MICROMASTER 4 output choke 380-480V 3AC 38A (HO/CT)/45A (LO/VT) stand-alone FS D-0.82 MH Electrical choke SINAMICS output choke for the modular frequency converter SINAMICS G120, as well as the MICROMASTER 4. Output chokes are used to reduce the capacitive compensating currents and voltage gradient (du/dt) for motor cables > 50 m (shielded) or > 100 m (unshielded). The output choke covers the three-phase voltage range 3AC 200 V to 600 V. It is available as a substructure for frame sizes FSA to FSC. SINAMICS - simply my drive.