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Home > Circuit Breaker > China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
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China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories
China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories

China SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Factories

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 Description

Type Designation
Type Designation Diagram
1Manufacturer Identification Code
2Molded Case Circuit Breaker Code
3Design Serial Number
4Frame Rating Current
5Breaking Capacity Characteristic Code
6Operation Mode Code: Manual (No code), Power ("P"), Rotary Handle ("Z")
7Number of Poles
8Trip Unit Type & Accessory Code
9Application Code: Distribution (No code), Motor Protection ("2")
10Neutral Pole Type for 4-Pole Breakers
Product Display
Product View 1
Product View 2
Technical Parameters
Frame Rated Current Inm (A) 63 100 250 400 630 800
Model (L/M Type) 63L63M 100L100M 250L250M 400L400M 630L630M 800L800M
Number of Poles 3 / 4
Rated Insulation Voltage Ui (V) AC800
Rated Impulse Voltage Uimp (V) 8000
Icu (kA) AC400V 355050705070507050706575
AC690V ---20-20-20-20-30
Utilization Category A
Note:
1. Endurance represents operation cycles before repair/replacement per GB14048.1.
2. Zero-arc performance is achieved by selecting specific zero-arc chutes (4mm to 9.5mm depending on model).
Overall and Installation Dimensions
Dimension Technical Drawing
Model Poles A (W) B (L) C (H) Installation (a) Installation (b)
SJKM3-63L/M3/475/1001306025/50111
SJKM3-100L/M3/492/1221507230/60129
SJKM3-250L/M3/4107/1421659035/70126
SJKM3-400L/M3/4149/19825711244/94194
SJKM3-630L/M3/4182/24027011758/116200
SJKM3-800L/M3/4210/28028011370/140243
Frequently Asked Questions
What applications is the SJKM3 series MCCB suitable for?
The SJKM3 series is designed for both power distribution and motor protection applications. For motor protection, a specific "2" application code is used.
What are the available pole configurations?
This molded case circuit breaker is available in both 3-pole and 4-pole configurations to suit different electrical system requirements.
What is the maximum rated insulation voltage (Ui)?
The SJKM3 series features a high rated insulation voltage of AC 800V, ensuring safety and reliability in industrial environments.
Can these breakers be operated remotely?
Yes, by choosing the "P" operation mode code, the device can be configured for power (electric) operation, in addition to manual and rotary handle options.
How is zero-arc performance achieved?
Zero-arc (arc-free) performance can be achieved by selecting and installing specific zero-arc chutes with heights ranging from 4mm to 9.5mm, depending on the frame size.
What is the mechanical endurance of these units?
The units are built for durability, with maintenance-free mechanical endurance reaching up to 20,000 operations for smaller frames and 10,000 for larger frames.

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