SINAMICS output choke for power modules FSB 3AC 380V-480V 18.5A Electrical choke SINAMICS output choke for the modular frequency converter SINAMICS G120 and the compact converter SINAMICS G120C. Output chokes reduce the voltage gradient (du/dt) and the height of the current peaks. They also enable the connection of longer motor cable lengths. , The output choke should be mounted as close to the power module as possible. SINAMICS - simply my drive.