FN9280 & FN9290 - IEC Inlet Filter The FN9280 & FN9290 series ultra-compact shielded IEC inlet filters with a combined dual fuse holder and 2-pole rocker switch. The flange mounting variant is supplied with a kit to fascinate either front or rear mounting using either a horizontal or vertical mounting plate. Applications for the FN9280 & FN9290 series include: portable electrical and electronic equipment; consumer goods; EDP and office equipment; single-phase power supplies; switch-mode power supplies; test and measurement equipment