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FAQ within [ Molded Case Circuit Breakers ]

1-10 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
  • 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
  • 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
  • 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
  • Inverse time delay operating characte...

    It is a characteristic that operating time inversely become shorter as current increases. For Molded Case Circuit Breakers, protection characteristic meeting... More Details >>

    • No:22387
    • 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
  • 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
  • lower limit of operational voltage fo...

    It is DC 24V. More Details >>

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