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China Suppliers Factory CBRM5KdE Electronic Adjustable MCCB Circuit Breaker with High Breaking Capacity

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The D&T CBRM5KD MCCB is a highly efficient circuit breaker that combines an ultra-compact design with a high breaking capacity. This reliable product complies with IEC 60947-2 standards and has received DEKRA certification, ensuring verified safety and performance. As a proud China supplier, we prioritize quality and compliance.

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Equipped with a dual-cover design, the CBRM5KD ensures safe isolation of live parts, making accessory installation both safe and straightforward. Our state-of-the-art factory utilizes advanced automatic screw fastening, precision laser marking, and fully automated testing systems for optimal production efficiency.

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Every unit of our MCCB undergoes rigorous 100% automated testing, which includes assessments of trip force, overtravel, contact gap, loop resistance, final contact pressure, power-frequency withstand voltage, and tripping characteristics. This thorough testing process guarantees consistent and reliable operation for all our customers. Choose us as your trusted China suppliers for high-quality circuit breakers.

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    Product Details

    Product Model & Description

    Product Model and Description
    • Four-Pole Product Codes
    • Type A: The N pole is not equipped with an overcurrent release and remains permanently connected; it does not open or close together with the other three poles.
    • Type B: The N pole is not equipped with an overcurrent release but opens and closes together with the other three poles (N pole closes first and opens last).

    Operating Environment

    Normal Operating Conditions
    • 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
    • Installation category: Category Ⅲ for the main circuit, Category Ⅱ for the control and auxiliary circuits.
    • Installation orientation: Generally installed vertically (upright), but horizontal (flat-mounted) installation is also permissible.
    • Pollution degree: Degree 3.
    • 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 1Trip Unit Types & Accessory Codes 2

    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) 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 25 25 36 50 36 50 70 50 70 100 50 70 100
    Service Short-Circuit Breaking Capacity Ics(kA) AC380V/AC400V/AC415V 10 18 25 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 20
    Service Short-Circuit Breaking Capacity Ics(kA) AC660V/AC690V - - - 4 5 5 5 5 5 10 15 15 13 15 15
    Operating Performance (operations) Energized 1500 1500 1000 1000 500
    De-energized 8500 8500 7000 4000 2500
    Total 10000 10000 8000 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 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 ≤ 4min 4s < Tp ≤ 10s 10
    250 ≤ 8min 6s < Tp ≤ 20s 20

    Circuit Breaker Classification

    • By Number of Poles: Three-Pole, Four-Pole
    • By Application: For Distribution, For Motor Protection
    • By Operating Method: Direct Handle Operation, Electric Operation (indicated by "p"), Rotary Handle Operation for Switchgear (indicated by "Z")

    Frequently Asked Questions (FAQ)

    Q1: What is the difference between Type A and Type B four-pole circuit breakers?
    A: For Type A, the N pole does not have an overcurrent release, is permanently connected, and does not open/close with the other poles. For Type B, the N pole also lacks an overcurrent release but opens and closes together with the other three poles (closing first and opening last).
    Q2: What are the normal ambient operating temperature limits?
    A: The ambient air temperature should be between -5°C and +40°C, with a 24-hour average temperature not exceeding +35°C. For operations outside this range, please consult the manufacturer.
    Q3: What is the maximum installation altitude for these circuit breakers?
    A: The standard installation altitude for these circuit breakers should not exceed 2000 meters.
    Q4: How does relative humidity affect the operation of the device?
    A: Relative humidity should not exceed 50% at a maximum temperature of +40°C. Higher humidity is permissible at lower temperatures (e.g., 90% at 20°C). Special attention should be paid to condensation caused by temperature fluctuations.
    Q5: What are the available operating methods?
    A: These circuit breakers support three operating methods: Direct Handle Operation, Electric Operation (marked as "p"), and Rotary Handle Operation designed for switchgear (marked as "Z").
    Q6: What installation orientations are permitted for these circuit breakers?
    A: They are generally designed to be installed vertically (upright), but horizontal (flat-mounted) installation is also fully permissible.

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