6SE6400-3CC00-6AD3 SIEMENS AC commutation choke Description And Features The 6SE6400-3CC00-6AD3 is an AC commutation choke manufactured by Siemens. It is used in conjunction with variable frequency drives (VFDs) — in this case, Micromaster 4 — to improve performance and reduce stress on power electronics. Frequently Asked Questions About 6SE6400-3CC00-6AD3 1. What is the Siemens 6SE6400-3CC00-6AD3? The 6SE6400-3CC00-6AD3 is an AC commutation choke designed for Siemens