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NTC thermistors for inrush current limiting

Posted: 24 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:application note? NTC thermistor? capacitor?

Like all NTCs, NTC thermistors for inrush current limiting are made of polycrystalline mixed-oxide ceramics.

High inrush currents occur when many items of electrical equipment such as switched mode power supplies, motors, transformers and amplifiers are turned on. These currents can damage individual components or entire subassemblies and blow fuses in error. Such high currents are caused by the extremely low impedance of smoothing capacitors or coils, which almost produce short circuits at the moment of switching on. NTC thermistors acting as inrush current limiters solve this problem without elaborate circuitry at low cost.

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