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SJKM1L Earth Leakage Circuit Breaker ELCB.jpg

SJKM1L Earth Leakage Circuit Breaker 4P.jpg

SJKM1L Earth Leakage Circuit Breaker For Electrical Use.jpg

SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory

The SJKM1L Earth Leakage Circuit Breaker (ELCB) is a vital electrical protection device designed for 400V/50Hz systems with a current rating of up to 800A. As a leading product from China, our SJKM1L ELCB ensures comprehensive safety by providing overload, short-circuit, and reliable residual current protection (30mA-30A) to mitigate fire risks associated with ground faults. Available in both M-type (molded case) and H-type (high-breaking capacity) versions, this circuit breaker offers superior insulation up to 800V and robust vibration resistance. Its compact design allows for versatile installation, whether vertical or horizontal, within distribution panels. Ideal for motor circuits, industrial plants, and power distribution systems, this SJKM1L ELCB is essential for applications requiring infrequent switching and dependable earth leakage protection. Partner with trusted suppliers and manufacturers in the industry to enhance your electrical safety infrastructure

Product Details

Type Designation

①	Manufacturer Code
②	Molded Case Circuit Breaker (MCCB)
③	Design Serial Number
④	With Residual Current Protection
⑤	Frame Size
⑥	Breaking Capacity: L (Standard) \| M (Medium) \| H (High)
⑦	Operation: None (Manual) \| Z (Rotary Handle) \| D (Motorized)
⑧	Poles: 3 (3-Pole), 4 (4-Pole)
⑨	Trip Type & Accessory Code (See Table 1)
⑩	Application Code: None (Distribution) \| 2 (Motor Protection)
⑪	4-Pole Code (A/B/C/D for Neutral), 3-Pole: No Code
⑫	Alarm Module: Ⅰ (Alarm + Trip) \| Ⅱ (Alarm Only)

Notes:
Frame Size: 1N25 (125A), 2N50 (250A), 4N00 (400A), 6N30 (630A), 8N00 (800A)

Product Display

SJKM1L Earth Leakage Circuit Breaker (1)

SJKM1L Earth Leakage Circuit Breaker (4)

Trip - Opening Method and Accessory Code

Main Parameters and Technical Performances

Model		SJKM1LE-125		SJKM1LE-250		SJKM1LE-400		SJKM1LE-630、800
Maximum Rated Current of Shell Frame Grade A		125		250		400		800
Rated Current In A		16 20 25 32 40 50 63 80 100 125		125 160 180 200 225 250		250 315 350 400		400 500 630 700 800
Number of Poles		3	4	3	4	3	4	3	4
Rated Insulation Voltage Ui V		AC800
Rated Working Voltage Ue V		AC400
Rated Impulse Withstand Voltage Uimp V		8000
Arc-Quenching Distance mm		50		50		100		100
Breaking Capacity Icu / Ics		L	M	L	M	L	M	L	M
	AC400V	35 50		35 50		50 65		50 65
	AC400V	22 35		25 35		35 42		35 42
Rated Residual Short-Circuit Making (Breaking) Capacity Icu/4		8.75		12.5		15.75		16.25
Rated Residual Operating Current I△n (mA)	Non-delay type	30/50/100 100/300/500		30/50/100 100/300/500		100/300/500		300/500/1000
	Delay type	100/300/500		100/300/500		100/300/500		300/500/1000
Rated Non-operating Residual Current		1/2I△n		1/2I△n		1/2I△n		1/2I△n
Number of Operating Performances	Energized	1500		1000		1000		1000
	De-energized	8500		7000		4000		4000
	Total number of times	10000		8000		5000		500
Operating Time of Residual Current Protection		2I△n		2I△n		5I△n		10I△n
Maximum Breaking Time (S)	Non-delay type	0.2		0.1		0.4		0.04
	Delay type	0.5/1.15/2.15		0.35/1/2		0.25/0.9/1.9		0.25/0.9/1.9

Outline and Installation Dimensions

◆ Outline and Installation Dimensions of the Circuit Breaker After Wiring

Circuit breaker rear-panel wiring

Model	Overall Dimensions (mm)					Installation Dimensions (mm)
	L1	L2	L3	H1	H2	a1		b1		ΦD	Φd
						3P	4P	3P	4P
SJKM1LE-125	162	132	35	53	93	72	102	90	132	22	5.5
SJKM1LE-250	173	144	35	55	100	87	122	93	144	24	5.5
SJKM1LE-400	267	224	37	48.5	108.5	124	172	164	224	26	6.5
SJKM1LE-630/800	295	243	37	62	62	178	248	158	243	48	7.0

◆ Outline and Installation Dimensions of Plug-in Type Rear-panel Wiring

Model	w		L	A	H1	G	G1	a		b	Φd
Model	3P	4P	L	A	H1	G	G1	3P	4P	b	Φd
SJKM1LE-125	91	125	168	38	50	33	28	60	90	56	6.5
SJKM1LE-250	107	145	186	46	50	33	37	70	105	54	6.5
SJKM1LE-400	149	200	280	55	60	38	46	60	108	129	8.5
SJKM1LE-630/800	210	280	305	62	87	60	22	90	162	146	11

◆ Outline and Installation Dimensions of the Circuit Breaker with Front-panel Wiring

Circuit Breaker Front Terminal

Model	Pole	Overall Dimensions (mm)				Installation Dimensions (mm)
Model	Pole	L1	L2	L3	L4	a	b	Φd
SJKM1LE-125	2	65	151	110	75		129	2×Φ4.5
	3	93	151	110	92	30	129	4×Φ4.5
	4	123	151	110	92	60	129	6×Φ4.5
SJKM1LE-250	2	75	165	110	90		129	2×Φ4.5
	3	107	165	110	90	35	126	4×Φ4.5
	4	142	165	110	90	70	126	6×Φ4.5
SJKM1LE-400	3	154	257	146	106	44	194	4×Φ4.5
SJKM1LE-400	4	198	257	146	106	94	194	6×Φ4.5
SJKM1LE-630 SJKM1LE-800	3	210	280	155	116	70	243	4×Φ7
SJKM1LE-630 SJKM1LE-800	4	280	280	155	116	140	243	6×Φ7

Frequently Asked Questions (FAQ)

What does SJKM1LE stand for in the type designation?

The SJKM1LE designation is a structured code: "SJ" represents the manufacturer code, "KM1" denotes the Molded Case Circuit Breaker (MCCB) series and design serial number, "L" indicates residual current (earth leakage) protection, and "E" identifies the frame size and breaking capacity level. Each segment provides specific information about the product's configuration and capabilities.

What are the available frame sizes for the SJKM1LE series?

The SJKM1LE series is available in five frame sizes: 1N25 (125A), 2N50 (250A), 4N00 (400A), 6N30 (630A), and 8N00 (800A). Each frame size corresponds to a specific maximum rated current and is designed for different load requirements in electrical distribution systems.

What breaking capacity options are available for the SJKM1LE circuit breakers?

The SJKM1LE series offers two breaking capacity levels at AC400V: Standard (L) and Medium (M). For the 125A and 250A models, Icu values are 35kA (L) and 50kA (M). For the 400A, 630A, and 800A models, Icu values are 50kA (L) and 65kA (M). The corresponding Ics values are also available as specified in the technical parameters table.

What residual current (earth leakage) protection settings are available?

The residual operating current (I△n) settings vary by model. For SJKM1LE-125 and -250, non-delay types offer 30/50/100/300/500 mA, while delay types offer 100/300/500 mA. The SJKM1LE-400 supports 100/300/500 mA, and the SJKM1LE-630/800 supports 300/500/1000 mA. The non-operating residual current threshold is 1/2 I△n for all models.

What operation types are supported for the SJKM1LE series?

The SJKM1LE circuit breakers support three operation types: standard manual operation (no suffix), rotary handle operation (suffix Z), and motorized operation (suffix D). The motorized option allows for remote or automated switching, making it suitable for applications where manual access is limited or automatic control is required.

What wiring configurations are available for the SJKM1LE circuit breakers?

The SJKM1LE series supports three wiring configurations: standard rear-panel wiring, plug-in type rear-panel wiring, and front-panel wiring. Each configuration has specific outline and installation dimensions provided in the technical tables, covering both 3-pole and 4-pole versions. Refer to the dimension tables and diagrams in this page for exact measurements per model.