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SJKM3 MCCB Moulded Case Circuit Breaker.jpg
SJKM3 MCCB.jpg
SJKM3 MCCB Circuit Breaker.jpg

SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection

The SJKM3 MCCB Moulded Case Circuit Breaker delivers advanced circuit protection for 50/60Hz systems up to 690V and 1250A. Combining overload, short-circuit, and undervoltage protection, this MCCB features 800V insulation, compact size, and high-breaking capacity with minimal arc flash. Ideal for power distribution and motor protection (infrequent starts), the SJKM3 MCCB supports both vertical/horizontal installation while complying with IEC60947-2 & GB14048.2. Its innovative design ensures reliable performance in industrial/commercial applications, offering superior fault protection with space-saving advantages. Its innovative trip unit ensures precise fault detection while maintaining stable operation under variable load conditions.

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    product details

    Type Designation

    SJKM3-MCCB-Moulded-Case-Circuit-Breaker-3
    1 Manufacturer Identification Code
    2 Molded Case Circuit Breaker Code
    3 Design Serial Number
    4 Frame Rating Current
    5 Breaking Capacity Characteristic Code
    6 Operation Mode Code:
    No code for manual operation, "P" for power operation, "Z" for rotary handle operation
    7 Number of Poles
    8 Trip Unit Type & Accessory Code
    9 Application Code:
    No code for distribution application, "2" for motor protection application
    10 Neutral Pole Type for 4-Pole Breakers

     product Display

    SJKM3-MCCB-Moulded-Case-Circuit-Breaker-(1)
    SJKM3-MCCB-Moulded-Case-Circuit-Breaker-(2)

    Technical Parameters

    Frame Rated Current Inm (A) 63 100 250 400 630 800
    Model SJKM3-63L SJKM3-63M SJKM3-100L SJKM3-100M SJKM3-250L SJKM3-250M SJKM3-400L SJKM3-400M SJKM3-630L SJKM3-630M SJKM3-800L SJKM3-800M
    Number of Poles 3/4 3/4 3/4 3/4 3/4 3/4
    Rated Current In (A) 10/16/20/25/ 32/40/50/63 10/16/20/25/32/40/ 50/63/80/100 100/125/140/160/ 180/200/225/250 225/250/315/350/400 400/500/630 400/500/630/ 700/800
    Rated Insulation Voltage Ui (V) AC800 AC800 AC800 AC800 AC800 AC800
    Rated Impulse Withstand Voltage Uimp (V) 8000 8000 8000 8000 8000 8000
    Rated Operational Voltage Ue(V) 50Hz/60Hz AC400 AC400 AC400 AC690 AC400 AC400 AC690 AC400 AC400 AC690 AC400 AC400 AC690 AC400 AC400 AC690
    Arc Distance (mm) ≯50(0) ≯50(0) ≯50(0) ≯100(0) ≯100(0) ≯100(0)
    Rated Ultimate Short-circuit Breaking Capacity Icu (kA) AC400V 35 50 50 70 50 70 50 70 50 70 65 75
    AC690V 20 20 20 20 30
    Rated Service Short-circuit Breaking Capacity Ics (kA) AC400V 22 35 35 50 35 50 50 50 50 50 65 65
    AC690V 10 10 15 15 20
    Utilization Category A A A A A A
    Electrical Endurance (operations) AC400V 8000 8000 8000 7500 7500 7500
    AC690V 1500 1000 1000 1000 500
    Mechanical Endurance (operations) Maintenance-free 20000 20000 20000 10000 10000 10000
    With maintenance 40000 40000 40000 20000 20000 20000
    Overall Dimensions (mm) W (3P/4P) 75/100 92/122 107/142 150/198 182/240 210/280
    L 130 150 165 257 270 280
    H 60 92 90 106.5 110 115.5

    Note：

    1. According to GB14048.1, the term "Endurance" represents the probability of operation cycles completed by the electrical device before repair or replacement of components.

    2. Select zero-arc chutes with heights of: 4mm (for SJKM3-63L/M), 6.2mm (for SJKM3-100L/M), 7.5mm (for SJKM3-250L/M), 9.3mm (for SJKM3-400L/M and SJKM3-630L/M)，9.5mm (for SJKM3-800L/M) to achieve zero-arc (arc-free) performance.

    Overall Dimensions and Installation Dimensions

    SJKM3-3
    Model Number of Poles Overall Dimensions Installation Dimensions
    A B C D
    L M L M L M L M a b Ad
    SJKM3-63L/M 3 75 130 81 90 60 70 25 111 3.5
    4 100 50
    SJKM3-100L/M 3 92 150 90 110 72 92 30 129 4.5
    4 122 60
    SJKM3-250L/M 3 107 165 110 127 90 107 35 126 4.5
    4 142 70
    SJKM3-400L/M 3 149 257 155 112 44 194 7
    4 198 94
    SJKM3-630L/M 3 182 270 160 117 58 200 7
    4 240 116
    SJKM3-800L/M 3 210 280 155 113 70 243 7
    4 280 140