Hello,
Small details can make a big difference. For example—electromagnetic interference (EMI) can cause problems in the operation of electrical or electronic devices. One solution to help reduce EMI is incorporating ferrites into the product design.
A ferrite is a bead that reduces or helps prevent EMI from a device or to a device. EMI is an occurrence generated by another strong electromagnetic field or signal which affects the performance of an electrical or data circuit, adversely affecting equipment performance.
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 one snap-on version which can be used on both international cable and North American cable.
The following table shows the ferrites offered by Interpower.
| Part Number |
Minimum Impedance |
Impedance |
Frequency |
Cable Choices |
| 52100040 |
25 MHz —
100 ohms |
100 MHz —
approx. 200 ohms |
30–200 MHz |
3x16AWG SJT fillerless PVC
3x14AWG SJT fillerless PVC
|
| 52100050 |
25 MHz —
104 ohms |
100 MHz —
approx. 213 ohms |
30–200 MHz |
3x18AWG SJT fillerless PVC |
| 52100060 |
25 MHz —
137 ohms |
100 MHz —
approx. 250 ohms |
30–200 MHz |
3x18AWG SVT fillerless PVC |
| 52100110 |
30-100 MHz — approx. 50 ohms |
100-500 MHz — approx. 100 ohms |
30–300 MHz |
3x0.75mm2 PVC and rubber
3x1.00mm2 PVC and rubber
3x1.50mm2 PVC
3x18AWG PVC and rubber
3x16AWG PVC |
Additional Resources
See the complete line of Ferrites and Value-Added Services available at Interpower.
Interpower offers a 1-week U.S. manufacturing lead-time on non-stock Interpower products, no minimum order or dollar requirements, and same day shipping on in-stock products. Blanket and scheduled orders along with value-added services are available. If you have questions, Interpower offers free technical support. You can check the website at www.interpower.com, e-mail sales@interpower.com (United States) or uk@interpower.com (United Kingdom) or contact Customer Service in the United States at (800) 662-2290 or in the United Kingdom at +44 (0)1908 295300.
