Three-Phase Common Mode Power Line Chokes Würth Elektronik TPB and TPB HV Three-Phase Common Mode Power Line Chokes for high voltage applications, ensure a rated voltage of up to 760VAC. These chokes feature an innovative and patented design with plastic housing, separator bar, and base plate. The insulation materials are UL94-V0 rated. Würth Elektronik Three-Phase Common Mode Power Line Chokes can also be fixed on the PCB with a sheet-metal screw for improved stability.