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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
  • 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
  • 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
  • 3P MCCB in 1-phase 2-wire circuit

    It is possible. Refer to the figure for connection as below. More Details >>

    • No:24811
    • Release Date:2019/04/09 15:18
  • 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
  • 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
  • Minimum operating voltage

    Use with 24V, 0.5A or more for AC and DC in normal use. If the breakers are used less than 24V, use with 6V, 1A or more. Moreover, regular inspection of is ... More Details >>

    • No:22401
    • Release Date:2018/08/31 14:33
  • MCCB 3P4W 3P use

    If switching of neutral pole is not needed, it is possible to use 3-pole MCCB for 3-phase 4- wire circuit. Generally, it is recommended to use 4-pole circuit... More Details >>

    • No:22385
    • 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
  • 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

1-10 of Total 49