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FAQ within [ Molded Case Circuit Breakers ]

1-10 of Total 49

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  • 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
  • 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
  • Cascade breaking

    It is a method which breaks short circuit current with both upstream and downstream circuit breakers. For example, in the case that short circuit current at ... More Details >>

    • No:22357
    • Release Date:2018/08/31 14:33
  • 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
  • Ambient temperature

    The range of ambient temperature is from -10 to 40 degree Celsius for not only MCCB but also including Earth Leakage Circuit breaker, Earth Leakage Relay and... More Details >>

    • No:22352
    • Release Date:2018/08/31 14:33
  • Short circuit current calculation sof...

    You can calculate that with MELSHORT 2 (Free of charge). More Details >>

    • No:22394
    • Release Date:2018/08/31 14:33
  • Interrupting ratings

    A circuit breaker must have interrupting ratings. These are classified as rated short-circuit breaking capacities in IEC 60947-2.e rated ultimate short-circu... More Details >>

    • No:22341
    • Release Date:2018/08/31 14:33
  • 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
  • Rating of a circuit breaker for trans...

    When making a transformer to energize, a large inrush current may flow. The circuit breaker is therefore required to prevent unwanted trip. The selection of ... More Details >>

    • No:22343
    • Release Date:2018/08/31 14:33
  • 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

1-10 of Total 49