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SJKM1-Moulded-Case-Circuit-Breaker.jpg
SJKM1 Moulded Case Circuit Breaker (MCCB).jpg
SJKM1-Moulded-Case-Circuit-Breaker.jpg
SJKM1 Moulded Case Circuit Breaker (MCCB).jpg

SJKM1 Moulded Case Circuit Breaker (MCCB) - Reliable Power Protection from China Suppliers and Factory

The SJKM1 Moulded Case Circuit Breaker (MCCB) is expertly engineered for AC power systems operating at 50/60Hz, catering to voltages up to 690V and current ratings of 1250A. As a trusted product among China suppliers, the SJKM1 MCCB delivers exceptional protection against overloads, short circuits, and undervoltage in various distribution networks. With options available for frame sizes up to 400A, it is also capable of protecting motors effectively. This product complies with international standards, including IEC 60947-2 and GB14048.2, ensuring safe power distribution and reliable equipment protection. Built to withstand infrequent switching and to efficiently support motor starting, the SJKM1 Moulded Case Circuit Breaker is an ideal choice for industrial and commercial applications. Choose our factory for high-quality, dependable circuit protection solutions
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    Product Details

    Type Designation
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-5
    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
    ⑨ Function Code 1
    ⑩ Type code (See Table 1 for N-pole of four-pole, no code for three-pole)

    Notes:

    1. There is no code for distribution circuit breakers; for motor-protection circuit breakers, use 2 to represent.

    2. Number of poles: 2 for two-pole; 3 for three-pole; 4 for four-pole.

    3. For handle-direct operation: use D to represent for power-distribution use, and use Z to represent for conversion-locking use.

    4. For economy type: represent with E; for standard type: represent with M; for higher-reliability type: represent with H; for high-breaking type: represent with L.

    Product Display
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(1)
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(2)
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(3)
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(4)
    N-pole Type Code
    Type Code Description
    Type A No over-current release element is installed on the N-pole, and the N-pole is always connected, and does not close and open together with the other three poles.
    Type B No over-current release element is installed on the N-pole, and the N-pole closes and opens together with the other three poles (the N-pole closes first and opens later).
    Type C An over-current release element is installed on the N-pole, and the N-pole closes and opens together with the other three poles (the N-pole closes first and opens later).
    Type D An over-current release element is installed on the N-pole, and the N-pole is always connected, and does not close and open together with the other three poles.
    Release Modes and Accessory Codes
    Accessory Name Without Accessory Alarm Contact Shunt Release Auxiliary Contact Under-voltage Release Shunt Release Auxiliary Contact Two-group Auxiliary Contacts Shunt Release Under-voltage Release Auxiliary Contact Under-voltage Release
    Release Mode Instantaneous Code 200 208 210 220 230 240 250 260 270
    Release Mode Compound Code 300 208 310 320 330 340 350 360 370

    (Continued from the previous table)

    Accessory Name Shunt Release Alarm Contact Auxiliary Contact Alarm Contact Under-voltage Release Alarm Contact Shunt Release Auxiliary Contact Alarm Contact Two-group Auxiliary Contact Alarm Contact Auxiliary Contact Under-voltage Release Alarm Contact
    Release Mode Instantaneous Code 218 228 238 248 268 278
    Release Mode Compound Code 318 328 338 348 268 378

    Notes:

    1) 200 indicates the circuit breaker body with only an electromagnetic release; 300 indicates the circuit breaker body with thermal and electromagnetic releases.

    2) For the two-level products SJKM1-125 and SJKM1-250, only 210, 310, 220, 320, 230, and 330 are available.

    Normal Operating Conditions and Installation Conditions

    Ambient temperature: The circuit breaker can operate normally at an ambient temperature range of -5°C to +40°C (except for special orders).

    Altitude: The altitude of the installation site of the circuit breaker shall not exceed 2000m.

    Pollution degree: The pollution degree of the circuit breaker is Grade 3.

    Installation category: The installation category of the circuit breaker is Category III.

    Installation position: The circuit breaker can be installed horizontally, vertically, or flat, without reducing its electrical performance.

    Main Parameters and Technical Performances
    Circuit Breaker Model SJKM1-63 SJKM1-125 SJKM1-250 SJKM1-400 SJKM1-630 SJKM1-800 SJKM1-1250
    Pole Number 3 4 3 2 4 3 2 4 3 4 3 4 3 4 3 4
    Rated Current In A 10 16 20 25 32 40 50 63 16 20 25 32 40 50 63 80 100 125 100 125 140 160 180 200 225 250 225 250 315 350 400 400 500 630 630 700 800 800 1000 1250
    Rated Insulation Voltage Ui (V) 690 1000 1000 1000 1000 1000 1000
    Rated Impulse Withstand Voltage Uimp V 6000 8000
    Rated Working Voltage Ue V 400 AC400/690 AC400/690 AC400/690 AC400/690 AC400/690 AC400/690
    Breaking Capacity Level L M L M H L M H L M H L M H H H
    Ultimate Short-Circuit Breaking Capacity Icu (kA) (0-tCO) 400V 25 50 35 50 85 35 50 85 50 65 100 50 65 100 100 100
    690V 25 25 30 30 25
    Service Short-Circuit Breaking Capacity Ics (kA) (0-tCOtCO) 400V 18 30 25 35 50 25 35 65 35 50 65 35 50 65 65 50
    690V 15 15 20 20 20
    Appearance and Installation Dimensions

    Appearance and installation dimensions of the fixed-type front-connected and rear-connected wiring

    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB) (1)
    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB) (2)

    Appearance and installation dimensions of fixed-type front and rear wiring

    Model Number Overall Dimensions (mm) Mounting Dimensions (mm) Dimensions for Rear Terminal Wiring (mm)
    L L1 W H H1 H2 a b φd a1 b1 d1 H3 H4
    SJKM1-63L 3 135 21 76 88 72 19 25 117 4 25 117 18 52 75
    SJKM1-63M 97 82 28
    SJKM1-63 4 103
    SJKM1-125L 150 51 92 86 68 24 30 129 4.5 30 132 22 65 100
    SJKM1-125M 3 104 86 23
    SJKM1-125H
    SJKM1-125 2 65 ---
    4 122 30
    SJKM1-250L 165 64 107 108 87 25 35 126 5.5 35 144 24 70 110
    SJKM1-250M 3 165 107 124.5 104 24.5
    SJKM1-250H
    SJKM1-250 2 75 --
    4 142
    SJKM1-400 3 257 105 149 150 100 36.5 44 195 6.5 44 225 32 70 120
    4 198
    SJKM1-630 3 270 118 182 155 108 41 58 200 7 58 234 40 70 120
    4 240
    SJKM1-800 3 282 102 210 158 103 34.5 70 243 7 70 243 48 70 125
    4 280
    SJKM1-1250 3 406 104 210 190 140.5 58.5 70 375 10 - - -
    手柄 H W Protrusion in the middle L W H
    63 17 13.5 63 44 22 5.5
    125 19 13 125 51 23 5.5
    250 22 12.5 250 52 23 4
    400 43.5 33.5 400 89.5 65 7
    630 44 33.5 630 90 65.5 7
    800 40 33.5 800 105 61 5
    1250 51 41 1250 100 78 16

    Appearance and installation dimensions of the plug-in type front-connected wiring

    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB) (3)

    Appearance and installation dimensions of plug-in type rear-panel wiring

    Model W L A H1 G G1 a b d
    SJKM1-63 75 135 18 28 17 15 50 60 6
    SJKM1-125 92 170 38 50 33 28 60 56 6.5
    SJKM1-250 107 186 46 50 33 40 70 54 7
    SJKM1-400 144 280 50 60 40 48 88 143 9
    SJKM1-630 182 300 65 60 40 53 100 123 9
    SJKM1-800 212 298 57 100 43 129 140 143 9

    Outline and Installation Schematic Diagram of Withdrawable Device

    SJKM1-Moulded-Case-Circuit-Breaker-(MCCB) (4)

    Outline and Installation Dimensions of Withdrawable Device

    Model Pole Overall Dimensions Installation Dimensions
    L1 L2 L3 H1 H2 H3 W1 W2 φd1 A B φd2
    SJKM1-400/M 3P 310 339 203 253 17.5 77 48 223 φ11 96 134 φ6.5
    4P 310 339 203 253 17.5 77 48 271 φ11 144 134 φ6.5
    SJKM1-630/M 3P 341 381 211 282 17.5 92 58 253 φ13 116 140 φ6.5
    4P 341 381 211 282 17.5 92 58 311 φ13 174 140 φ6.5
    SJKM1-800/M 3P 367 410 241 238 26 73 70 289 φ13 140 131 φ6.5
    4P 367 410 241 238 26 73 70 359 φ13 210 131 φ6.5
    Frequently Asked Questions (FAQ)
    QWhat are the available frame sizes for the SJKM1 Moulded Case Circuit Breaker (MCCB)?
    The SJKM1 MCCB is available in seven frame sizes: SJKM1-63, SJKM1-125, SJKM1-250, SJKM1-400, SJKM1-630, SJKM1-800, and SJKM1-1250, covering a rated current range from 10A up to 1250A to suit various application requirements.
    QWhat breaking capacity levels are available for SJKM1 circuit breakers?
    The SJKM1 series offers multiple breaking capacity levels: Economy type (E), Standard type (M), Higher-reliability type (H), and High-breaking type (L). For example, the SJKM1-400 is available in L, M, and H levels with ultimate short-circuit breaking capacities (Icu) at 400V of 50kA, 65kA, and 100kA respectively.
    QWhat is the operating temperature range and installation altitude limit for SJKM1 MCCBs?
    The SJKM1 circuit breaker is designed to operate normally within an ambient temperature range of -5°C to +40°C (standard conditions). The installation site altitude must not exceed 2000m. Special orders may be available for operation outside these standard conditions.
    QWhat types of N-pole configurations are available for four-pole SJKM1 breakers?
    Four-pole SJKM1 breakers support four N-pole configurations: Type A (always connected, no over-current release), Type B (closes/opens with other poles, no over-current release), Type C (closes/opens with other poles, with over-current release), and Type D (always connected, with over-current release). For three-pole versions, no N-pole type code is required.
    QWhat accessories and release modes can be combined with the SJKM1 MCCB?
    The SJKM1 supports a wide range of accessory combinations including Alarm Contact, Shunt Release, Auxiliary Contact, Under-voltage Release, and various combinations thereof. Both Instantaneous (200-series) and Compound/Thermal-Electromagnetic (300-series) release modes are available. Note that for SJKM1-125 and SJKM1-250, only codes 210, 310, 220, 320, 230, and 330 are available.
    QIn what mounting orientations can the SJKM1 MCCB be installed, and what wiring methods are supported?
    The SJKM1 circuit breaker can be installed horizontally, vertically, or flat without any reduction in electrical performance. It supports fixed-type front-connected wiring, fixed-type rear-connected wiring, plug-in type front wiring, plug-in type rear-panel wiring, and withdrawable device installation, providing flexible solutions for various panel and switchboard configurations.