UK-manufactured open former 4A common-mode suppression choke from the CF series specifically designed to attenuate mains-borne RF interference. * Double wound ferrite ring * Vertical mounting * Flame-retardant plastic carrier * Inductance 2.4mH * DC resistance 40mR * Pitch 25.4mm * High attenuation to unwanted RFI can be achieved by the addition of X2 and Y capacitors