Switching assembly and method for insulation monitoring for converter applications in operation

The monitoring method involves simultaneously switching the connection to a positive branch (3) or negative branch (4) of an inverter (10) in order to measure the voltage of the positive branch and the negative branch. The variables of a function of the measured voltages are determined and insulation defects at an intermediate voltage circuit, at the phase connections (2) or at an electrical apparatus (11) are determined by comparing the obtained variables with corresponding reference values, and if a deviation exceeded a predetermined limit, the presence of insulation defect is assumed. Independent claims are included for the following: (1) Insulation monitoring device for inverter applications; and (2) Method for manufacturing monitoring apparatus.