Abstract: The invention concerns a self-commutating inverter with controlled main valves in a center-tap circuit, with which a commutation capacitor, a series choke and a recovery valve each are associated, and with a transformer for connecting a variable load. In order to reduce the no-load losses, the two series diodes which are customarily connected in series with the main valves, are omitted. Provision is made instead for connecting in series with the commutation capacitor an electronic switching member which can be switched-on together with the main valves.