SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection - Reliable China Suppliers & Factory Solutions

The SJKM3 MCCB Molded Case Circuit Breaker is a top choice among China suppliers for advanced circuit protection in 50/60Hz systems up to 690V and 1250A. This high-performance MCCB offers comprehensive overload, short-circuit, and undervoltage protection, featuring 800V insulation and a compact design that maximizes space efficiency. With its high-breaking capacity and reduced arc flash risk, the SJKM3 is perfect for both power distribution and motor protection, particularly in applications that involve infrequent starts. This versatile circuit breaker supports both vertical and horizontal installation, aligning with IEC60947-2 and GB14048.2 standards. Manufactured in our factory with an innovative trip unit, the SJKM3 MCCB ensures precise fault detection and stable operation under varying load conditions, making it a reliable solution for industrial and commercial environments. Choose the SJKM3 MCCB for superior fault protection and efficiency in your electrical systems

Product Details

Type Designation

SJKM3-MCCB-Moulded-Case-Circuit-Breaker-3

1	Manufacturer Identification Code
2	Molded Case Circuit Breaker Code
3	Design Serial Number
4	Frame Rating Current
5	Breaking Capacity Characteristic Code
6	Operation Mode Code: No code for manual operation, "P" for power operation, "Z" for rotary handle operation
7	Number of Poles
8	Trip Unit Type & Accessory Code
9	Application Code: No code for distribution application, "2" for motor protection application
10	Neutral Pole Type for 4-Pole Breakers

Product Display

SJKM3-MCCB-Moulded-Case-Circuit-Breaker-(1)

SJKM3-MCCB-Moulded-Case-Circuit-Breaker-(2)

Technical Parameters

Frame Rated Current Inm (A)		63		100		250		400		630		800
Model		SJKM3-63L	SJKM3-63M	SJKM3-100L	SJKM3-100M	SJKM3-250L	SJKM3-250M	SJKM3-400L	SJKM3-400M	SJKM3-630L	SJKM3-630M	SJKM3-800L	SJKM3-800M
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		AC400	AC400 AC690	AC400	AC400 AC690	AC400	AC400 AC690	AC400	AC400 AC690	AC400	AC400 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	35	50	50	70	50	70	50	70	50	70	65	75
	AC690V				20		20		20		20		30
Rated Service Short-circuit Breaking Capacity Ics (kA)	AC400V	22	35	35	50	35	50	50	50	50	50	65	65
	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		150/198		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

Model	Number of Poles	Overall Dimensions								Installation Dimensions
		A		B		C		D
		L	M	L	M	L	M	L	M	a	b	Ad
SJKM3-63L/M	3	75		130		81	90	60	70	25	111	3.5
	4	100								50
SJKM3-100L/M	3	92		150		90	110	72	92	30	129	4.5
	4	122								60
SJKM3-250L/M	3	107		165		110	127	90	107	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 (FAQ)

Q: What is the rated insulation voltage (Ui) for the SJKM3 series MCCB?

The rated insulation voltage (Ui) for all models in the SJKM3 Moulded Case Circuit Breaker series is AC800V.

Q: How many poles are available for the SJKM3 Molded Case Circuit Breakers?

The SJKM3 series breakers are available in both 3-pole (3P) and 4-pole (4P) configurations to meet different circuit requirements.

Q: How do I achieve zero-arc (arc-free) performance with the SJKM3 series?

Zero-arc performance is achieved by selecting zero-arc chutes with specific heights corresponding to the model: 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, and 9.5mm for SJKM3-800L/M.

Q: What do the operation mode codes represent in the type designation?

In the type designation code, the operation mode is indicated as follows: no code represents manual operation, "P" stands for power operation, and "Z" stands for rotary handle operation.

Q: What is the mechanical endurance of the SJKM3 MCCB series?

Depending on the model, the maintenance-free mechanical endurance ranges from 10,000 to 20,000 operations, and can reach up to 20,000 to 40,000 operations when proper maintenance is performed.

Q: What is the application difference between code "2" and no code in designation?

Having no application code in the type designation indicates standard power distribution applications, whereas the application code "2" specifies motor protection applications.