High-Quality SJKM8 Moulded Case Circuit Breaker MCCB Suppliers, Company

1 / 5

High-Quality SJKM8 Moulded Case Circuit Breaker MCCB Suppliers, Company

The SJKM8 Moulded Case Circuit Breaker (MCCB) delivers reliable circuit protection for 50/60Hz systems with 690V insulation and current ratings from 100A to 630A. Available in 1P, 2P, 3P, and 4P configurations, this MCCB supports manual, fixed, and plug-in mounting options for versatile panel integration. Compliant with IEC60947-2 & EN60947-2, the SJKM8 MCCB ensures robust performance in industrial and commercial applications. Its durable design provides overload and short-circuit protection, making it ideal for power distribution systems requiring high breaking capacity. The compact construction allows space-saving installation while maintaining superior arc-quenching performance.

Send Inquiry

Product Description

Type Designation

SJKM8 Moulded Case Circuit Breaker Model Designation

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

Technical Parameters

SJKM8 Series Circuit Breaker				SJKM8-100		SJKM8E-160/250		SJKM8-160/250		SJKM8-400		SJKM8-630
Pole Number				1, 2, 3, 4		3		3, 4		3, 4		3, 4
Control	Manual		Toggle handle	■		■		■		■		■
			Direct or extended rotary handle	■		■		■		■		■
Type	Fixed		Front connection	■		■		■		■		■
			Rear connection	-		■		■		■		■
	Plug-in		Front connection	■		■		■		■		■
			Rear connection	-		■		■		■		■
Electrical performance complies with IEC 60947-2 and EN 60947-2 standards
Rated Current (A) In 40℃				100		160/250		160/250		400		630
Rated Insulation Voltage (V) Ui				690		690		690		690		690
Rated Impulse Withstand Voltage (kV) Uimp				6		6		6		6		6
Rated Working Voltage (V) Ue AC 50/60Hz				500		500		500		500		500
Circuit Breaker Type				N	H	N	H	N	H	N	H	N	H
Ultimate Breaking Capacity (kA rms) Icu	AC 50/60Hz		220/240V	50	65	50	85	50	85	85	100	85	100
			380/400V	25	35	25	36	25	36	36	50	36	50
			415V	25	30	25	36	25	36	36	50	36	50
			440V	20	20	20	25	20	25	36	50	36	50
			500V	10	10	8	10	8	10	20	36	20	36
Service Breaking Capacity (kA rms) Ics	AC 50/60Hz		220/240V	25	30	25	43	25	43	43	50	43	50
			380/400V	13	17	13	18	13	18	18	25	18	25
			415V	7	7	13	18	13	18	18	25	18	25
			440V	5	5	10	13	10	13	18	25	18	25
			500V	3	3	4	5	4	5	10	18	10	18
Isolation Function				■		■		■		■		■
Application Category				A		A		A		A		A
Maximum Expected Maintenance Value (C-O Cycle)		Mechanical		8500		10000		10000		6000		6000
		Electrical 440V In		4000		5000		5000		1000		1000
Protection
Release				Thermo-magnetic		Thermo-magnetic		Thermo-magnetic		Thermo-magnetic		Thermo-magnetic
Overload Protection	Long-time Delay		Ir(In×…)	■		■		■		■		■
Short-Circuit Protection	Short-time Delay		Isd(In×…)	-		-		-		-		-
	Instantaneous		Ii(In×…)	■		■		■		■		■
Leakage Protection	Circuit Breaker with Complete Leakage Protection			-		-		■		■		■
	Vigirex Relay			■		■		■		■		■
Indication and Control Auxiliaries
Auxiliary Contact (FZ) and Alarm Contact (BJ)				■		■		■		■		■
Auxiliary Alarm Contact (FZ/BJ)				■		■		■		■		■
Shunt Trip Coil (FL)				■		■		■		■		■
Under-Voltage Coil (QY)				■		■		■		■		■
Modbus Communication
Pm200 Meter	Electrical Measurement (Current, Voltage, Power, Energy)			■		■		■		■		■
Mc Multi-Circuit Monitoring Unit	Status			■		■		■		■		■
	Electrical Measurement (Current, Voltage)			■		■		■		■		■
Installation
Accessories	Terminal Expansion and Extension			■		■		■		■		■
	Terminal Cover			■		■		■		■		■
	Phase Separator			■		■		■		■		■
Circuit Breaker Type				N/H		N/H		N/H		N/H		N/H
Dimensions (mm) W×H×D	Fixed Front Connection		1P	25×130×60		-		-		-		-
			2P	50×130×60		-		-		-		-
			3P	75×130×60		105×165×60		105×165×68		140×257×103		140×257×103
			4P	100×130×60		-		140×165×68		185×257×103		185×257×103
Weight (kg)	Fixed Front Connection		1P/2P	0.28/0.48		-		-		-		-
			3P/4P	0.78/1.0		1.3		1.6/2.1		6.05/7.9		6.5/8.7

Product Display

SJKM8 Moulded Case Circuit Breaker View 2

SJKM8 Moulded Case Circuit Breaker View 3

SJKM8 Moulded Case Circuit Breaker View 4

SJKM8 Moulded Case Circuit Breaker View 5

SJKM8 Moulded Case Circuit Breaker View 6

Ambient Temperature Derating

SJKM8-100~630

Rated Current (A)	Environmental Temperature
Rated Current (A)	40℃	45℃	50℃	55℃	60℃	65℃	70℃
15	15.7	15.3	15	14.7	14.6	14.2	13.8
20	20.4	20.2	20	19.9	19.2	18.9	16.5
25	25.7	25.3	25	24.7	24.5	24.3	24.0
30	31.4	30.7	30	29.4	29.1	28.5	28.0
40	40.9	40.4	40	39.5	38.0	37.6	37.1
50	52.1	51.0	50	49.3	48.1	47.3	46.6
60	61.8	60.9	60	59.0	57.5	56.6	55.7
75	76.8	75.9	75	73.5	70.4	69.8	69.1
80	82.2	81.1	80	78.5	77.3	75.7	76.1
100	103	101	100	99.2	94.2	93.5	92.7
100	106.8	103.5	100	96.4	92.7	88.8	84.7
125	134.9	130	125	119.8	114.3	108.5	102.5
160	170.9	165.5	160	154.3	148.3	142.1	135.6
175	175	168	161	154	146	138	126
200	215	207.6	200	192	183.8	175.1	165.9
225	243.5	234.5	225	215.1	204.8	193.9	182.3
250	270.6	260.5	250	239	227.5	215.4	202.6
250	268	260	250	240	228	218	208
320	342	333	320	307	291	278	266
350	375	364	350	336	319	305	291
400	428	416	400	384	364	348	332
400	400	390.5	381	371.4	361.9	349.2	339.7
500	500	488.1	476.2	464.3	452.4	436.5	424.6
630	630	615	600	585	570	550	535

SJKM8-100 1P, 2P Fixed-type Power Distribution and Motor Protection

SJKM8-100 1P 2P Installation and Dimensions

① Outline Dimensions ② Chassis Installation ③ DIN Rail Installation ④ Front-of-Panel Opening (Small) ⑤ Front-of-Panel Opening (Large)

SJKM8-100 3P, 4P Fixed-type Power Distribution and Motor Protection

SJKM8-100 3P 4P Installation and Dimensions

① Outline Dimensions ② Chassis Installation ③ DIN Rail Installation ④ Front-of-Panel Opening (Small) ⑤ Front-of-Panel Opening (Large)

Frequently Asked Questions

What international standards does the SJKM8 MCCB comply with?

The SJKM8 series moulded case circuit breakers fully comply with the international standard IEC 60947-2 and the European standard EN 60947-2, ensuring high performance, electrical reliability, and safety.

What pole configurations and frame sizes are available?

The series covers rated frame currents ranging from 100A up to 630A. The SJKM8-100 model supports 1-pole, 2-pole, 3-pole, and 4-pole configurations, while higher frame sizes (160 to 630) are available in 3-pole and 4-pole versions.

What types of electrical protection does the SJKM8 series offer?

It comes equipped with thermo-magnetic release units delivering long-time delay overload protection (Ir) and instantaneous short-circuit protection (Ii). Furthermore, complete leakage protection models or Vigirex relay integrations are supported.

What mounting options and connection methods are supported?

SJKM8 circuit breakers support both fixed and plug-in mounting styles with front or rear wiring connection options. The SJKM8-100 series supports both chassis mounting and standardized DIN rail installation.

Can the SJKM8 be integrated into smart management systems?

Yes, the series supports Modbus communication, PM200 power meters for measuring current, voltage, power, and energy, as well as MC multi-circuit monitoring units for real-time status and telemetry tracking.

How does ambient temperature influence the operating current?

The rated current is calibrated based on a standard 40℃ ambient environment. When operating above 40℃ (up to 70℃), derating factors apply according to the ambient temperature compensation table provided above.

High-Quality SJKM8 Moulded Case Circuit Breaker MCCB Suppliers, Company

Product Description

Related Products

High-Quality SJKM8 Moulded Case Circuit Breaker MCCB Suppliers, Company

High-Quality SJKM5DC Direct Current Molded Case Circuit Breaker Supplier, Factories

High-Quality SJKM5 Industrial MCCB Breaker for Short-Circuit Protection Manufacturers, Manufacturer

High-Quality SJKM3 MCCB Moulded Case Circuit Breaker with Overload Protection Supplier, Company

High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer

OEM SJKM1 Moulded Case Circuit Breaker (MCCB) for Power Systems Supplier, Manufacturer

ODM SJKM1E Molded Case Circuit Breaker ECB Suppliers, Supplier

Wholesale SJKM3E Electronic Circuit Breaker (ECB) with Smart Protection Suppliers, Factory

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

Wholesale SJKM3L ELCB Earth Leakage Circuit Breaker with High Sensitivity Suppliers, Supplier