The FN 3120 H-50-53 from Schaffner is a EMI / EMC Filter with Voltage Rating 300 to 520 V, Current Rating 50 to 54 A, Leakage Current 10.5 mA, Temperature operating range -25 to 100 Degree C. Tags: Chassis Mount. More details for FN 3120 H-50-53 can be seen below.