SINAMICS line filter class B for Power Module FSD 3AC 380V-480V 72A Electrical filter SINAMICS line filter class B for the modular frequency converter SINAMICS G120. With one of the additional line filters, the Power Module achieves a higher radio interference class. The line filter is available for frame sizes FSA to FSF. It can also be installed under the frame sizes FSA to FSC. SINAMICS - simply my drive.