Power Thermistors

A Power Thermistor, also called Power NTC or inrush current limiter, is an electronical component which suppresses inrush currents of electric circuits.
Switching power supplies, AC motors, and lighting ballasts can induce an inrush current of more than 100 times the nominal current when the circuit is switched on.
The Power Thermistor heats up when an inrush current passes through it.
The heat up causes a dramatic decrease in resistance and protects electric equipment from being damaged.

There are 9 of 69 products shown.

15D2-15

  • Disc diameter [mm]: 16.5 mm
  • R25 [Ω]: 15 Ω
  • B25/85 [K]: 3,100 K
  • I max. [A]: 4 A
  • Rresidual [Ω]: 0.45 Ω
  • Thermal time constant [s]: 70 s
  • Dissipation factor [mW/°C]: 41 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
15D2-15

8D2-18

  • Disc diameter [mm]: 19.5 mm
  • R25 [Ω]: 8 Ω
  • B25/85 [K]: 3,050 K
  • I max. [A]: 6 A
  • Rresidual [Ω]: 0.26 Ω
  • Thermal time constant [s]: 90 s
  • Dissipation factor [mW/°C]: 53 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
8D2-18

5D2-18

  • Disc diameter [mm]: 19.5 mm
  • R25 [Ω]: 5 Ω
  • B25/85 [K]: 2,950 K
  • I max. [A]: 8 A
  • Rresidual [Ω]: 0.18 Ω
  • Thermal time constant [s]: 90 s
  • Dissipation factor [mW/°C]: 66 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
5D2-18

4D2-18

  • Disc diameter [mm]: 19.5 mm
  • R25 [Ω]: 4 Ω
  • B25/85 [K]: 2,900 K
  • I max. [A]: 8 A
  • Rresidual [Ω]: 0.16 Ω
  • Thermal time constant [s]: 90 s
  • Dissipation factor [mW/°C]: 59 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
4D2-18

47D2-18

  • Disc diameter [mm]: 19.5 mm
  • R25 [Ω]: 47 Ω
  • B25/85 [K]: 3,450 K
  • I max. [A]: 2 A
  • Rresidual [Ω]: 0.94 Ω
  • Thermal time constant [s]: 90 s
  • Dissipation factor [mW/°C]: 21 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
47D2-18

1D2-22

  • Disc diameter [mm]: 23 mm
  • R25 [Ω]: 1 Ω
  • B25/85 [K]: 2,900 K
  • I max. [A]: 12 A
  • Rresidual [Ω]: 0.04 Ω
  • Thermal time constant [s]: 125 s
  • Dissipation factor [mW/°C]: 32 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
1D2-22

6D2-22

  • Disc diameter [mm]: 23 mm
  • R25 [Ω]: 6 Ω
  • B25/85 [K]: 3,000 K
  • I max. [A]: 6 A
  • Rresidual [Ω]: 0.21 Ω
  • Thermal time constant [s]: 130 s
  • Dissipation factor [mW/°C]: 43 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
6D2-22

4D2-22

  • Disc diameter [mm]: 23 mm
  • R25 [Ω]: 4 Ω
  • B25/85 [K]: 2,900 K
  • I max. [A]: 8 A
  • Rresidual [Ω]: 0.16 Ω
  • Thermal time constant [s]: 130 s
  • Dissipation factor [mW/°C]: 59 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
4D2-22

3D2-22

  • Disc diameter [mm]: 23 mm
  • R25 [Ω]: 3 Ω
  • B25/85 [K]: 2,800 K
  • I max. [A]: 8 A
  • Rresidual [Ω]: 0.13 Ω
  • Thermal time constant [s]: 130 s
  • Dissipation factor [mW/°C]: 48 mW/°C
  • Toperating [°C]: -50~200
  • Manufacturer: Semitec
3D2-22
Disc diameter [mm]

R25 [Ω]

B25/85 [K]

I max. [A]

Rresidual [Ω]

Thermal time constant [s]

Dissipation factor [mW/°C]

Toperating [°C]

C [µF]

E [J]

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