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China SJKM8 MCCB Suppliers | 100A to 630A Moulded Case Circuit Breaker Factory for Reliable Circuit Protection

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The SJKM8 Moulded Case Circuit Breaker (MCCB) is a high-performance solution for circuit protection in China, suitable for both 50Hz and 60Hz systems with insulation ratings up to 690V and current capacities ranging from 100A to 630A. This MCCB is available in various configurations including 1P, 2P, 3P, and 4P, making it a versatile choice for any panel integration. As one of the leading suppliers in the industry, we ensure that the SJKM8 MCCB adheres to IEC60947-2 and EN60947-2 standards, providing robust performance for industrial and commercial applications. Designed for optimal overload and short-circuit protection, this product is perfect for power distribution systems that demand high breaking capacity. Its compact design allows for space-saving installations without compromising on superior arc-quenching performance, making it an ideal choice for customers looking for reliable products from a reputable factory.

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    Product Details

    Type Designation
    SJKM8-Moulded-Case-Circuit-Breaker-6
    1 Manufacturer Code
    2 Molded Case Circuit Breaker Code
    3 Design Code
    4 Frame Size
    5 Short-Circuit Breaking Capacity Level 4
    6 Operation method 3
    7 Number of Poles 2
    8 Trip Unit Method & File Code
    Technical Parameters
    SJKM8 Series Circuit Breaker SJKM8-100 SJKM8E-160/250 SJKM8-160/250 SJKM8-400 SJKM8-630
    Pole Number 1,2,3,4 3 3,4 3,4 3,4
    Control Manual Toggle handle ■ ■ ■ ■ ■
    Direct or extended rotary handle ■ ■ ■ ■ ■
    Type Fixed Front connection ■ ■ ■ ■ ■
    Rear connection - ■ ■ ■ ■
    Plug-in Front connection ■ ■ ■ ■ ■
    Rear connection - ■ ■ ■ ■
    Electrical performance complies with IEC 60947-2 and EN 60947-2 standards
    Rated Current (A) In 40℃ 100 160/250 160/250 400 630
    Rated Insulation Voltage(V) Ui 690 690 690 690 690
    Rated Impulse Withstand Voltage (kV) Uimp 6 6 6 6 6
    Rated Working Voltage (V) Ue AC 50/60Hz 500 500 500 500 500
    Circuit Breaker Type N H N H N H N H N H
    Ultimate Breaking Capacity (kA rms) Icu AC 50/60Hz 220/240V 50 65 50 85 50 85 85 100 85 100
    380/400V 25 35 25 36 25 36 36 50 36 50
    415V 25 30 25 36 25 36 36 50 36 50
    440V 20 20 20 25 20 25 36 50 36 50
    500V 10 10 8 10 8 10 20 36 20 36
    Service Breaking Capacity (kA rms) lcs AC 50/60Hz 220/240V 25 30 25 43 25 43 43 50 43 50
    380/400V 13 17 13 18 13 18 18 25 18 25
    415V 7 7 13 18 13 18 18 25 18 25
    440V 5 5 10 13 10 13 18 25 18 25
    500V 3 3 4 5 4 5 10 18 10 18
    Isolation Function ■ ■ ■ ■ ■
    Application Category A A A A A
    Maximum Expected Maintenance Value (C-O Cycle) Mechanical 8500 10000 10000 6000 6000
    Electrical 440V In 4000 5000 5000 1000 1000
    Protection
    Release Thermo-magnetic Thermo-magnetic Thermo-magnetic Thermo-magnetic Thermo-magnetic
    Overload Protection Long-time Delay Ir(In×…) ■ ■ ■ ■ ■
    Short-Circuit Protection Short-time Delay Isd(In×…) - - - - -
    Instantaneous li(In× ·) ■ ■ ■ ■ ■
    Leakage Protection Circuit Breaker with Complete Leakage Protection - - ■ ■ ■
    Vigirex Relay ■ ■ ■ ■ ■
    Indication and Control Auxiliaries
    Auxiliary Contact (FZ) and Alarm Contact (BJ) ■ ■ ■ ■ ■
    Auxiliary Alarm Contact (FZ/BJ) ■ ■ ■ ■ ■
    Shunt Trip Coil (FL) ■ ■ ■ ■ ■
    Under-Voltage Coil (QY) ■ ■ ■ ■ ■
    Modbus Communication
    Pm200 Meter Electrical Measurement (Current, Voltage, Power, Energy) ■ ■ ■ ■ ■
    Mc Multi-Circuit Monitoring Unit Status ■ ■ ■ ■ ■
    Electrical Measurement (Current, Voltage) ■ ■ ■ ■ ■
    Installation
    Accessories Terminal Expansion and Extension ■ ■ ■ ■ ■
    Terminal Cover ■ ■ ■ ■ ■
    Phase Separator ■ ■ ■ ■ ■
    Circuit Breaker Type N/H N/H N/H N/H N/H
    Dimensions (mm) W×H×D Fixed Front Connection 1P 25×130×60 - - - -
    Fixed Front Connection 2P 50×130×60 - - - -
    Fixed Front Connection 3P 75×130×60 105x165x60 105x165×68 140x257x103 140×257x103
    Fixed Front Connection 4P 100×130×60 - 140x165x68 185×257x103 185x257x103
    Weight (kg) Fixed Front Connection 1P/2P 0.28/0.48 - - - -
    Fixed Front Connection 3P/4P 0.78/1.0 1.3 1.6/2.1 6.05/7.9 6.5/8.7
    Product Display
    SJKM8-MCCB-(5)
    SJKM8-Moulded-Case-Circuit-Breaker-(1)
    SJKM8-Moulded-Case-Circuit-Breaker-(2)
    SJKM8-Moulded-Case-Circuit-Breaker-(3)
    SJKM8-Moulded-Case-Circuit-Breaker-(4)
    SJKM8-Moulded-Case-Circuit-Breaker-(5)
    Ambient Temperature
    SJKM8-100~630
    Rated current Environmental temperature
    (A) 40℃ 45℃ 50℃ 55℃ 60℃ 65℃ 70℃
    15 15.7 15.3 15 14.7 4.6 14.2 13.8
    20 20.4 20.2 20 19.9 192 18.9 16.5
    25 25.7 25.3 25 24.7 24.5 24.3 24.0
    30 314 30.7 30 294 29.1 28.5 28.0
    40 40.9 404 40 39.5 38.0 376 37.1
    50 52.1 510 50 49.3 48.1 473 46.6
    60 61.8 60.9 60 59.0 57.5 56.6 55.7
    75 76.8 759 75 73.5 70.4 698 69.1
    80 82.2 811 80 78.5 77.3 75.7 76.1
    100 103 101 100 992 94.2 93.5 92.7
    100 106.8 103.5 100 96.4 92.7 88.8 84.7
    125 134.9 130 125 1198 114.3 108.5 102.5
    160 170.9 165.5 160 154.3 148.3 142.1 135.6
    175 175 168 161 154 146 138 126
    200 215 2076 200 192 183.8 175.1 165.9
    225 243.5 234.5 225 215.1 204.8 193.9 1823
    250 270.6 260.5 250 239 2275 2154 2026
    250 268 260 250 240 228 218 208
    320 342 333 320 307 291 278 266
    350 375 364 350 336 319 305 291
    400 428 416 400 384 364 348 332
    400 400 390.5 381 3714 3619 349.2 339.7
    500 500 488.1 476.2 464.3 4524 436.5 424.6
    630 630 65 600 585 570 550 535
    SJKM8-100 1P,2P Fixed-type Power Distribution and Motor Protection
    SJKM8-4
    • ① Outline Dimensions
    • ② Chassis Installation
    • ③ DIN Rail Installation
    • ④ Front-of-Panel Opening (Small)
    • ⑤ Front-of-Panel Opening (Large)
    SJKM8-100 3P,4P Fixed-type Power Distribution and Motor Protection
    SJKM8-5
    • ① Outline Dimensions
    • ② Chassis Installation
    • ③ DIN Rail Installation
    • ④ Front-of-Panel Opening (Small)
    • ⑤ Front-of-Panel Opening (Large)
    Frequently Asked Questions
    Q What is the rated current range of the SJKM8 Series Moulded Case Circuit Breaker?
    The SJKM8 Series MCCB covers a rated current range from 15A up to 630A at 40℃, with available frame sizes including SJKM8-100, SJKM8E-160/250, SJKM8-160/250, SJKM8-400, and SJKM8-630 to suit various power distribution and motor protection applications.
    Q What international standards does the SJKM8 MCCB comply with?
    The SJKM8 Series circuit breaker's electrical performance complies with IEC 60947-2 and EN 60947-2 standards, ensuring reliable and internationally recognized safety performance for industrial and commercial installations.
    Q What is the maximum ultimate breaking capacity (Icu) of the SJKM8 MCCB?
    The SJKM8 Series achieves a maximum ultimate breaking capacity (Icu) of up to 100kA rms at 220/240V AC for the H-type in the 400A and 630A frame sizes. At 380/400V, the maximum Icu reaches 50kA rms for H-type units in the 400A and 630A frames.
    Q What installation types and connection methods are available for the SJKM8?
    The SJKM8 supports both Fixed and Plug-in installation types, each with Front connection and Rear connection options. Control can be performed via a toggle handle or a direct/extended rotary handle, providing flexible installation solutions for different panel configurations.
    Q Does the SJKM8 support Modbus communication and remote monitoring?
    Yes. The SJKM8 Series supports Modbus communication through the Pm200 Meter for electrical measurements including current, voltage, power, and energy, as well as the Mc Multi-Circuit Monitoring Unit for status monitoring and current/voltage measurement across all frame sizes.
    Q How does ambient temperature affect the rated current of the SJKM8 circuit breaker?
    The rated current of the SJKM8 decreases as ambient temperature rises above the standard 40℃ reference. For example, a 630A breaker rated at 630A at 40℃ will derate to approximately 535A at 70℃. It is important to consult the ambient temperature derating table to ensure correct breaker selection for high-temperature environments.