China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
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China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory
China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory

China SJKM1E Molded Case Circuit Breaker ECB: Reliable 400V Circuit Protection from China Suppliers and Factory Manufacturer, Factory

The SJKM1E Molded Case Circuit Breaker ECB is an essential solution for comprehensive circuit protection in 400V AC systems (50/60Hz, up to 800A). Manufactured in China, this breakout product features adjustable overcurrent, short-circuit (both instantaneous and delayed), and optional undervoltage/phase-failure protection, ensuring reliable power distribution with reduced downtime for various applications. Available from our reputable suppliers, the SJKM1E ECB comes in both M-type and H-type (high-breaking capacity) versions, providing 800V insulation and exceptional arc resistance. It supports vertical and horizontal installation options, along with a unique isolation capability, all while conforming to IEC60947 standards. This circuit breaker is ideal for industrial automation applications, featuring Z/B type units equipped with communication interfaces for seamless remote monitoring. Trust our factory to deliver top-quality circuit protection solutions tailored to your needs
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Product Description

Type Designation
SJKM1E
①Business Code
②Molded Case Circuit Breaker (MCCB) Designation
③Design Code
④Electronic Release
⑤Frame Current Rating (A)
⑥Rated Ultimate Three-Phase Breaking Capacity Class (Note 1)
⑦Operation Mode (Note 2)
⑧Number of Poles
⑨Release Mechanism Type and Accessory Code
⑩Product Type (Note 3)
Usage Environment Conditions
  • Altitude: ≤ 2000 m; Ambient temperature: -5°C ~ +40°C
  • Resistant to the effects of humid air
  • Resistant to the effects of salt mist and oil mist
  • The installation category of the main circuit of the circuit-breaker is III, and the installation categories of the remaining auxiliary circuits and control circuits are II
  • When the maximum temperature is +40°C, the relative air humidity shall not exceed 50%. A higher relative humidity is allowed at lower temperatures. Special measures should be taken for the occasional occurrence of condensation due to temperature changes
  • Maximum inclination: 22.5°
  • In a non-explosive medium, and the medium does not contain gases and conductive dusts that can corrode metals and damage insulation
  • In a place without rain and snow attacks
Product Display
SJKM1E Molded Case Circuit Breaker ECB (3)
SJKM1E Molded Case Circuit Breaker ECB (2)
SJKM1E Molded Case Circuit Breaker ECB (1)
Product Structure and Marking Instructions
Circuit Breaker Front Indicator (or Circuit Breaker Faceplate Indications)
SJKM1E img
SJKM1E img2
  • Overload long-time delay trip current I1 adjustment: According to the different rated currents of the circuit breaker, adjustment can be made from 4th to 10th gear
  • Long-time delay action time t1 adjustment: 4 gears can be adjusted
  • Short-time delay trip current I2 adjustment: 10 gears can be adjusted
  • Short-time delay action time t2 adjustment: 4 gears can be adjusted
  • Instantaneous trip current I3 adjustment: 8th, 9th, or 10th gear can be adjusted
  • Pre-alarm trip current Ir0 adjustment: 7 gears can be adjusted
  • Test terminal, used for undervoltage release testing (or trip unit testing)
Technical Parameters
Model SJKM1E-125 SJKM1E-250
Shell-frame Rated Current Inm (A) 125 250
Rated Current (Adjustable) In (A) 16-32A adjustable | 32-63A adjustable | 63-125A adjustable 100-250A adjustable
Rated Operating Voltage Ue (V) AC400V
Rated Insulation Voltage Ui (V) AC800V
Rated Impulse Withstand Voltage Uimp (V) AC800V
Number of Poles 3 4 3 4
Rated Ultimate Short-circuit Breaking Capacity Level M H M H M H M H
Rated Ultimate Short-circuit Breaking Capacity Icu (kA) 50 85 50 85 50 85 50 85
Rated Service Short-circuit Breaking Capacity Ics (kA) 35 50 35 50 35 50 35 50
Rated Short-time Withstand Current Icw (kA)/1s
Utilization Category A A
Operating Performance (times) Energized 3000 3000
De-energized 7000 7000
Overall Dimensions L 150 165
W 92 122 107 142
H 92 90
Arcing Distance (mm) ≤50 ≤50
SJKM1E-400 SJKM1E-630 SJKM1E-800
400 630 800
200~400A adjustable 400~630A adjustable 630~800A adjustable
AC400V
AC800V
AC800V
3 4 3 4 3 4
MH MH MH MH MH MH
7585 7585 80100 80100 80100 80100
5565 5565 6070 6070 6070 6070
5 8 10
B B B
2000 1500 1500
4000 3000 3000
257 280 280
150 210 280 210 280
16.5 115.5 115.5
≤100 ≤100 ≤100
Overall Dimensions and Installation Dimensions
Overall Dimensions and Installation Dimensions
Frequently Asked Questions (FAQ)
Q1: What is the SJKM1E Molded Case Circuit Breaker (MCCB) used for?
The SJKM1E MCCB is designed to provide overload protection, short-circuit protection, and switching control for electrical distribution systems operating at AC400V. It is suitable for industrial and commercial power distribution panels requiring reliable circuit protection with electronic release functionality.
Q2: What frame current ratings are available for the SJKM1E series?
The SJKM1E series is available in five frame current ratings: 125A, 250A, 400A, 630A, and 800A. Each model supports adjustable rated currents within its respective range to suit various application requirements.
Q3: What is the maximum breaking capacity of the SJKM1E circuit breaker?
The rated ultimate short-circuit breaking capacity (Icu) varies by model and capacity class. For the H-class models, the breaking capacity reaches up to 85 kA for the 125A and 250A frames, and up to 100 kA for the 630A and 800A frames, making it suitable for high-fault-current environments.
Q4: What installation environment conditions are required for the SJKM1E?
The SJKM1E should be installed at altitudes not exceeding 2000 m, with ambient temperatures between -5°C and +40°C. It must be installed in non-explosive, non-corrosive environments, free from rain and snow, and with a maximum installation inclination of 22.5°.
Q5: How many poles are available for the SJKM1E MCCB?
The SJKM1E is available in both 3-pole and 4-pole configurations across all frame sizes (125A, 250A, 400A, 630A, and 800A), providing flexibility for three-phase and three-phase plus neutral distribution systems.
Q6: What protection functions can be adjusted on the SJKM1E electronic release?
The SJKM1E electronic release supports multi-gear adjustment for overload long-time delay trip current (I1), long-time delay action time (t1), short-time delay trip current (I2), short-time delay action time (t2), instantaneous trip current (I3), and pre-alarm trip current (Ir0). It also includes a test terminal for undervoltage release testing.

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