Ferrite Rings

Ferrite rings are toroidal (doughnut) shaped, or cylindrical shaped pieces of ferrite (a ceramic compound).
What do they do?
Ferrite rings help to protect against EMI (electromagnetic interference) and RFI (radio frequency interference). They prevent interference moving to a device or from a device.
How do they work?
Ferrite rings can suppress noise without grounding. Ferrites are able to attract magnetic flux. When a cable is passed through the ring, the magnetic fields created by the cable are concentrated within the ferrite ring. This magnetic energy is converted to heat and the ferrite dissipates this by magnetic loss.
How are they used?
Ferrite rings can often be seen with cables threaded through them. They are common place in electronics to help with noise suppression. The cable can also be wrapped about the ferrite ring numerous times. Ferrite rings can be incorporated into broadband transformers, pulse transformers and common mode chokes.

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Description Price Type Dimensions Application Impedance Material Diameter Height Inner Diameter Outer Diameter Outer Dimensions Inner Dimensions Outer Height Series Aperture Diameter
RS Stock No. 124-1532
Mfr. Part No.74270090
£2.538
Each (In a Pack of 10)
Units
Axial Ferrite Bead 26 x 13 x 28.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 4 W 620 - 28.5mm 13mm 26mm - - - - -
RS Stock No. 163-4552
Mfr. Part No.742701703
£1.003
Each (In a Tray of 130)
Units
Toroid Core 25 x 15 x 12mm EMI Suppression - 7 W 380 12mm 12mm 15mm 25mm - - - - -
RS Stock No. 788-0200
Mfr. Part No.742701703
£1.49
Each
Units
Toroid Core 25 x 15 x 12mm EMI Suppression - 7 W 380 12mm 12mm 15mm 25mm - - - - -
RS Stock No. 788-0226
Mfr. Part No.74270191
£5.07
Each
Units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS Stock No. 163-4558
Mfr. Part No.74270191
£4.209
Each (In a Tray of 15)
Units
Toroid Core 61 x 35.5 x 20mm EMI Suppression - 4 W 620 20mm 20mm 35.5mm 61mm - - - - -
RS Stock No. 124-1548
Mfr. Part No.74270081
£0.682
Each (In a Pack of 10)
Units
Ferrite Core 14.2 x 8.2 x 28.5mm General Electronics - 3 W 800 - 28.5mm 8.2mm 14.2mm - - - - -
RS Stock No. 144-9783
Mfr. Part No.74270033
£0.444
Each (In a Bag of 500)
Units
EMI Suppression Axial Ferrite Bead 9.5 x 4.75 x 9.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 3 W 800 - 9.5mm 4.75mm 9.5mm - - - - -
RS Stock No. 124-1541
Mfr. Part No.74270033
£0.51
Each (In a Pack of 20)
Units
EMI Suppression Axial Ferrite Bead 9.5 x 4.75 x 9.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 3 W 800 - 9.5mm 4.75mm 9.5mm - - - - -
RS Stock No. 124-1549
Mfr. Part No.74270043
£1.088
Each (In a Pack of 5)
Units
EMI Suppression Axial Ferrite Bead 15.5 x 7.3 x 28.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 3 W 800 - 28.5mm 7.3mm 15.5mm - - - - -
RS Stock No. 124-1535
Mfr. Part No.74270053
£1.505
Each (In a Pack of 10)
Units
EMI Suppression Axial Ferrite Bead 16 x 8 x 28.5mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 3 W 800 - 28.5mm 8mm 16mm - - - - -
RS Stock No. 617-1259
Mfr. Part No.74270057
£4.59
Each
Units
Ferrite Core 19 (Dia.) x 50.8mm General Electronics - Ferrite - 50.8mm 11.5mm 19mm - - - - -
RS Stock No. 163-3523
Mfr. Part No.74270057
£2.783
Each (In a Tray of 60)
Units
Ferrite Core 19 (Dia.) x 50.8mm General Electronics - Ferrite - 50.8mm 11.5mm 19mm - - - - -
RS Stock No. 124-1543
Mfr. Part No.74270032
£0.685
Each (In a Pack of 10)
Units
EMI Suppression Axial Ferrite Bead 11.5 x 5 x 25mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 4 W 620 - 25mm 5mm 11.5mm - - - - -
RS Stock No. 124-1849
Mfr. Part No.742701716
£0.62
Each (In a Pack of 10)
Units
EMI Suppression Toroidal Ferrite 12.7 x 7.9 x 6.35mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 7 W 380 - 6.35mm 7.9mm 12.7mm - - - - -
RS Stock No. 163-4540
Mfr. Part No.74270097
£5.469
Each (In a Tray of 15)
Units
Toroid Core 61 x 35.5 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 35.5mm 61mm - - - - -
RS Stock No. 788-0143
Mfr. Part No.74270097
£6.34
Each
Units
Toroid Core 61 x 35.5 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 35.5mm 61mm - - - - -
RS Stock No. 124-1851
Mfr. Part No.7427011
£0.927
Each (In a Pack of 10)
Units
EMI Suppression Toroidal Ferrite 16.5 x 8 x 16mm Coaxial Cable, Multiconductor Wire, Wires, Wire-Wrapping Cable - 4 W 620 - 16mm 8mm 16.5mm - - - - -
RS Stock No. 163-4550
Mfr. Part No.74270151
£2.646
Each (In a Tray of 63)
Units
Toroid Core 34.6 x 20.8 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 20.8mm 34.6mm - - - - -
RS Stock No. 788-0197
Mfr. Part No.74270151
£3.88
Each
Units
Toroid Core 34.6 x 20.8 x 12.7mm EMI Suppression - 4 W 620 12.7mm 12.7mm 20.8mm 34.6mm - - - - -
RS Stock No. 124-1537
Mfr. Part No.7427005
£1.085
Each (In a Pack of 10)
Units
Ferrite Core 16 x 9 x 28mm General Electronics - 4 W 620 16mm 28mm 9mm 16mm - - - - -