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

  • Functional characteristics
  • Function:PTC thermistor for transformer overcurrent,overvoltage protection
    Model number:MZ31 series MZ4,MZ6,MZ8,MZ8E,MZ9,MZ11 etc.

    Brief Introduction:
    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.

    PTC thermistor applications on transformer:
    Primary overvoltage protection overload protection and overcurrent protection of transformer,adapter
    PTC thermistor for transformer overvoltage protection applicationapplication of PTC thermistor for transformer overvoltage protection

    Working principle of  PTC thermistor on transformer:
    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.
    PTC thermistor for transformer overvoltage protection working principle

    Advantages:
    1.Automatic circuit protection,can resume steadily after circuit protection,
    2.Contactless,noiseless and flameless;
    3.Has complete specification
    4.Reacts fast
    5.Long stability
    6.With a better performance of overvoltage protection,
    suitable for operating in 250/265V AC (high resistance state) continuously
    7.small steady resistance;
    8.low rated current.
    9.RoHS compliant.

    Choose guidelines of PTC thermistor for protection of overcurrent and overload:
    In selecting PTC thermistor as 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:
    Part number of PTC thermistor for transformer overvoltage protection
    1.Series:PTC thermistor for transformer 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):
    dimension of PTC thermistor for transformer overvoltage protection

    Specification&Part No.:

    Transformer overcurrent and overload protection (PTC thermistor embeded in transformer wire coil)

    Item Part No. Resistance
    R 25(Ω)
    Non-trip current
    Int(mA)
    Tripcurrent
    @25℃
    It(mA)
    Max.
    operating voltage
    V max  (V)
    Max.
    current
    I m a x ( A )
    Curie temperature
    T c (℃)
    Dimension
    (mm)
    @25℃ @40℃ D max T max Φd
    1 MZ31-3A10N12RH265 12 170 95 340 265 1.5 100 11.0 5.0 0.6
    2 MZ31-3A12N12RH265 12 210 120 420 265 2.0 13.5 5.0 0.6
    3 MZ31-3A10N18RH265 18 145 80 290 265 1.5 11.0 5.0 0.6
    4 MZ31-3A12N18RH265 18 180 100 360 265 2.0 13.5 5.0 0.6
    5 MZ31-3A10N22RH265 22 125 70 250 265 1.5 11.0 5.0 0.6
    6 MZ31-3A07N22RH265 22 110 60 220 265 0.7 8.0 4.5 0.6
    7 MZ31-3A08N25RH265 25 110 60 220 265 1.2 9.5 5.0 0.6
    8 MZ31-3A08N30RH265 30 100 55 200 265 1.0 9.0 5.0 0.6
    9 MZ31-3A07N32RH265 32 95 50 190 265 0.7 8.0 4.5 0.6
    10 MZ31-3A08N35RH265 35 90 50 180 265 1.0 9.0 5.0 0.6
    11 MZ31-3A08N39RH265 39 95 50 180 265 1.2 9.5 5.0 0.6
    12 MZ31-3A08N40RH265 40 85 45 170 265 1.0 9.0 5.0 0.6
    13 MZ31-3A07N55RH265 55 70 40 140 265 0.7 8.0 5.0 0.6
    14 MZ31-3A05N121H265 120 45 25 90 265 0.4 6.5 5.0 0.6
    15 MZ31-3A05N151H265 150 38 20 80 265 0.4 6.5 5.0 0.6

    Transformer overcurrent and overload protection (PTC thermistor not embeded in transformer wire coil)

    Item Part No. Resistance
    R 25(Ω)
    Non-trip current
    Int(mA)
    Tripcurrent
    @25℃
    It(mA)
    Max.
    operating voltage
    V max  (V)
    Max.
    current
    I m a x ( A )
    Curie temperature
    T c (℃)
    Dimension
    (mm)
    @25℃ @40℃ D max T max Φd
    1 MZ31-3A16P6R0H265 6.0 390 300 780.0 265 3.1 120 17.5 5.0 0.6
    2 MZ31-3A13P10RH265 10 260 200 520 265 1.8 14.0 5.0 0.6
    3 MZ31-3A12P10RH265 10 250 200 500 265 1.8 13.5 5.0 0.6
    4 MZ31-3A08P25RH265 25 130 100 250 265 0.8 9.0 5.0 0.6
    5 MZ31-3A08P45RH265 45 105 80 200 265 0.8 9.0 5.0 0.6
    6 MZ31-3A08P55RH265 55 90 70 180 265 0.8 6.5 5.0 0.6
    7 MZ31-3A05P70RH265 70 65 50 130 250 0.3 6.5 5.0 0.6
    8 MZ31-3A03P151H250 150 40 30 75 250 0.2 4.5 5.0 0.5

    Notes:
    1.Wire shape form can be selected per using condition.
    2.R 25 resistance tolerance can be selected per customer’s requirement.
    3.Packing can be made per customer’s requirement.

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