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FAQ within [ Molded Case Circuit Breakers ]

1-10 of Total 49

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  • Setting change operation while power ...

    It is forbidden to change the characteristic when the breaker ON. Over current trip and earth leakage trip characteristics should be changed by a person with... More Details >>

    • No:37699
    • Release Date:2020/01/18 09:58
  • Electronic MCCB 400-1600A How to ch...

    First, turn OFF the upstream circuit breaker and the relevant circuit breaker. You must not work in the state where voltage is applied to the relevant circui... More Details >>

    • No:22439
    • Release Date:2018/08/31 14:33
    • Update:2018/08/31 14:35
  • Degree of protection

    In order to prevent breakdowns and human injuries, it is necessary to select a control device having protection structure suitable for each purpose. The prot... More Details >>

    • No:22443
    • Release Date:2018/08/31 14:33
  • Calorific value of the circuit breaker

    1. The internal resistance (per pole) is described in the catalog and technical notes. 2. Power consumption (W) = RI^2 x Poles = Resistance (Ω) x Load curre... More Details >>

    • No:38025
    • Release Date:2021/01/22 17:39
  • How to fix conductors/wires

    Large electromagnetic force will be generated between conductors/wires due to fault currents. To prevent deformation and breakage of circuit breakers and con... More Details >>

    • No:22424
    • 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
  • 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
  • AC Breakers used at DC circuit

    It is not possible to use a circuit breaker for AC in DC circuit. Since the Arc-Extinguishing Device structure of circuit breaker for DC is different from th... More Details >>

    • No:22381
    • Release Date:2018/08/31 14:33
  • 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
  • MCCB Reverse connection

    Almost MCCBs can be connected n reverse. Check the item column of specification table "reverse connection" in the catalog. If it says "Possible", MCCB can be... More Details >>

    • No:22442
    • Release Date:2018/08/31 14:33

1-10 of Total 49