The FN3258-180-40 from Schaffner is a EMI / EMC Filter with Voltage Rating 277 to 520 V, Current Rating 180 to 197.1 A, Leakage Current 4.3 mA, Temperature operating range -25 to 100 Degree C. Tags: Chassis Mount. More details for FN3258-180-40 can be seen below.