Home > PRODUCTS > PTC Thermistors > PTC thermistor for Overcurrent and overload protection-MZ31 series > PTC thermistor for overload protection MZ31 series

  • Functional characteristics
  • PTC thermistor for overload protection MZ31 series
    Brief Introduction of PTC thermistor MZ31 series :
    MZ31 series PTC thermistor is a 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:
    As indicated in Fig 2 as below,when circuit is in the normal state, the current through PTC thermistor is lower than the rated current and PTC thermistor
    is in the normal state with small resistance value,which will not affect the normal operation of the protected circuit such as primary and secondary loops
    of the voltage transformer.In case of some trouble in the circuit and the current is bigger than the rated current,the PTC thermistor will become hot
    quicklyand present high resistance value, which sets the circuit relatively “off” to protect the circuit from damage.After the trouble is removed,PTC thermistor
    will automatically restore its low resistance state and the circuit will resume normal operation.
    PTC thermistor for overload protection MZ31 series working principle

    Product Applications:
    circuit protection,overvoltage protection,overload protection,short circuit protection of general circuit,e.g. transformers,mico motor,switch power,
    electric energy meter,charger,adaptor,meter,apparatus,electronic coils,control panels,home appliances,air conditioning,microwave oven etc.
    Overload protection of intelligent watt-hour meter RS485 interface, digital multimeter,micromotor and transistor.
    PTC thermistor for overload protection MZ31 series application

    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.

    Choose guidelines of PTC thermistor for overvoltage protection:
    In selecting PTC thermistor as overvoltage protection,overload protection component,firstly,make sure of the maximum operating current in the
    circuit(non-trip current of PTC thermistor) and maximum operating voltage,rated zero power resistance,and also the outlook and dimension should
    be also taken into consideration.Relation between operating temperature,operating current and non-operating current is as shown in Fig 3 as below.
    Operating current is normally 2-3 times compared as non-operating current,and both of the currents will be reduced as operating temperature increases.

    Marking of Part Number:
    PTC thermistor MZ31 Marking of Part Number
    1.Series:PTC thermistor for overvoltage protection
    2.Type:1-disc,2-encased,3-pin form-coating,4-pin form non-coating,5-SMD
    3.Type:A-general, B-compount, C-moduie
    4.Chip size: 8-Φ8mm 9-Φ9mm 11-Φ11mm
    5.Curie temperature: F-50℃ H-75℃ N-100℃ P-120℃ K-125℃
    6.R25 resistance: 6R0-6Ω 6R5-6.5Ω 70R-70Ω 121-120Ω
    7.Resistance tolerance: K+/-10% M+/-20% H+/-25% N+/-30%
    8.Greatly voltage:250-250V 265-265V
    9.Wire shape: S-Straight, A-Axis formed, U-In-formed

    Dimension(Unit: mm):
    PTC thermistor for overload protection MZ31 series dimension
    Specification&Part No.:

    Item Part No. Resistance
    @25 ℃
    R 25(Ω)±25%
    Non-trip current
    Int(mA)
    Trip current
    @25℃
    It(mA)
    Max Operating Voltage
    Vmax (V)
    Max.
    current
    I m a x ( A )
    Curie temperature
    T c (℃)
    Dimension
    (mm)
    @25℃ @60℃ D max T max Φd ±0.02
    1 MZ31-3A20K3R7H265 3.7 530 430 1050 265 4.3 125 22.0 5.0 0.6
    2 MZ31-3A16K6R0H265 6 390 300 780 265 3.1 17.5 5.0 0.6
    3 MZ31-3A16K7R0H265 7 350 280 700 265 3.1 17.5 5.0 0.6
    4 MZ31-3A13K10RH265 10 260 200 520 265 1.8 14.0 5.0 0.6
    5 MZ31-3A13K12RH265 12 225 180 450 265 1.8 14.0 5.0 0.6
    6 MZ31-3A12K107H265 10 250 200 500 265 1.8 13.5 5.0 0.6
    7 MZ31-3A10K15RH265 15 180 140 350 265 1.2 11.0 5.0 0.6
    8 MZ31-3A10K39RH265 39 130 100 250 265 1.2 11.0 5.0 0.6
    9 MZ31-3A08K15RH250 15 150 120 300 250 0.8 9.0 5.0 0.6
    10 MZ31-3A08K25RH265 25 130 100 250 265 0.8 9.0 5.0 0.6
    11 MZ31-3A08K35RH250 35 115 90 225 250 0.8 9.0 5.0 0.6
    12 MZ31-3A08K45RH265 45 105 80 200 265 0.8 9.0 5.0 0.6
    13 MZ31-3A08K55RH265 55 90 70 180 265 0.8 9.0 5.0 0.6
    14 MZ31-3A07K82RH265 82 70 50 140 265 0.6 8.0 5.0 0.6
    15 MZ31-3A07K56RH265 56 90 60 175 265 0.6 8.0 5.0 0.6
    16 MZ31-3A06K33RH250 33 110 85 200 250 0.4 7.0 4.5 0.6
    17 MZ31-3A05K70RH265 70 65 50 130 265 0.3 6.5 5.0 0.6
    18 MZ31-3A08P72RH220 72 90 70 180 220 0.6 10.0 5.0 0.6
    19 MZ31-3A05K85RH265 85 60 45 120 265 0.3 6.5 5.0 0.6

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