NTC Thermistor 1 Ω 3.1 W (Inrush Current Limiter)
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Prices updated: 12 Oct 2026
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About this product
An NTC thermistor with 1 Ω resistance at 25 °C and a 3100 mW power rating, used as a soft-start element to limit inrush current in motors and switching power supplies. Its resistance falls as it heats, so it limits the initial surge and has less effect once warm. Thermal time constant is 90 s and tolerance is ±20%.
Specifications
- Type
- NTC
- Resistance at 25 °C
- 1 Ω
- Power rating
- 3100 mW
- Thermal time constant
- 90 s
- Tolerance
- ±20%
- Application
- Soft start for motors and switching power supplies
Frequently asked questions
Where do I place an NTC inrush limiter in a circuit?
It is placed in series with the supply input, before the bulk capacitor or the load, so the initial charging current passes through it. Check the rated current and voltage of your circuit before selecting it.
Why does the thermistor need time to cool before power is cycled again?
Its resistance stays low while it is hot, so after a quick power-off and power-on it provides little inrush limiting. Allow it to cool before restarting, as the listing's 90 s thermal time constant indicates how slowly it changes temperature.
