High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company
High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company
High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company
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High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company
High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company
High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company

High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company

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
SJKM3 MCCB Type Designation Overview
1Manufacturer Identification Code
2Molded Case Circuit Breaker Code
3Design Serial Number
4Frame Rating Current
5Breaking Capacity Characteristic Code
6Operation Mode Code:
No code for manual operation, "P" for power operation, "Z" for rotary handle operation
7Number of Poles
8Trip Unit Type & Accessory Code
9Application Code:
No code for distribution application, "2" for motor protection application
10Neutral Pole Type for 4-Pole Breakers
Product Display
SJKM3 Molded Case Circuit Breaker View 1
SJKM3 Molded Case Circuit Breaker View 2
Technical Parameters
Frame Rated Current Inm (A) 63 100 250 400 630 800
Model SJKM3-63LSJKM3-63M SJKM3-100LSJKM3-100M SJKM3-250LSJKM3-250M SJKM3-400LSJKM3-400M SJKM3-630LSJKM3-630M SJKM3-800LSJKM3-800M
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 AC400AC400 AC690 AC400AC400 AC690 AC400AC400 AC690 AC400AC400 AC690 AC400AC400 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 3550 5070 5070 5070 5070 6575
AC690V -- -20 -20 -20 -20 -30
Rated Service Short-circuit Breaking Capacity Ics (kA) AC400V 2235 3550 3550 5050 5050 6565
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 92/122 107/142 149/198 182/240 210/280
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 Dimensions Diagram
Model Number of Poles Overall Dimensions (mm) Installation Dimensions (mm)
A B C D a b Ad
LM LM LM LM
SJKM3-63L/M 3 75 130 8190 6070 25 111 3.5
4 100 50
SJKM3-100L/M 3 92 150 90110 7292 30 129 4.5
4 122 60
SJKM3-250L/M 3 107 165 110127 90107 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
Frequently Asked Questions
What pole configurations are available for the SJKM3 series?

The SJKM3 molded case circuit breaker series supports both 3-pole and 4-pole configurations across all frame sizes (63A up to 800A).

Can the SJKM3 MCCB be used for motor protection?

Yes. Standard models with no code are designed for distribution applications, while units with application code "2" are engineered specifically for motor protection applications.

What operation modes are available for this series?

The SJKM3 provides direct manual operation (standard, no code), power operation indicated by "P", and rotary handle operation indicated by "Z".

What are the differences between "L" and "M" breaking capacity models?

"L" represents standard breaking capacity, while "M" provides higher short-circuit breaking capability (Icu/Ics), including support for AC690V operating conditions on 100A through 800A frames.

How can zero-arc performance be achieved?

Zero-arc (arc-free) performance is achieved by outfitting the breaker with zero-arc chutes tailored to the specific frame size, varying from 4mm up to 9.5mm height.

What are the electrical and mechanical endurance ratings?

Depending on frame size, the SJKM3 achieves up to 8,000 electrical operations at AC400V, with a mechanical endurance of up to 20,000 operations maintenance-free and up to 40,000 operations with maintenance.

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