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China CBRM5KdE MCCB - Electronic Adjustable Circuit Breaker from Reliable Suppliers & Factory with High Breaking Capacity

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D&T CBRM5KD MCCB is a high-performance circuit breaker that features an ultra-compact design and exceptional breaking capacity, meeting IEC 60947-2 standards. As a trusted product from one of the leading Suppliers in China, it holds DEKRA certification for verified safety and reliable performance.

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With its innovative dual-cover design, the MCCB ensures live-part isolation, making accessory installation both safe and straightforward.

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Our advanced production Factory utilizes automatic screw fastening, precision laser marking, and fully automated testing systems. Each unit undergoes rigorous 100% automated testing on various parameters, including trip force, overtravel, contact gap, loop resistance, final contact pressure, power-frequency withstand voltage, and tripping characteristics, guaranteeing consistent quality and dependable operation.

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    Product Details

    Product Model & Description

    model explanation

    Four-Pole Product Codes

    Type A: N pole without overcurrent release element, and the N pole remains closed at all times and does not open or close with the other three poles.

    Type B: N pole without overcurrent release element, and the N pole opens and closes with the other three poles (the N pole closes first and opens later).

    Operating Environment

    Normal Operating Conditions

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    The upper limit of ambient air temperature shall not exceed +40°C, the lower limit shall not be lower than -5°C, and the average temperature within 24 hours shall not exceed +35°C.
    Note: When the ambient air temperature exceeds +40°C or falls below -5°C, the use of the circuit breaker should be subject to agreement with the manufacturer.

    ◆

    Installation altitude shall not exceed 2000 m.

    ◆

    The relative humidity of the atmosphere shall not exceed 50% at the maximum ambient temperature of +40°C. Higher relative humidity is allowed at lower temperatures (e.g., 90% at 20°C), with consideration given to condensation that may occur due to temperature changes on the product surface.

    Normal Installation Conditions

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    Installation category: Category Ⅲ for the main circuit, Category Ⅱ for the control and auxiliary circuits.

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    Installation orientation: Generally installed vertically (upright), but horizontal (flat-mounted) installation is also permissible.

    ◆

    Pollution degree: Degree 3.

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    External magnetic field: The external magnetic field in the installation location shall not exceed 5 times the geomagnetic field in any direction.

    Trip Unit Types & Accessory Codes

    Trip Unit Types
    Accessory Codes

    Main Technical Parameters

    Model CBRM5Kd-125i CBRM5Kd-160 CBRM5Kd-250 CBRM5Kd-400 / CBRM5Kd-630i CBRM5Kd-800
    Frame Size Current Inm(A) 125 160 250 400, 630 800
    Rated Current In(A) 10, 16, 20, 25, 30, 32, 40, 50, 63, 70, 75, 80, 90, 100, 125 16, 20, 25, 30, 32, 40, 50, 63, 70, 75, 80, 90, 100, 125, 140, 150, 160 100, 125, 140, 150, 160, 175, 180, 200, 225, 250 225, 250, 280, 300, 315, 350, 400, 500, 550, 630 630, 700, 800
    Number of Poles 3 4 3 4 3 4 3 4 3 4
    Rated Insulation Voltage Ui(V) 1000
    Rated Operation Voltage Ue(V) AC380, AC400, AC415 AC380, AC400, AC415, AC660, AC690
    Rated Impulse Withstand Voltage Uimp (kV) 8 12
    Arc Distance(mm) 50 100
    Breaking Capacity Level L M H L M H L M H L M H L M H
    Ultimate Short-Circuit Breaking Capacity Icu(kA) AC380V/AC400V/AC415V 10 18 36 25 36 50 36 50 70 50 70 100 50 70 100
    Service Short-Circuit Breaking Capacity Ics(kA) AC380V/AC400V/AC415V 10 18 36 25 36 50 36 50 70 50 70 100 50 70 100
    Ultimate Short-Circuit Breaking Capacity Icu(kA) AC660V/AC690V - - - 8 10 10 10 10 10 10 15 20 15 20 25
    Service Short-Circuit Breaking Capacity Ics(kA) AC660V/AC690V - - - 8 10 10 10 10 10 10 15 20 13 15 20
    Number of operating cycles With current 4000 4000 4000 1000 500
    Without current 10000 10000 10000 4000 2500
    Total 14000 14000 14000 5000 3000

    Protection Characteristics

    For Distribution Applications

    Rated Current (A) Thermal Trip Unit (Ambient Temp +40°C) Magnetic Trip Unit Operating Current (A)
    1.05In (Cold State) Non-Tripping Time (h) 1.3In (Hot State) Tripping Time (h)
    10 ≤ In ≤ 63 No Tripping Within 1 hour ≤ 1 10In ± 20%
    160 Frame, 16-32A: 400A ± 20%
    63 < In ≤ 800 No Tripping Within 2 hours ≤ 2

    For Motor Protection

    Rated Current (A) Thermal Trip Unit (Ambient Temp +40°C) Magnetic Trip Unit Operating Current (A)
    1.0In (Cold State) Non-Tripping Time (h) 1.2In (Hot State) Tripping Time (h) 1.5In (Hot State) Tripping Time (h) 7.2In (Cold State) Tripping Time (h) Trip Level
    10 ≤ In ≤ 25 No Tripping Within 2 hours ≤ 2 ≤ 2min 0.5s < Tp ≤ 5s 5 12In ± 20%
    160 Frame, 16-32A: 400A ± 20%
    25 < In ≤ 250 ≤ 4min 4s < Tp ≤ 10s 10
    250 < In ≤ 800 ≤ 8min 6s < Tp ≤ 20s 20

    Circuit Breaker Classification

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    By Number of Poles: Three-Pole, Four-Pole

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    By Application: For Distribution, For Motor Protection

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    By Operating Method: Direct Handle Operation, Electric Operation (indicated by "p"), Rotary Handle Operation for Switchgear (indicated by "Z")

    Frequently Asked Questions

    Q1: What is the difference between Type A and Type B four-pole circuit breakers?
    Type A features an N pole without an overcurrent release element that remains closed at all times and does not operate with the other three poles. Type B also lacks an overcurrent release element on the N pole, but it opens and closes in synchronization with the other three poles (closing first and opening later).
    Q2: What are the ambient temperature limits for operating this circuit breaker?
    The ambient air temperature must be between -5°C and +40°C, and the average temperature over a 24-hour period should not exceed +35°C. For operation outside these limits, please consult the manufacturer.
    Q3: Can the circuit breaker be installed horizontally?
    Yes, while the circuit breaker is generally installed vertically (upright), horizontal (flat-mounted) installation is also permissible.
    Q4: What is the maximum installation altitude for normal operating conditions?
    The installation altitude for the circuit breaker must not exceed 2000 meters.
    Q5: What do the codes "p" and "Z" stand for in the operating methods?
    The letter "p" indicates electric operation, and the letter "Z" indicates rotary handle operation designed for switchgear.
    Q6: What is the pollution degree rating of the installation environment?
    The circuit breaker is designed for environments with a Pollution Degree of 3.

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