China SJKM1L Earth Leakage Circuit Breaker ELCB for Industrial Safety Factory, Companies

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China SJKM1L Earth Leakage Circuit Breaker ELCB for Industrial Safety Factory, Companies

The SJKM1L Earth Leakage Circuit Breaker ELCB provides comprehensive electrical protection for 400V/50Hz systems (up to 800A). This SJKM1L ELCB combines overload, short-circuit, and 30mA-30A residual current protection to prevent fire hazards from ground faults. Available in M-type (molded case) and H-type (high-breaking capacity) versions, it features 800V insulation and vibration resistance. The breaker's compact design allows for both vertical and horizontal installation in distribution panels. This SJKM1L ELCB is ideal for motor circuits, industrial plants, and power distribution systems requiring infrequent switching and reliable earth leakage protection.

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Product Description

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 Angle View

SJKM1L Earth Leakage Circuit Breaker Front View

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	Level	L	M	L	M	L	M	L	M
	AC400V (Icu)	35 / 50		35 / 50		50 / 65		50 / 65
	AC400V (Ics)	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 Residual Non-Operating 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		5000
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 (Rear-Panel Wiring)

Circuit breaker rear - panel wiring

Model	Overall Dimensions (mm)					Installation Dimensions (mm)
	Overall Dimensions (mm)					a1		b1		ΦD	Φd
	L1	L2	L3	H1	H2	3P	4P	3P	4P	ΦD	Φd
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

Plug-in type rear-panel wiring dimensions

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 / 800	3	210	280	155	116	70	243	4×Φ7
SJKM1LE-630 / 800	4	280	280	155	116	140	243	6×Φ7

Frequently Asked Questions (FAQ)

What does the SJKM1L series MCCB protect against?

The SJKM1L series Molded Case Circuit Breaker provides comprehensive protection against overloads, short-circuits, and residual current (earth leakage), guarding electrical circuits and equipment from fire hazards and electrocution.

What frame sizes and rated currents are available?

The available frame sizes are 125A, 250A, 400A, 630A, and 800A, with rated current options covering a wide range starting from 16A up to 800A across different frame configurations.

What are the available operation and control methods?

The circuit breakers support three operation types: standard manual toggle operation, rotary handle mechanism (Z), and motorized electric mechanism (D).

What is the difference between non-delay and delay type residual current protection?

Non-delay types offer immediate tripping upon residual fault detection (breaking time from 0.04 to 0.4 seconds) for personal safety, while delay types allow a calibrated time delay (up to 2.15 seconds) to achieve selectivity in distribution panels.

What wiring and installation configurations are supported?

The breaker series accommodates front-panel wiring, rear-panel wiring, and plug-in type rear-panel wiring solutions to suit various switchboard and enclosure integration requirements.

China SJKM1L Earth Leakage Circuit Breaker ELCB for Industrial Safety Factory, Companies

Product Description

Type Designation

Product Display

Trip - Opening Method and Accessory Code

Main Parameters and Technical Performances

Outline and Installation Dimensions

Frequently Asked Questions (FAQ)

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