Wholesale SJKM1 Moulded Case Circuit Breaker (MCCB) from China Suppliers for Reliable Power Protection in Factories Manufacturers, Manufacturer

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Wholesale SJKM1 Moulded Case Circuit Breaker (MCCB) from China Suppliers for Reliable Power Protection in Factories Manufacturers, Manufacturer

Introducing the SJKM1 Moulded Case Circuit Breaker (MCCB), a top-tier solution for AC 50/60Hz power systems operating up to 690V and 1250A. As a reliable choice among China suppliers, this MCCB offers exceptional protection against overloads, short circuits, and undervoltage, making it perfect for distribution networks. With configurations available for frame sizes up to 400A, it is also capable of safeguarding motors effectively. Crafted in compliance with IEC 60947-2 and GB14048.2 standards, the SJKM1 MCCB ensures safe and efficient power distribution alongside optimal equipment protection. Designed for durability, it supports infrequent switching and motor starts, making it an ideal fit for industrial and commercial applications sourced from trusted factories in China.

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Product Description

Type Designation

SJKM1 Moulded Case Circuit Breaker Designation

No.	Designation Details
①	Manufacturer Code
②	Molded Case Circuit Breaker Code
③	Design Code
④	Frame Size
⑤	Short-Circuit Breaking Capacity Level 4
⑥	Operation method 3
⑦	Number of Poles 2
⑧	Trip Unit Method & File Code
⑨	Function Code 1
⑩	Type code(See Table 1 for N-pole of four-pole,no code for three-pole)

Notes:

1. There is no code for distribution circuit breakers; for motor-protection circuit breakers, use 2 to represent.

2. Number of poles: 2 for two-pole; 3 for three-pole; 4 for four-pole.

3. For handle-direct operation: use D to represent for power-distribution use, and use Z to represent for conversion-locking use.

4. For economy type: represent with E; for standard type: represent with M; for higher-reliability type: represent with H; for high-breaking type: represent with L.

Product Display

SJKM1 Moulded Case Circuit Breaker View 1

SJKM1 Moulded Case Circuit Breaker View 2

SJKM1 Moulded Case Circuit Breaker View 3

SJKM1 Moulded Case Circuit Breaker View 4

N - Pole Type Code

Type Code	Description
Type A	No over-current release element is installed on the N-pole, and the N-pole is always connected, and does not close and open together with the other three poles.
Type B	No over-current release element is installed on the N-pole, and the N-pole closes and opens together with the other three poles (the N-pole closes first and opens later).
Type C	An over-current release element is installed on the N-pole, and the N-pole closes and opens together with the other three poles (the N-pole closes first and opens later).
Type D	An over-current release element is installed on the N-pole, and the N-pole is always connected, and does not close and open together with the other three poles.

Release Modes and Accessory Codes

Accessory Name		Without Accessory	Alarm Contact	Shunt Release	Auxiliary Contact	Under-voltage Release	Shunt Release Auxiliary Contact	Two-group Auxiliary Contacts	Shunt Release Under-voltage Release	Auxiliary Contact Under-voltage Release
Release Mode	Instantaneous Code	200	208	210	220	230	240	250	260	270
Release Mode	Compound Code	300	208	310	320	330	340	350	360	370

(Continued from the previous table)

Accessory Name		Shunt Release Alarm Contact	Auxiliary Contact Alarm Contact	Under-voltage Release Alarm Contact	Shunt Release Auxiliary Contact Alarm Contact	Two-group Auxiliary Contact Alarm Contact	Auxiliary Contact Under-voltage Release Alarm Contact
Release Mode	Instantaneous Code	218	228	238	248	268	278
Release Mode	Compound Code	318	328	338	348	268	378

Notes:

1) 200 indicates the circuit breaker body with only an electromagnetic release; 300 indicates the circuit breaker body with thermal and electromagnetic releases.

2) For the two-level products SJKM1-125 and SJKM1-250, only 210, 310, 220, 320, 230, and 330 are available.

Normal Operating Conditions and Installation Conditions

◆

Ambient temperature: The circuit breaker can operate normally at an ambient temperature range of -5°C to +40°C (except for special orders).

◆

Altitude: The altitude of the installation site of the circuit breaker shall not exceed 2000m.

◆

Pollution degree: The pollution degree of the circuit breaker is Grade 3.

◆

Installation category: The installation category of the circuit breaker is Category III.

◆

Installation position: The circuit breaker can be installed horizontally, vertically, or flat, without reducing its electrical performance.

Main Parameters and Technical Performances

Circuit Breaker Model		SJKM1-63		SJKM1-125			SJKM1-250			SJKM1-400			SJKM1-630			SJKM1-800		SJKM1-1250
Pole Number		3	4	3	2	4	3	2	4	3	4		3		4	3	4	3	4
Rated Current In (A)		10 16 20 25 32 40 50 63		16 20 25 32 40 50 63 80 100 125			100 125 140 160 180 200 225 250			225 250 315 350 400			400 500 630			630 700 800		800 1000 1250
Rated Insulation Voltage Ui (V)		690		1000			1000			1000			1000			1000		1000
Rated Impulse Withstand Voltage Uimp (V)		6000		-			-			-			-			8000		-
Rated Working Voltage Ue (V)		400		AC400/690			AC400/690			AC400/690			AC400/690			AC400/690		AC400/690
Breaking Capacity Level		L	M	L	M	H	L	M	H	L	M	H	L	M	H	H		H
Ultimate Short-Circuit Breaking Capacity Icu (kA)	400V	25	50	35	50	85	35	50	85	50	65	100	50	65	100	100		100
Ultimate Short-Circuit Breaking Capacity Icu (kA)	690V	-	-	-	-	25	-	-	25	-	-	30	-	-	30	-		25
Service Short-Circuit Breaking Capacity Ics (kA)	400V	18	30	25	35	50	25	35	65	35	50	65	35	50	65	65		50
Service Short-Circuit Breaking Capacity Ics (kA)	690V	-	-	-	-	15	-	-	15	-	-	20	-	-	20	-		20

Appearance and Installation Dimensions

◆ Appearance and installation dimensions of the fixed-type front-connected and rear-connected wiring

SJKM1 MCCB Fixed Type Front and Rear Wiring Dimensions Diagram 1

SJKM1 MCCB Fixed Type Front and Rear Wiring Dimensions Diagram 2

◆ Appearance and installation dimensions of fixed-type front and rear wiring

Model	Number	Overall dimensions (mm)								Mounting Dimensions (mm)			Dimensions for Rear Terminal Wiring (mm)
Model	Number	L	L1	W	H	H1	H2	a	b	φd	al	b1	d1	H3	H4
SJKM1-63L	3	135	21	76	88	72	19	25	117	4	25	117	18	52	75
SJKM1-63M	-	-	-	-	97	82	28	-	-	-	-	-	-	-	-
SJKM1-63	4	-	-	103	-	-	-	-	-	-	-	-	-	-	-
SJKM1-125L	-	150	51	92	86	68	24	30	129	4.5	30	132	22	65	100
SJKM1-125M	3	-	-	-	104	86	23	-	-	-	-	-	-	-	-
SJKM1-125H	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
SJKM1-125	2	-	-	65	-	-	-	---	-	-	-	-	-	-	-
SJKM1-125	4	-	-	122	-	-	-	30	-	-	-	-	-	-	-
SJKM1-250L	-	165	64	107	108	87	25	35	126	5.5	35	144	24	70	110
SJKM1-250M	3	165	-	107	124.5	104	24.5	-	-	-	-	-	-	-	-
SJKM1-250H	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
SJKM1-250	2	-	-	75	-	-	-	--	-	-	-	-	-	-	-
SJKM1-250	4	-	-	142	-	-	-	-	-	-	-	-	-	-	-
SJKM1-400	3	257	105	149	150	100	36.5	44	195	6.5	44	225	32	70	120
SJKM1-400	4	257	105	198	150	100	36.5	44	195	6.5	44	225	32	70	120
SJKM1-630	3	270	118	182	155	108	41	58	200	7	58	234	40	70	120
SJKM1-630	4	270	118	240	155	108	41	58	200	7	58	234	40	70	120
SJKM1-800	3	282	102	210	158	103	34.5	70	243	7	70	243	48	70	125
SJKM1-800	4	282	102	280	158	103	34.5	70	243	7	70	243	48	70	125
SJKM1-1250	3	406	104	210	190	140.5	58.5	70	375	10	-	-	-	-	-
Handle	H			W				Protrusion in the middle			L			W		H
63	17			13.5				63			44			22		5.5
125	19			13				125			51			23		5.5
250	22			12.5				250			52			23		4
400	43.5			33.5				400			89.5			65		7
630	44			33.5				630			90			65.5		7
800	40			33.5				800			105			61		5
1250	51			41				1250			100			78		16

◆ Appearance and installation dimensions of the plug-in type front-connected wiring

SJKM1 Plug-in Type Front Wiring Dimensions

◆ Appearance and installation dimensions of plug-in type rear-panel wiring

Model	W	L	A	H1	G	G1	a	b	d
SJKM1-63	75	135	18	28	17	15	50	60	6
SJKM1-125	92	170	38	50	33	28	60	56	6.5
SJKM1-250	107	186	46	50	33	40	70	54	7
SJKM1-400	144	280	50	60	40	48	88	143	9
SJKM1-630	182	300	65	60	40	53	100	123	9
SJKM1-800	212	298	57	100	43	129	140	143	9

◆ Outline and Installation Schematic Diagram of Withdrawable Device

SJKM1 Withdrawable Device Installation Diagram

◆ Outline and Installation Dimensions of Withdrawable Device

Model	pole	overall dimensions									installation dimensions
Model	pole	L1	L2	L3	H1	H2	H3	W1	W2	φd1	A	B	φd2
SJKM1-400/M	3P	310	339	203	253	17.5	77	48	223	φ11	96	134	φ6.5
SJKM1-400/M	4P	310	339	203	253	17.5	77	48	271	φ11	144	134	φ6.5
SJKM1-630/M	3P	341	381	211	282	17.5	92	58	253	φ13	116	140	φ6.5
SJKM1-630/M	4P	341	381	211	282	17.5	92	58	311	φ13	174	140	φ6.5
SJKM1-800/M	3P	367	410	241	238	26	73	70	289	φ13	140	131	φ6.5
SJKM1-800/M	4P	367	410	241	238	26	73	70	359	φ13	210	131	φ6.5

Frequently Asked Questions (FAQ)

What are the standard ambient operating temperatures for SJKM1 MCCBs?

The SJKM1 moulded case circuit breaker is engineered to operate reliably in ambient temperature conditions ranging from -5°C to +40°C. Custom builds are available for requirements outside this temperature threshold.

What is the altitude limitation for installing the SJKM1 circuit breaker?

The maximum recommended installation altitude is 2000 meters above sea level to maintain full technical ratings and electrical performance specifications.

Can the SJKM1 series be installed in orientations other than vertical?

Yes, the SJKM1 series features multi-directional mounting versatility. It can be mounted horizontally, vertically, or flat without derating its rated electrical performance.

What defines the differences between N-Pole Type A and Type B units?

Type A features an always-connected neutral pole without an over-current release element that does not open/close synchronously with the phase poles. Type B also lacks an over-current release element but opens and closes synchronously with phase poles (closing earlier and opening later).

What functionality is indicated by release codes 200 and 300?

Code 200 denotes an MCCB configuration equipped exclusively with an instantaneous electromagnetic release. Code 300 indicates a compound protection setup containing both thermal (overload) and electromagnetic (short-circuit) trip units.

What are the environmental protection grades and installation categories?

The entire SJKM1 series complies with standard industrial classifications featuring Pollution Degree Grade 3 and belongs to Installation Category III.

Wholesale SJKM1 Moulded Case Circuit Breaker (MCCB) from China Suppliers for Reliable Power Protection in Factories Manufacturers, Manufacturer

Product Description

Type Designation

Product Display

N - Pole Type Code

Release Modes and Accessory Codes

Normal Operating Conditions and Installation Conditions

Main Parameters and Technical Performances

Appearance and Installation Dimensions

Frequently Asked Questions (FAQ)

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