FN321B-1-05 is a part of the Schaffner line of Filter Chokes, which are used to reduce radio frequency disturbances. It is a flat choke, with a nominal impedance of 30mO, a rated current of 5A, a rated voltage of 32V, a rated frequency of 100kHz, and an inductance of 0,5mH. The part is UL approved and RoHS compliant, and is made in a compact, lightweight design.