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  • Scope of Application

    TXCM1Z Molded Case Circuit Breaker (16A~250A, 225A~400 amp or 400 amp~ 630A DC Circuit Breaker, PV DC MCCB) is used for low-voltage power generation, transmission and distribution lines of rated voltage of DC500V, 750V and 1000V, rated current of 16A~250A, 225A~400 amp or 400 amp~ 630A to provide isolation, overload and short circuit protection, DC MCCB can also be used for infrequent making and breaking of circuits under normal circumstances.
    The DC MCCB are widely used in photovoltaic power generation systems, wind power generation systems, roof building power generation systems, rail transit power distribution systems and infrastructure construction and other low-voltage DC generation, transmission and distribution application occasions.

    Two release methods

    Two release methods

    Protection function Frame size

    Rated current In (A)

    Short-circuit protection

    current setting Ir (A)

    Operation time

    Short circuit protection 

    TXCM1Z-250

    16-250

    10In

    Instantaneous operation

    TXCM1Z-400

    225-400

    10ln

    TXCM1Z-630

    400-630

    10ln

    Operating tolerance

    ±20%

    Thermal + electromagnetic release

    Protection function Frame size

    Rated current In (A)

    Short-circuit protection

    current setting Ir (A)

    Operation time

    Short circuit protection

    TXCM1Z-250

    16-250

    10In

    Instantaneous operation

    TXCM1Z-400

    225-400

    10ln

    TXCM1Z-630

    400-630

    10ln

    Operating tolerance

    ±20%

    Protection function

    Frame size

    Rated current In (A)

    Operating characteristics

    Overload protection All series 16~630

    According to I²t operation
    1.05In (Cold), no operation within 1h (In≤63A)
    1.3In (Hot), ≤1h operation (In≤63A)
    1.05In (Cold), no operation within 2h (In>63A)
    1.3In (Hot), ≤2h operation (In>63A)

    Altitude

    ● Altitude of TXCM1Z DC MCCB installation place in normal work is not more than 2000m.
    ● If you need to install it at an altitude of more than 2000m, which can be used according to the altitude factor derating table.

    Derating factor of altitude corresponds to the circuit breaker

    Altitude (m) 2000 3000 4000 5000
    Rated frequency withstand voltage U U U U
    Max operating voltage Ue Ue Ue Ue
    Rated operating current In 0.97In 0.93In 0.89In

    Temperature

    ● Can be used in the lowest temperature of -25℃, the highest temperature of +40℃.
    ● If they need to work at less than -25℃ or higher than +40℃, you can use them according to temperature compensation factor table.
    ● Consult with the manufacturer when using at less than -25℃ or more than +40℃.

    Ambient temperature changes in the temperature compensation factor table

    Ambient temperature
    Coefficient
    Model

    +40℃

    +45℃

    +50℃

    +55℃

    +60℃

    Derating factor Derating factor Derating factor Derating factor Derating factor
    -250 1In 0.96In 0.91In 0.87In 0.82In
    -400 1In 0.94In 0.87In 0.81In 0.73In
    -630 1In 0.93In 0.88In 0.83In 0.76In

    Note: The above derating factors are measured at current value equal to the frame rated current

    Humidity

    ● In the ambient air temperature of +40℃, atmospheric relative humidity can not exceed 50%, if the temperature is low, you can use it under high humidity conditions.
    ● The monthly average relative humidity of the wettest month is 90%, and the effect of condensation on the product surface should be considered.

    Pollution level

    ● Level 3

    Standards and certification

    International standard
    National standard
    Product standard G

    IEC 60947-1 (General rules)

    G

    B 14048.l

    IEC 60947-2 (Circuit breaker) G B 14048.2
    IEC 60947-3(Switch, Isolation) G B 14048.3
    Extreme environmental test standard

    IEC 60068-2-1

    G

    B/T 2423.l

    IEC 60068-2-2 G B/T 2423.2
    IEC 60068-2-11 G B/T 2423.17
    IEC 60068-2-30 G B/T 2423.4

    Main technical parameters

    Model of circuit breaker TXCM1Z-250 TXCM1Z-400 TXCM1Z-630
    Frame rated current (A) 250 400 630
    Electrical performance
    Pole (P) 3 4 3 4 3 4
    Rated current In (A)

    16/20/25/32/40/ SOI

    63/80/100/125/140/

    160/180/200/2251250

    225/250/315/350/400

    400/500/630

    Rated insulation voltage Ui (V) 1000 1000 1000
    Rated impulse voltage Uimp (V) 8000 8000 8000
    Rated operating voltage Ue (V) DC500 DC750 DC500 DC750 DC500 DC750
    DC750 DC1000 DC750 DC1000 DC750 DC1000
    Arcing distance (mm) ≤50 ≤100 ≤100

    Rated ultimate short-circuit

    breaking capacity Icu (kA)

    DC500V 65 - 65 - 65 -
    DC750V 40 50 40 50 40 50
    DC1000V - 40 - 40 - 40

    Rated operating short-circuit

    breaking capacity Icu (kA)

    DC500V

    100%Icu

    - 100%Icu - 100%Icu -
    DC750V 50%Icu 100%Icu 50%Icu 100%Icu 50%Icu 100%Icu
    DC1000V - 50%Icu - 50%Icu - 50%Icu

    Rated short-circuit making

    capacity Icm (kA)

    100%Icu 100%Icu 100%Icu
    Use category A A A
    Electrical life (times) 5000 1000 1000
    Mechanical life (times) Maintenance-free 10000 5000 5000
    Have maintenance 20000 10000 10000
    Connection and installation
    Outline dimensions (mm) Width (3P/4P) 107/142 150/198 182/240
    Length 165 257 270
    Height 104.5 104.5 108.5

    Time / current characteristic curve

    Time / current characteristic curve of TXCM1Z-250

    Time / current characteristic curve of TXCM1Z-400(including 400 amp DC Circuit Breaker)

    Time / current characteristic curve of TXCM1Z-630(including 400 amp DC Circuit Breaker)

    Wiring mode

    Wiring mode of circuit breaker in different voltage and different DC system

    Different power system / load wiring mode

    Rated operating voltage Power / load wiring mode
    Ungrounded system Negative grounded system Neutral point grounded system
    DC500V E - - - E - - - -
    DC750V E - - - - - - - H
    DC1000V - - - H - - - - H

    Note: (1) In the negative grounded system, the wiring must be according to the above table.
    (2) In the ungrounded system and the neutral point grounded system, use the wiring on the table. User page
    can exchange the positive and negative based on the actual situation, but also can exchange wiring position
    of the power supply and load.

    DC system applications

    Choosing circuit breakers in a DC system need to mainly consider the following aspects:
    ● Rated operating voltage, consider the breaking poles in series
    ● Rated current, consider the load power
    ● Breaking capacity, consider the max short-circuit current at the installation point

    System type Grounding system Ungrounded system
    Negative grounding neutral grounding
    Various fault types


    Fault effect Fault 1

    Produce max

    short-circuit current,

    contact connecting to

    the positivepole of

    the power supplyis off

    U/2 voltage produces

    the nearest max

    short-circuit current,

    contact connecting to the

    positive pole of the

    power supply is off

    No effect
    Fault 2

    Produce max

    short-circuit current,

    but the contacts in

    series are broken

    Produce max

    short-circuit current,

    but the contacts

    in series are broken

    Produce max

    short-circuit current,

    but the contacts in

    series are broken

    Fault 3 No effect

    The same as the fault I,

    but only for contacts

    connecting to the

    negative pole of

    the power supply

    No effect
    The worst situation Fault I Fault I and II Fault II
    Breaking poles situation

    Can be connected

    to the positive

    pole in series,
    carry out the

    breaking together

    For every pole,

    carry out the breaking

    of the maximum short-circuit

    current at U/2

    The poles carry out

    the breaking together

    Outline and installation dimension

    Front plate wiring of TXCM1Z-250 3-pole (mm)

    Front plate wiring of TXCM1Z-250 4-pole (mm)

    Front plate wiring of TXCM1Z-400 3-pole (mm)

    Front plate wiring of TXCM1Z-400 4-pole (mm)

    Front plate wiring of TXCM1Z-630 3-pole (mm)

    Front plate wiring of TXCM1Z-630 4-pole (mm)

    Type / Installation location /
    Poles / Accessory name
    TXCM1Z-250 TXCM1Z-400 TXCM1Z-630
    3P 4P 3P 4P 3P 4P
    Nothing - - -
    Shunt release
    Auxiliary contact
    Undervoltage release

    Shunt release
    Auxiliary contact

    Shunt release
    Undervoltage release

    Two sets of auxiliary contact

    Undervoltage release
    Auxiliary contact

    Auxiliary contact

    Alarm contact

    Shunt release
    Alarm contact

    Auxiliary contact
    Alarm contact

    Undervoltage release
    Alarm contact

    Shunt release
    Auxiliary+Alarm contact

    Two sets of auxiliary contact
    Alarm contact

    Undervoltage release
    Auxiliary+Alarm contact

    Quick sizing

    The cross-sectional area of the TXCM1Z connecting wire and the corresponding rated current

    Rated current (A) 10

    16

    20

    25 32

    40

    50

    63 80 100

    125

    140

    160

    180

    200,225

    250

    315

    350

    400
    Wire sectional area (mm²) 1.5 2.5 4 6 10 16 25 35 50 70 95 120 185 240
    Rated current (A) Cable Copper bar
    Sectional area (mm²) Quantity Size mmxmm Quantity
    500 150 2 30x5 2
    630,700 185 2 40x5 2
    800 200 2 40x5 2

    TXCM1Z 250 H P 3R 300


    Keywords: DC MCCB,400 amp dc Circuit Breaker

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