Toroidal chokes for dimmer noise suppression white label 534455 a 1mh toroidal choke that has an iron powder core that provides the permeability and magnetic saturation characteristics required for effective noise suppression suitable for use in filter chokes for thyristor and triac circuits light dimmers rotation speed adjusters etc white label 534455 toroidal chokes inductivity 1 mh 250 vac 16 a