More Information On Ferrites
A ferrite is a bead that reduces or prevents EMI (electromagnetic interference) from a device or to a device.
Ferrites offered by Interpower consist of permeable substances that are used to suppress unwanted EMI from entering or leaving the equipment through the power cord or cord set. They have medium permeability and high resistive impedance. Designed for suppression of signals between 30 and 300MHz, these ferrites are made mostly of nickel zinc. A combination of oxides from other metals, such as magnesium, manganese, copper, or cobalt, may also be included in the makeup.
When determining what kind of ferrite to use on the cable, there are several factors to consider: impedance range, frequency range, and size and kind of cable it will be used on. When applying the ferrite onto the cable, Interpower recommends molding it four to six inches from the strain relief at the equipment or the IEC 60320 connector of a cord set. Interpower offers three different ferrites which can only be molded onto North American cable. There is a snap-on version which can be used on both international and North American cable.
For ferrite part numbers, see the ferrites product page.