over a series connection to form two switching contacts (SK1, SK2) of various electromagnetic switches (R1, R2) to be controlled by a controlling unit (ST). The controlling unit detects valves of voltages (U1-U3) on the conductors using measuring units (M1-M3) and controls the switches during switching on and off of an inverter (WR). The controlling unit detects voltages on the conductors. An independent claim is also included for a method for functional checking of electromechanical switches in a circuit arrangement.