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SJKM3E Electronic Circuit Breaker (ECB) with Smart Protection

The SJKM3E Electronic Circuit Breaker (ECB) delivers advanced circuit protection for 16A-800A loads at 400V/800V AC (50/60Hz) in 3P/4P configurations. This industrial-grade ECB meets IEC60947-2/GB14048.2 standards, featuring 8kV impulse withstand and reliable isolation with visible "OFF" position indication. Designed for harsh environments, it operates at 2000m altitude (with derating) and withstands Pollution Degree III conditions with IP20/IP40 protection. The SJKM3E ECB ensures stable performance in +40°C/50% humidity (90% monthly max), making it ideal for power distribution systems requiring precision protection and isolation safety.

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    product details

    Type Designation

    SJKM3E ECB
    ① Product Type
    ② Molded Case Circuit Breaker (MCCB) Designation
    ③ Design Code
    ④ Release Type
    ⑤ Frame Current Rating (A)
    ⑥ Breaking Capacity Class
    ⑦ Operation Mode
    ⑧ Number of Poles
    ⑨ Accessory Code

    Release Mechanism Type and Internal Accessory Code

    ♦ Release Characteristics

    With protection functions including overload long-time inverse time delay, short-circuit time delay inverse limit, short-circuit short-time delay fixed time limit, and short-circuit instantaneous action, users can set the required protection characteristics themselves. The neutral line overcurrent protection current and time parameters automatically track 100% of the phase line setting values. The release characteristics are shown in the following diagram.

    SJKM3E-3SJKM3E-4

    口 Alarm Contact (NC)

    ■ Auxiliary Contact (NO+NC)

    ● Shunt Release

    ○ Undervoltage Release

    → Wiring Direction

    SJKM3E-5

     product Display

    SJKM3E Earth Leakage Circuit Breaker (1)
    SJKM3E Earth Leakage Circuit Breaker (3)
    SJKM3E Earth Leakage Circuit Breaker (2)
    SJKM3E Earth Leakage Circuit Breaker (4)

    SJKM3E Series Front Panel Wiring

    ◆ SJKM3E-125 (L,M,H) Front Panel Wiring (2-pole, 3-pole, 4-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-6
    ◆ SJKM3E-125 (L,M,H) Insert Type Front Panel Wiring (3-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-7
    ◆ SJKM3E-250 (L,M,H) Front Panel Wiring (3-pole, 4-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-8
    ◆ SJKM3E-250 (L,M,H) Insert Type Front Panel Wiring (3-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-9
    ◆ SJKM3E-400 (L,M,H) Front Panel Wiring (3-pole, 4-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-10
    ◆ SJKM3E-400 (L,M,H) Insert Type Front Panel Wiring (3-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-11
    ◆ SJKM3E-630,800 (L,M,H) Front Panel Wiring (3-pole, 4-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-12
    ◆ SJKM3E-630,800 (L,M,H) Insert Type Front Panel Wiring (3-pole) X-X, Y-Y are the centers of 3-pole circuit breaker SJKM3E-13