Home > PRODUCTS > PTC Thermistors > PTC thermistor for welding machine overload protection-15P,16P,19P > PTC Thermistor for welding machine overload protection-PTC 19P

  • Functional characteristics
  • Function:PTC Thermistor Special for over current,overload protection of welding machines.
    Model Number:19P-101R,19P-390R,19P-500R,19P-121R

    Technical parameters of Welding machine overload protection PTC Thermistor:
    19P nominal R25 resistance: conventional 100Ω,also 39Ω,50Ω,120Ω
    Allow R25 resistance deviation: 100 Ω ± 30%, others: ± 25 %
    Rated power: 0.5 W

    Brief Introduction of thermistor PTC for welding machine :
    MZ31 series 19P PTC thermistor are million- time safety thermistor of automatic circuit protection,recoverability, using repeatedly, and no trigger, noise or protective component that could protect and restore from abnormal temperature and current automatically,which called “auto restore fuse” and “ten-thousand-time fuse”.Recoverability, using repeatedly, and no trigger, noise or sparks.

    Working principle:
    When the circuit is in normal state, the current passing through the PTC thermistor is less than the rated current,
    and the PTC thermistor is normal and the resistance is small.Does not affect the normal operation of the protected circuit.
    When the circuit fails and the current greatly exceeds the rated current, the PTC thermistor suddenly heats up and is in a high resistance state.The circuit is disconnected to protect the circuit from damage. When the failure is eliminated, the PTC thermistor automatically returns to a low resistance state and the circuit returns to normal operation.
    PTC 16P,19P working principle

    Advantages:
    1.Automatic circuit protection,can resume steadily,
    2.contactless,noiseless and flameless,
    3.reacts fast,
    4. with a better performance of overvoltage protection,
    5.wide operating voltage range,
    6.small steady resistance,
    7.low rated current,
    8.small resistance,small size,
    9.stable for a long time,
    10.no need to be reset supply after overload protection,
    11.wide operating temperature range,
    0 ~ +60°C (V=Vmax),
    -25 ~ +125°C (V=0),
    12.RoHS compliant.

    Special PTC Thermistor for Welding machine overload protection Appearance and Dimension(In: mm)
    PTC 19P Thermistor dimension:

    finished product diameter 17.5-18 .0 mm, mold size is 20mm.
    Foot distance is 7.5 ± 0.5 mm.
    Foot length: the length of the cut foot is 6mm.
    19P is thicker than 15P and 16P.
    PTC thermistor 19P for welding machine overload protection

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