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

  • Functional characteristics
  • Brief Introduction of PTC thermistor for Meter instrument overvoltage protection :
    MZ31 series of 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. It can replace traditional fuse and widely applied in overvoltage protection and overload protection of motor, transformer, electronic circuit. PTC thermistor decreases its residual current through sharp resistance increasing, restraining consumption of the whole line,and it can restore its protective function after the trouble was removed.But traditional fuse could not restore after fusing in the circuit.

    Applications of thermistor ptc for meter instrument overvoltage protection :
    Overvoltage protection,overload protection of Electronic meter and instrument,multimeter, kilowatt-hour meter and Electronic circuit.
    application of PTC thermistor for Meter instrument overvoltage protection

    Working principle of thermal resistor for meter instrument overvoltage protection:
    As indicated in Fig 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.
    working principle of PTC thermistor for meter instrument

    Advantages:
    1.Automatic circuit protection,can resume steadily after circuit protection,
    2.Contactless,noiseless and flameless;
    3.Reacts fast
    4.Long stability
    5.With a better performance of overvoltage protection,
    suitable for operating in 265/420/550V AC (high resistance state) continuously
    6.RoHS compliant.

    Choose guidelines :
    In selecting PTC thermistor as overvoltage 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.

    Marking of Part Number:
    PTC thermistor part number used for meter instrument protection
    1.Series:PTC thermistor for overvoltage protection,overload protection
    2.Type:1-disc,2-encased,3-pin form-coating,4-pin form non-coating,5-SMD
    3.Type:Voltage level:H-550/420/265/250V M-140V L-30/60V
    4.Chip size: 08-Φ8mm 09-Φ9mm 11-Φ11mm
    5.Curie temperature: F-50℃ H-80℃ 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:265-265V 550-550V
    9.Wire shape: S-Straight, A-Axis formed, U-In-formed

    Dimension(Unit: mm):
    dimension of PTC thermistor for meter instrument protection

    Specification&Part No.:

    Item Part No. Resistance  
    R 25(Ω) 
    Non-trip current
    Int(mA)
    Tripcurrent
    @25℃ 
    It(mA) 
    Max.
    current
    I m a x ( A )
    Max. operating
    voltage
    V max  (V) 
    Curie temperature
    T c (℃)  
    Dimension
    (mm) 
    @25℃ @60℃ D max   T max   Φd 
    1 MZ31-3H05P152N550 1500 ·12 9 24 0.1 550 120(P) 6.5 5.0 0.6
    2 MZ31-3H05P122N550 1200 15 10 30 0.1 550 6.5 5.0 0.6
    3 MZ31-3H05P601N420 600 20 16 39 0.2 420 6.5 5.0 0.6
    4 MZ31-4H08P501N550 500 24 19 48 1.0 550 8.5 7.0 0.6
    5 MZ31-4H08P151N420 150 43 35 86 1.4 420 8.5 7.0 0.6
    6 MZ31-4H08P121N420 120 49 40 97 1.4 420 8.5 7.0 0.6
    7 MZ31-4H08P70RN420 70 64 50 127 1.4 420 8.5 7.0 0.6
    8 MZ31-3H05P65RN265 65 70 60 140 0.4 265 6.5 5.0 0.6
    9 MZ31-3H05P39RN265 39 85 70 170 0.4 265 6.5 5.0 0.6
    10 MZ31-3H05N751N420 750 25 20 45 0.2 420 100(N) 6.5 5.0 0.6
    11 MZ31-3H03N401N265 400 25 20 45 0.2 265 4.5 5.0 0.5
    12 MZ31-3H03N151N265 150 30 25 60 0.2 265 4.5 5.0 0.5
    13 MZ31-3H05H312N420 3100 5 4 13 0.1 420 80(H) 6.5 5.0 0.6
    14 MZ31-3H05H232N420 2300 8 6 17 0.1 420 6.5 5.0 0.6
    15 MZ31-3H03H152N265 1500 7 5 15 0.1 265 4.5 5.0 0.5
    16 MZ31-3H07H112M550 1100 15 10 30 0.5 550 8.0 7.0 0.6
    17 MZ31-3H03H102N265 1000 10 7 20 0.1 265 4.5 5.0 0.5
    18 MZ31-3H05H601N420 600 20 16 40 0.2 420 6.5 5.0 0.6
    19 MZ31-3H07H251N265 250 25 20 50 0.5 265 8.0 5.0 0.6
    20 MZ31-3H03H151N265 150 20 15 50 0.2 265 4.5 5.0 0.5
    21 MZ31-3H04H45RN265 45 40 30 80 0.3 265 5.5 5.0 0.6
    22 MZ31-3H08H12RN265 12 120 70 220 0.8 265 9.0 5.0 0.6

    Note:
    1. R 25 resistance tolerance can be selected per customer’s requirement.
    2. Encapsulation mode can be made per customer’s requirement.
    3. Wire shape kinked form can be selected.

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