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    250A 3P Molded Case Circuit Breaker

    250 amp 3 pole molded case circuit breaker at lower price, easy to install. It is capable of protecting the system against short circuit current up to 50kA. It has 1500 times' electrical life and 8500 times' mechanical life .
    SKU: ATO-MCCB-ABE-203b
    Free Shipping Worldwide
    Delivery date: 6-12 days

    Molded Case Circuit Breaker Information

    • Model: ATO-ABE-203b
    • Rated Current: 250 amp
    • Rated Voltage: 380/415V AC, 50Hz/ 60Hz
    • Number of poles: Three pole
    • 50 kA short circuit interrupting capacity


    Standard Certifications IEC60947 GB14048
    Electrical Parameters Model ATO-ABE-203b
    Rated Current 10A, 15A, 20A, 30A, 40A, 50A, 60A, 75A, 100A
    Numbers of Poles 3 Pole
    Rated Operating Voltage 400V
    Rated Insulated Voltage(Ui) 800V
    Rated Frequency 50Hz/60Hz
    Ultimate Short Circuit Breaking Capacity, Icu DC 125V 15kA
    250V 10kA
    AC 50Hz/60Hz 230V 35kA
    380V 18kA
    415V 18kA
    440V 18kA
    480V 10kA
    600V 7.5kA
    Mechanical Parameters Electrical Life 1500 times
    Mechanical Life 8500 times
    Protection Degree IP20
    Operating Temperature -25℃~+50℃
    Weight 1.5kg
    Color White

    Dimension (Unit: mm)

     Diemension of molded case circuit breaker      Diemension of molded case circuit breaker 1 Diemension of molded case circuit breaker 2     

    Model Dimensions Mounting Dimensions
    C C1 E F G G1 H H1 H2 H3 H4 H5 L L1 L2 W W1 W2 A B Φd
    ATO-ABE-203b 102 154 50 22 23 10 86 110 24 5 4 4.5 165 215 144 120 42 140 38 168 7

    Tips:  The Characteristics of Molded Case Circuit Breaker.

    1. Current limiting and breaking capacity

    When the circuit breaker is short-circuited, the contacts quickly open to produce an arc, which is equivalent to inserting a rapidly increasing arc resistance in the line, thus limiting the increase of the fault current. The shorter the opening time of the circuit breaker, the closer Ics is to Icu, and the better the current limiting effect. It can also greatly reduce the electromagnetic effect, electric effect and thermal effect caused by short-circuit current on the circuit breaker and electrical equipment, and prolong the circuit breaker's service life.

    2. Short circuit protection
    Short-circuit protection is the instantaneous tripping of short-circuit. Pay attention to adjusting the protection setting value in time after the load changes, to prevent the setting value from being too small and frequent tripping that affects the quality of power supply, or the setting value is too high to prevent effective protection of lines and equipment.

    3. Overload delay protection
    Overload delay protection means that the load current exceeds the limit of the equipment and there is a danger of burning the equipment. The protection device can cut off the power supply within a certain period of time. Overload has a process of heat accumulation, and the protection action does not need to be too fast. For short-time overcurrent, the protection should not act.

    4. Isolation function
    The isolation function is to require that the leakage current after the circuit breaker is disconnected will not cause harm to people and equipment. After multiple short-circuit trips, the performance of the switch will decrease and the leakage current will increase. For the human body, a leakage current of less than 30mA is a safe leakage current, and in a harsh environment, a leakage current exceeding 300mA for more than 2 hours may cause a phase-to-ground short circuit due to insulation damage and cause a fire.

    5. Leakage Protection
    There are two types of leakage devices, thermal magnetic type and electronic type. In comparison, electronic leakage devices have the advantages of small size, high precision and high sensitivity, but their anti-interference ability is poor. At present, electronic leakage protectors dominate the mainstream. When the leakage current reaches the set value, the executive circuit receives the induced voltage signal on the secondary side of the zero-sequence current transformer, drives the conversion contact to output the leakage protection signal, and causes the trip unit to act and cut off the power supply.


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