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

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

The SJKM5DC(PV) Direct Current Molded Case Circuit Breaker delivers specialized protection for 1500V solar arrays. With 800A breaking capacity and adaptive thermal tripping (derating above 40°C), this DC molded case breaker excels in Category III environments. Its corrosion-resistant housing withstands conductive dust and temperature cycling (-5°C to +50°C), while the arc-control technology minimizes downtime in utility-scale PV systems. The SJKM5DC series is UL-certified for non-explosive environments, offering maintenance-free operation for DC distribution and inverter isolation.

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Product Description

Type Designation

1	Manufacturer Code
2	Molded Case Circuit Breaker
3	Design Serial Number
4	PV: Photovoltaic Special \| DC: Direct Current Special
5	Frame Size Rating
6	Number of Poles
7	Accessory Code (See Table Below)
8	Rated Current
9	Operating Voltage

Accessory Code Table
Accessory	None	Alarm Contact	Shunt Release	Shunt+Alarm	Auxiliary Contact	Auxiliary+Alarm	Shunt+Auxiliary	Shunt+Auxiliary+Alarm	Two Auxiliaries	Two Auxiliaries+Alarm
Accessory Code	00	08	10	18	20	28	40	48	60	68

Product Display

SJKM5DC Direct Current Molded Case Circuit Breaker 1

SJKM5DC Direct Current Molded Case Circuit Breaker 3

SJKM5DC Direct Current Molded Case Circuit Breaker 4

SJKM5DC Direct Current Molded Case Circuit Breaker 5

Technical Parameters

Product Model		SJKM5DC
Frame Size Rating		250		315		400		630		800
Rated Current (A)		63A, 80A, 100A, 125A, 140A, 160A, 180A, 200A, 225A, 250A		250A, 315A, 350A, 400A		400A, 500A, 630A		630A, 700A, 800A
Nominal Insulation Voltage (V)		1500V
Rated Impulse Withstand Voltage (KV)		12KV
Type		DC	PV	DC	PV	DC	PV	DC	PV	DC	PV
Rated Operating Voltage (V)	2P Shape	DC250V, DC500V, DC750V, DC1000V, DC1500V				DC250V, DC500V, DC750V, DC1000V, DC1500V
Rated Operating Voltage (V)	3P Shape	DC1000V, DC1250V, DC1500V				DC1000V, DC1500V
Rated Ultimate Short-Circuit Breaking Capacity (kA)	2P Shape	DC1000V: 15 DC1500V: 5	DC250/500V: 50 DC750/1000V: 25 DC1500V: 7.5	DC1000V: 15 DC1500V: 5	DC250/500V: 50 DC750/1000V: 25 DC1500V: 7.5	DC250/500V: 25 DC750/1000V: 15 DC1500V: 10	DC250/500V: 50 DC750/1000V: 25 DC1500V: 10	DC250/500V: 25 DC750/1000V: 15 DC1500V: 10	DC250/500V: 50 DC750/1000V: 25 DC1500V: 10	DC250/500V: 25 DC750/1000V: 15 DC1500V: 10	DC250/500V: 50 DC750/1000V: 25 DC1500V: 10
Rated Ultimate Short-Circuit Breaking Capacity (kA)	3P Shape	DC1500V: 20	DC1000/1250/1500V: 25	DC1500V: 20	DC1000/1250/1500V: 25	DC1000V: 30 DC1500V: 25	DC1000V: 40 DC1500V: 30	DC1000V: 30 DC1500V: 25	DC1000V: 40 DC1500V: 30	DC1000V: 30 DC1500V: 25	DC1000V: 40 DC1500V: 30
Rated Short-Circuit Breaking Capacity (kA)		100% Icu
Connection Mode		2P Shape (Figure 1), 3P Shape (Figure 2)				2P Shape (Figure 1), 3P Shape (Figure 3)
Isolation Function		YES
Selective Category		A
Mechanical Life (Cycles)		20,000				10,000
Electrical Life (Cycles)		1,500				1,000		800		500
Flashover Distance (mm)	2P Shape	≤50	≤100	≤50	≤100
Flashover Distance (mm)	3P Shape	200 × 73 × 135				270 × 130 × 156
Overall Dimensions (mm)		200 × 107 × 135				310 × 182 × 156
Reference Ambient Temperature (℃)		-

Internal & External Accessories

Alarm Switch

Function: The Alarm Switch features an intelligent alarm system that automatically triggers a fault signal when tripped by overload, short circuit, or external release, while remaining inactive during normal operations - making it ideal for automation system integration.

Tripping Characteristics:

Auxiliary Switch

Function: Equipped with dual-contact auxiliary switches (NO+NC), the SJKM1E ECB provides real-time remote status monitoring and interlocking by reversing contact states during opening/closing operations.

Tripping Characteristics:

Shunt Release

Function: A shunt release is a device that remotely trips a circuit breaker using electric current; it automatically cuts off the signal circuit after the circuit breaker has tripped.

Tripping Characteristics:

Voltage Specification	AC50Hz: 24V, 110V, 230V, 400V \| DC: 24V, 110V, 220V
Tripping Characteristics	When the control voltage is between 70% and 110% of the rated value, the shunt release can trip the circuit breaker.

Outline & Installation Dimensions

Model Specification	Overall Dimensions (mm)								Mounting Dimensions (mm)
Model Specification	L	W	H	L1	L2	W1	H1	H2	a	b	4-Ød
250/2P	200	76	135	10.5	9.5	22	98	26	/	161	4.5
250/3P	200	107	135	10.5	9.5	22	98	26	35	161	4.5
400/2P	257	140	170	16	10.5	30	94	36	43.5	197	6.5
400/3P	257	184	170	16	10.5	30	94	36	43.5	197	6.5
630/2P	257	140	170	16	10.5	30	94	36	43.5	197	6.5
630/3P	257	184	170	16	10.5	30	94	36	43.5	197	6.5

* Conductor Cross-Section
Rated Current (A)	63	80	100	125/140	160	180/200/225	250	280/300/315	350/400	500/630	700/800
Wire Cross-Section (mm²)	16	25	35	50	70	90	120	Copper Bar 20×5×2	Copper Bar 40×5	Copper Bar 40×8	Copper Bar 40×5×2

Frequently Asked Questions (FAQ)

What applications are best suited for the SJKM5DC series circuit breaker?

The SJKM5DC series is engineered specifically for direct current (DC) installations, notably large-scale solar photovoltaic (PV) power systems, DC energy storage, and industrial DC power distribution setups requiring up to 1500V DC protection.

What is the highest operational voltage supported by the SJKM5DC?

The SJKM5DC circuit breaker supports operating voltages up to DC 1500V across both 2P and 3P structural configurations, featuring a rated insulation voltage (Ui) of 1500V.

What accessories can be installed with the SJKM5DC?

It accommodates internal and external accessories including Alarm Contacts, Auxiliary Contacts (NO+NC), and Shunt Releases, available as individual units or combined accessory configurations.

What is the breaking capacity performance of this DC MCCB?

The SJKM5DC provides high breaking capability with rated service short-circuit breaking capacity (Ics) certified at 100% of the ultimate short-circuit breaking capacity (Icu), ensuring reliable performance under critical fault conditions.

What are the mechanical and electrical endurance ratings?

Depending on frame rating, the SJKM5DC supports mechanical endurance up to 20,000 operations and electrical endurance ranging between 500 to 1,500 operations.

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

Product Description

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