China China SJKM1 Moulded Case Circuit Breaker (MCCB) Factory | Reliable Power Protection from Leading Suppliers Manufacturer, Company

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China China SJKM1 Moulded Case Circuit Breaker (MCCB) Factory | Reliable Power Protection from Leading Suppliers Manufacturer, Company

The SJKM1 Moulded Case Circuit Breaker (MCCB) is expertly engineered for AC power systems operating at 50/60Hz, accommodating voltages up to 690V and currents up to 1250A. This high-performance SJKM1 MCCB provides dependable protection against overloads, short circuits, and undervoltage conditions in diverse distribution networks. Models with frame sizes reaching 400A can effectively safeguard motors, making it an essential component for industrial and commercial applications. As a reliable product from a leading China factory, the SJKM1 complies with stringent standards such as IEC 60947-2 and GB14048.2, ensuring safe power distribution and optimal equipment protection. Its robust construction also supports infrequent switching and efficient motor starting. Choose our SJKM1 MCCB for reliable protection sourced from trusted suppliers in China.

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Product Description

Type Designation

SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-5

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-(MCCB)-(1)

SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(2)

SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(3)

SJKM1-Moulded-Case-Circuit-Breaker-(MCCB)-(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) (0-tCO)	400V	25	50	35	50	85	35	50	85	50	65	100	50	65	100	100		100
	690V					25			25			30			30			25
Service Short-Circuit Breaking Capacity Ics (kA) (0-tCOtCO)	400V	18	30	25	35	50	25	35	65	35	50	65	35	50	65	65		50
	690V					15			15			20			20			20

Appearance and Installation Dimensions

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

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)
		L	L1		W	H	H1		H2	a	b	φd	a1		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					---
	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					--
	4				142
SJKM1-400	3	257	105		149	150	100		36.5	44	195	6.5	44		225	32		70	120
	4				198
SJKM1-630	3	270	118		182	155	108		41	58	200	7	58		234	40		70	120
	4				240
SJKM1-800	3	282	102		210	158	103		34.5	70	243	7	70		243	48		70	125
	4				280
SJKM1-1250	3	406	104		210	190	140.5		58.5	70	375	10			-	-			-
手柄	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

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

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 does the type designation code of the SJKM1 Molded Case Circuit Breaker represent?

The type designation code of the SJKM1 MCCB includes information about the manufacturer code, molded case circuit breaker code, design code, frame size, short-circuit breaking capacity level, operation method, number of poles, trip unit method & file code, function code, and N-pole type code. Each position in the code corresponds to a specific parameter of the product.

What are the differences between the N-pole types (A, B, C, D) in the SJKM1 MCCB?

Types A and B have no over-current release element on the N-pole. Type A keeps the N-pole always connected (independent of other poles), while Type B operates the N-pole together with the other three poles (closing first, opening last). Types C and D have an over-current release element on the N-pole. Type C operates with the other poles (closing first, opening last), while Type D keeps the N-pole always connected.

What are the normal operating and installation conditions for the SJKM1 MCCB?

The SJKM1 MCCB operates normally at ambient temperatures from -5°C to +40°C, at altitudes not exceeding 2000m, with a pollution degree of Grade 3 and installation category of Category III. It can be installed horizontally, vertically, or flat without any reduction in electrical performance.

What breaking capacity levels are available for the SJKM1 MCCB series, and what do they mean?

The SJKM1 MCCB series offers four breaking capacity levels: E (Economy type), M (Standard type), H (Higher-reliability type), and L (High-breaking type). These codes indicate the short-circuit breaking capability and design reliability of the circuit breaker, with higher levels offering increased breaking capacity values (Icu/Ics) at rated voltages.

What accessories are available for the SJKM1 MCCB, and how are they coded?

The SJKM1 MCCB supports a variety of accessories including alarm contacts, shunt releases, auxiliary contacts, under-voltage releases, and combinations thereof. Each configuration is assigned a specific numeric code (e.g., 200 for no accessory, 210 for shunt release only, 220 for auxiliary contact, etc.). Both instantaneous and compound release modes have separate code tables.

What frame sizes and rated current ranges are available in the SJKM1 MCCB series?

The SJKM1 MCCB series covers a wide range of frame sizes from SJKM1-63 up to SJKM1-1250. Rated current ranges vary by frame: SJKM1-63 covers 10A–63A, SJKM1-125 covers 16A–125A, SJKM1-250 covers 100A–250A, SJKM1-400 covers 225A–400A, SJKM1-630 covers 400A–630A, SJKM1-800 covers 630A–800A, and SJKM1-1250 covers 800A–1250A, available in 2-pole, 3-pole, and 4-pole configurations.

China China SJKM1 Moulded Case Circuit Breaker (MCCB) Factory | Reliable Power Protection from Leading Suppliers Manufacturer, Company

Product Description

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