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FAQ within [ Molded Case Circuit Breakers ]

21-30 of Total 49

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  • IEC60947-2 standard

    IEC 60947-2 is an international standard for circuit breakers. The rated voltage for the applicable circuit breaker is 1000V AC or less, or DC 1500V DC or le... More Details >>

    • No：22361
    • Release Date：2018/08/31 14:33

  • 2P MCCB only 1-pole use

    No, you must not use 2-pole circuit breaker as 1-pole circuit breaker (series connection as only single phase ). If using it as 1-pole circuit breaker, these... More Details >>

    • No：22382
    • Release Date：2018/08/31 14:33

  • Hot start characteristics

    Operating characteristics described in our catalog (if there is no "Note" particularly) mean operating time when it starts to carry current from the conditio... More Details >>

    • No：22374
    • Release Date：2018/08/31 14:33

  • MCCB bar terminal material

    Bar terminal material for 400A is aluminum alloy, and for 630A or higher is copper. More Details >>

    • No：24819
    • Release Date：2019/04/09 15:13

  • How to connect to 2-pole breaker

    (1) When "N" is marked on the breaker,connect the N phase wire as marked. (2) When "N" is not marked on the breaker, N phase wire can be connected to eith... More Details >>

    • No：37700
    • Release Date：2020/01/17 08:58

  • lower limit of operational voltage for DC

    It is DC 24V. More Details >>

    • No：24816
    • Release Date：2019/04/09 15:17

  • LTD operating characteristic

    It is overcurrent tripping characteristic zone which exceeds the rated current and does not exceed short time tripping zone (If without short time tripping ,... More Details >>

    • No：22384
    • Release Date：2018/08/31 14:33

  • Operating cycles

    It is the number that can be opened/closed per hour under the conditions specified in the standard. More Details >>

    • No：22436
    • Release Date：2018/08/31 14:33

  • Selective coordination

    It is a protection method which only trips the related circuit breaker and other fault-free circuit does not trip and continues power supply in the event of... More Details >>

    • No：22366
    • Release Date：2018/08/31 14:33

  • MCCB, ELCB and ACB at higher altitudes

    In that case, the rated current and the rated voltage shall be reduced. Refer to the table of derating factors as below. More Details >>

    • No：24801
    • Release Date：2019/04/09 15:17

21-30 of Total 49

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