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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
  • 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
  • Switch disconnector

    Switch disconnector is a switch compatible with IEC 60947-3 standard, and it has no overcurrent tripping element. Please use it as a switch with large switch... More Details >>

    • No:22379
    • 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
  • 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
  • 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
  • Max. operational voltage for AC/DC Co...

    When it is connected as special connection, AC/DC compatible circuit breaker can be used with DC 250V or more (3-pole type is DC400V and 4-pole type is DC500... More Details >>

    • No:22445
    • Release Date:2018/08/31 14:33
  • Rear stud (B-ST) installed

    B-ST is possible. More Details >>

    • No:24814
    • Release Date:2019/04/09 15:17
  • 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
  • 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

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