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  • New item   Industrial circuit breaker | MCCB | 3P | 400A | Icu 85kA | electronic | adjustable 160–400A, 1A steps | LCD display | Promfactor Baltic | FMC4Ei
    New item   Industrial circuit breaker | MCCB | 3P | 400A | Icu 85kA | electronic | adjustable 160–400A, 1A steps | LCD display | Promfactor Baltic | FMC4Ei 1
    New item   Industrial circuit breaker | MCCB | 3P | 400A | Icu 85kA | electronic | adjustable 160–400A, 1A steps | LCD display | Promfactor Baltic | FMC4Ei 2

    Industrial circuit breaker | MCCB | 3P | 400A | Icu 85kA | electronic | adjustable 160–400A, 1A steps | LCD display | Promfactor Baltic | FMC4Ei

    Code: FMC4Ei
    Inquire about this item
    Price 592.90 € VAT incl.
    ( 490.00 € VAT excl. )

    This is a high-quality three-pole molded case circuit breaker (MCCB) designed for low-voltage electrical network protection against overload, short circuit, and single-phase earth fault currents.
    Equipped with an integrated LCD display and an electronic control unit, this modern circuit breaker allows precise adjustment of protection parameters, real-time monitoring of current and voltage conditions, and ensures maximum electrical safety in industrial, commercial, and infrastructure applications.

    With wide configuration options, a high breaking capacity of up to 85 kA (415V), and compliance with IEC/EN 60947-2 standards, the FMC4Ei breaker is a reliable solution for main distribution boards, generators, transformers, and motor circuit protection. 

  • Product description

    Industrial circuit breaker MCCB – 3P, 400 A, Icu 85 kA, electronic, adjustable 160–400 A in 1 A steps, LCD, FMC4Ei

    FMC4Ei 3P 400 A– industrial moulded-case circuit breaker (MCCB) withelectronic microprocessor trip unit and LCD display, designed to protect low-voltage power distribution circuits against overload and short circuit.

    The nominal trip-unit current isIn = 400 A, while the long-time protection setting can be adjustedover the 160–400 A range in 1 A steps. This allows the protection parameters to be matched more precisely to the permissible continuous current of the cables, transformer or generator characteristics, load profile and selectivity requirements.

    Application for power engineers / designers:
    The circuit breaker is intended for main and secondary low-voltage distribution circuits where a 3-pole MCCB with high breaking capacity and adjustable electronic protection is required. It is suitable for incomers, bus-section feeders, transformer, generator, motor-group and other higher-power distribution circuits, provided its rated and protection parameters comply with the project calculations.
    Poles
    3P
    In
    400 A
    Long-time protection
    160–400 A / 1 A
    Icu @ 380/415 V
    85 kA
    Ics @ 380/415 V
    60 kA
    Standard
    IEC/EN 60947-2

    Protection functions and adjustment ranges

    Long-time protection current 160–400 A, in 1 A steps
    Long-time protection delay 12–150 s, in 1 s steps, with OFF function
    Lower short-circuit protection threshold 320–4800 A, in 1 A steps, with OFF function
    Short-circuit delay 0.06–1 s
    Higher short-circuit protection threshold 640–5600 A, in 1 A steps, with OFF function
    Pre-alarm threshold 112–400 A, in 1 A steps
    Practical significance:
    The electronic trip unit allows the protection characteristic to be coordinated not only by current but also by time. This is important for selectivity between the incomer and downstream circuit breakers, transformer inrush currents, motor starting conditions and thermal protection of cables.

    In, Icu and Ics – what do these parameters mean?

    In = 400 A– nominal current of the electronic trip unit. This is not necessarily the actual long-time protection setting because it can be adjusted over the 160–400 A range.

    Icu = 85 kA @ 380/415 V AC– ultimate short-circuit breaking capacity. The circuit breaker must be selected so that the calculated prospective short-circuit current at the installation point does not exceed its permitted breaking capacity.

    Ics = 60 kA @ 380/415 V AC– service short-circuit breaking capacity, important when assessing the circuit breaker's ability to remain in service after a standardized short-circuit test sequence.

    Important:
    85 kA is not a “protection current”. It is a short-circuit breaking-capacity rating. The operating protection current is set in the electronic trip unit according to the protected circuit.

    Technical specifications

    Product type Moulded-case circuit breaker (MCCB) with electronic trip unit
    Model FMC4Ei
    Number of poles 3P
    Nominal trip-unit current In 400 A
    Long-time protection range 0.4–1.0 × In / 160–400 A
    Adjustment step 1 A
    Rated operational voltage ~415 / ~690 V AC
    Rated insulation voltage Ui 800 V
    Rated impulse withstand voltage Uimp 8 kV
    Icu @ 380/415 V AC 85 kA
    Ics @ 380/415 V AC 60 kA
    Icu @ 690 V AC 17 kA
    Ics @ 690 V AC 12 kA
    Frequency 50/60 Hz
    Trip-unit type Electronic / microprocessor
    Display LCD
    Busbar connection Front or rear
    Tightening torque of bolted terminal connections 22 Nm
    Connection of optional accessories Yes
    Degree of protection IP20
    Operating temperature −25…+55 °C
    Storage temperature −25…+70 °C
    Maximum installation altitude 2000 m above sea level
    Electrical / mechanical endurance 1,000 / 4,000 cycles
    Standard IEC/EN 60947-2
    Warranty 5 years
    Declared service life not less than 15 years
    EAN 4823117812450

    Selection according to network short-circuit current

    An MCCB must not be selected solely on the basis of its 400 A nominal current. The designer must check theprospective short-circuit current Ikat the specific point in the switchboard and ensure that the selected circuit breaker's breaking capacity is sufficient.

    Example:
    if calculations at the terminals of a 400 V distribution board show a prospective short-circuit current of 42 kA, an 85 kA Icu class circuit breaker has sufficient ultimate breaking capacity. However, the final design must still consider Ics, selectivity, energy limitation, cable thermal withstand and coordination with upstream protection.

    Selectivity and protection coordination

    • Long-time protection currentis coordinated with the cable current-carrying capacity and the load.
    • Long-time protection delayis coordinated with downstream protection devices.
    • Lower short-circuit protection thresholdmay be used for time selectivity.
    • Higher short-circuit protection thresholdis intended for rapid interruption of high fault currents.
    • Pre-alarmcan be used to provide early warning of high load before the trip unit operates.
    Selectivity must be verified by calculation:
    The fact that the incomer is rated 400 A and a downstream breaker has a lower rating does not by itself guarantee selectivity. The time-current characteristics of both devices and the manufacturer's coordination data must be evaluated.

    Where is it appropriate to use?

    • Transformer substations– for protection of 0.4 kV outgoing feeders and main distribution circuits.
    • Main distribution boards– as an incomer or bus-section circuit breaker.
    • Generator systems– for generator output or distribution circuits.
    • Industrial facilities– for protection of high-power process lines and distribution circuits.
    • Motor group supplies– as higher-level protection of the supply circuit.
    • Commercial and infrastructure facilities– where an adjustable electronic MCCB with high short-circuit breaking capacity is required.

    Use according to application

    For power engineers:when the incomer protection must be accurately coordinated with the actual site load, cables and downstream circuit breakers.

    For designers:when a 400 A frame size is required, but the long-time protection setting must be below 400 A and selected precisely in 1 A steps.

    For operation and maintenance:the LCD display facilitates review of settings, states and diagnostic information and helps document the parameters.

    For modernization:the adjustable electronic trip unit provides additional flexibility if the load, cable parameters or network operating mode change in the future; however, every change must be recalculated and documented.

    Commissioning and setting checklist

    1. Verify the rated network voltage and frequency.
    2. Verify the calculated maximum short-circuit current at the installation point.
    3. Verify the permissible continuous current of the protected cable.
    4. Set the long-time protection current within the 160–400 A range.
    5. Set the long-time protection delay parameters.
    6. Set the short-circuit protection thresholds and delay.
    7. Verify selectivity with upstream and downstream protection devices.
    8. Verify the cross-sections and mechanical fastening of terminal connections and busbars.
    9. Tighten bolted terminal connections in accordance with the manufacturer's requirements – the specified torque is 22 Nm.
    10. Check the operation of auxiliary contacts / trip accessories if installed.
    11. Carry out the required insulation, continuity and other specified electrical tests.
    12. Document all electronic trip-unit settings in the operating documentation.
    Electrical safety requirement:
    Installation of the 400 A MCCB, setting of protection parameters, selectivity coordination and testing must be carried out by a qualified electrical specialist. Electronic trip-unit settings must be based on project calculations or protection coordination studies.

    Optional accessories and integration

    The FMC4Ei design allows optional devices to be connected. Auxiliary and alarm contacts and other accessories intended for this circuit-breaker series are available. The specific accessory must be checked for compatibility with the FMC4Ei frame size and the particular accessory version.

    Advantages

    • 400 A MCCB frame class.
    • 160–400 A long-time protection setting.
    • 1 A adjustment step.
    • Adjustable protection delay parameters.
    • Adjustable short-circuit protection.
    • LCD display.
    • 85 kA Icu @ 380/415 V.
    • 60 kA Ics @ 380/415 V.
    • Front or rear busbar connection.
    • Optional accessories available.
    • 5-year manufacturer's warranty.

    Limitations

    • The 3P version does not switch the neutral conductor.
    • IP20 – a suitable switchboard enclosure is required.
    • Protection settings must be calculated rather than selected empirically.
    • Icu and Ics decrease as the operating voltage increases up to 690 V.
    • Selectivity with other protective devices is not automatically guaranteed.
    • High-current circuits require proper design of busbars and terminal connections.

    Quick selection guide for power engineers

    FMC4Ei 3P 400 Ais suitable when:

    • a 3-pole MCCB up to 400 A is required;
    • the long-time protection must be set within the 160–400 A range;
    • a 1 A setting step is required;
    • up to 85 kA Icu breaking capacity is required in a 380/415 V network;
    • an electronic trip unit and adjustable delays are required;
    • an LCD display is required for settings and diagnostic information;
    • a main incomer, bus-section or other higher-power outgoing feeder of a distribution board is being designed.

    FAQ – technical questions

    Can a 400 A circuit breaker be set, for example, to 327 A?
    Yes. The long-time protection current is adjustable over the 160–400 A range in 1 A steps, so such a setting is technically possible. Its suitability must be justified by calculations for the protected circuit.
    Does Icu 85 kA mean that the circuit breaker trips only at 85 kA?
    No. 85 kA is the ultimate short-circuit breaking capacity, while the trip thresholds are set in the electronic trip unit at much lower current values.
    Is it suitable for a 690 V network?
    Yes, but at 690 V the manufacturer specifies a lower breaking capacity: Icu 17 kA and Ics 12 kA. Therefore, the actual short-circuit current in the specific network must be checked.
    Can it be used as a main incomer circuit breaker?
    Yes, provided the number of poles, rated current, breaking capacity, protection settings, busbar system and selectivity requirements comply with the design of the specific incomer.
    Is the LCD display a power network analyzer?
    No. The LCD is the control and diagnostic interface of the electronic trip unit. If the project requires certified energy metering, harmonic analysis, voltage-quality monitoring or detailed network analysis, a separate power-quality/network analyzer must be used.

    400 A MCCB for power systems – 85 kA Icu, electronic trip unit and 1 A adjustment step

    FMC4Ei 3P 400 A is intended for projects where not only the nominal current but also accurate protection coordination is important. Adjustable long-time, short-circuit and time-delay protection allows the circuit breaker to be coordinated with the specific electrical system.

    IEC/EN 60947-2, 3P, In 400 A, Ir 160–400 A, Icu 85 kA, Ics 60 kA @ 380/415 V, Ui 800 V, Uimp 8 kV, LCD, IP20– for industrial distribution equipment, transformers, generators and other high-power low-voltage circuits.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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