Schaffner's RB series of common-mode chokes are used to suppress EMI noise in PCB integrated filter designs with power lines up to 600 V_AC or 1000 V_DC.

EMI noise is generated by electronic equipment such as switched power electronics or high slew rate controllers and can travel back through power lines disrupting the proper function of electronic devices such as TV sets or radios. The EMI noise can be attenuated by using the RB series with line bypass capacitors or in combination with single phase filters for extra low leakage designs.