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P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element Featured Image
  • P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element
  • P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element
  • P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element
  • P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element
  • P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element

P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element

Short Description:

PTC thermistor alloy wire finds application in various fields due to its unique characteristics. Here are some common applications of PTC thermistors:

Overcurrent protection: PTC thermistors are widely used in electrical circuits for overcurrent protection. When a high current flows through the PTC thermistor, its temperature increases, causing the resistance to rise rapidly. This increase in resistance limits the current flow, protecting the circuit from damage due to excessive current.


  • Model NO.: P-4000 Thermistor wire
  • Material: Nickel Iron alloy wire
  • Surface: Bright
  • Diameter: 0.025-5.0mm
  • sample: accepted sample order
  • resistivity: 0.13-0.60
  • Origin: Shanghai China

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    P-4000 Thermistor Resistance Alloy Wire for PTC Heating Element

    PTC thermistor alloy wire finds application in various fields due to its unique characteristics. Here are some common applications of PTC thermistors:

    Overcurrent protection: PTC thermistors are widely used in electrical circuits for overcurrent protection. When a high current flows through the PTC thermistor, its temperature increases, causing the resistance to rise rapidly. This increase in resistance limits the current flow, protecting the circuit from damage due to excessive current.

    Temperature sensing and control: PTC thermistors are used as temperature sensors in applications such as thermostats, HVAC systems, and temperature monitoring devices. The resistance of the PTC thermistor changes with temperature, allowing it to accurately sense and measure temperature variations.

    Self-regulating heaters: PTC thermistors are employed in self-regulating heating elements. When used in heaters, the PTC thermistor’s resistance increases with temperature. As the temperature rises, the resistance of the PTC thermistor also increases, leading to a decrease in power output and preventing overheating.

    Motor starting and protection: PTC thermistors are utilized in motor starting circuits to limit the high inrush current during motor startup. The PTC thermistor acts as a current limiter, gradually increasing its resistance as the current flows, thereby protecting the motor from excessive current and preventing damage.

    Battery pack protection: PTC thermistors are employed in battery packs to protect against overcharging and overcurrent conditions. They act as a safeguard by limiting the current flow and preventing excessive heat generation, which can damage the battery cells.

    Inrush current limitation: PTC thermistors serve as inrush current limiters in power supplies and electronic devices. They help reduce the initial surge of current that occurs when a power supply is turned on, protecting the components and improving system reliability.

    These are just a few examples of the applications where PTC thermistor alloy wire is used. The specific application and design considerations will determine the exact alloy composition, form factor, and operating parameters of the PTC thermistor.
    Chemical composition:

    Name Code Main Composition
    Fe S Ni C P Standard
    Temperature Sensitive Resistance alloy wire PTC Bal. ≤0.01 77~82 ≤ 0.05 ≤0.01 Q/320421PTC4500-2008

    Specifications  and   tolerances

     Diameter 0.05 0.10 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25
    Tolerance ± 0.003 ± 0.005 ± 0.008

    Temp.Coeff.Of resistance(20ºC)

    Type P-4500 P-4000 P-3800 P-3500 P-3000 P-2500
    0~150ºCaverage × 10%%Z 4500 ≥4000 ≥3800 ≥3500 ≥3000 ≥2500

    Resistivity (20ºC)(μΩ.m)

    Type P-4500 P-4000 P-3800 P-3500 P-3000 P-2500
    at20ºCresistance ±5%μΩ.m 0.19 0.25 0.27 0.36 0.40 0.43

    The table for resistance

    Product ±0.5%Ω/m Dia.(mm)and cross-sectional area (mm²)
    0.05 0.10 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25
    0.00196 0.00785 0.00176 0.0201 0.0227 0.0255 0.0284 0.0314 0.0346 0.0380 0.0415 0.0452 0.0491
    P-4500 96.93 24.20 10.79 9.45 8.37 7.45 6.69 6.05 5.49 5.00 4.58 4.20 3.87
    P-4000 127.55 31.84 14.20 12.43 11.014 9.80 8.80 7.69 7.22 6.58 6.02 5.53 5.09
    P-3800 137.75 34.39 15.34 13.43 11.89 10.59 9.51 8.60 7.80 7.11 6.51 5.97 5.50
    P-3500 183.67 45.85 20.45 17.91 15.86 14.12 12.68 11.46 10.40 9.47 8.67 7.96 7.33
    P-3000 204.08 50.95 22.72 19.90 17.62 15.68 14.08 12.73 11.56 10.52 9.63 8.84 8.14
    P-2500 219.38 54.77 24.43 21.39 18.94 16.86 15.14 13.69 12.42 11.31 10.36 9.51 8.75

    The weight per spool

    specification (mm) ≤0.05 >0.05~0.10 >0.10~0.15 >0.15~0.25
    Weight per spool Standard weight 20 30 100 300
    Lesser weight 10 20 50 100

    Elongation(%)

    Standard ≤0.05 >0.05~0.10 >0.10~0.15 >0.15~0.25
    Alloy wire (soft)elongation 10% 12% 16% 20%
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