RT Series Chokes Schaffner RT Series Chokes allow designers the ability to integrate great saturation behavior with high common-mode performance onto a PCB. The chokes are available in 2-line and 3-line versions with standard current ranges from 6 to 20A with voltages up to 600VAC and horizontal and vertical mounting options. The wide range of 24 different combinations of layout, mounting position, and current-inductance ratings makes Schaffner RT ideal for solar inverters and switch-mode power supplies (SMPS).