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SJKM5DC DC Molded Case Circuit Breaker 1500V for Solar Arrays - Top China Suppliers & Factory
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
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 | |||||||||||||
| 3P Shape | DC1000V, DC1250V, DC1500V | DC1000V, DC1500V | ||||||||||||||
| Rated Ultimate Short-Circuit Breaking Capacity (KA) | 2P Shape | DC1000V(2P):15 DC1500V(2P):5 |
DC250V,DC500V(2P):50 DC750V,DC1000V(2P):25 DC1500V(2P):7.5 |
DC1000V(2P):15 DC1500V(2P):5 |
DC250V,DC500V(2P):50 DC750V,DC1000V(2P):25 DC1500V(2P):7.5 |
DC250V,DC500V(2P):25 DC750V,DC1000V(2P):15 DC1500V(2P):10 |
DC250V,DC500V(2P):50 DC750V,DC1000V(2P):25 DC1500V(2P):10 |
DC250V,DC500V(2P):25 DC750V,DC1000V(2P):15 DC1500V(2P):10 |
DC250V,DC500V(2P):50 DC750V,DC1000V(2P):25 DC1500V(2P):10 |
DC250V,DC500V(2P):25 DC750V,DC1000V(2P):15 DC1500V(2P):10 |
DC250V,DC500V(2P):50 DC750V,DC1000V(2P):25 DC1500V(2P):10 |
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| 3P Shape | DC1500V(3P):20 | DC1000V,DC1250V,DC1500V(3P):25 | DC1500V(3P):20 | DC1000V,DC1250V,DC1500V(3P):25 | DC1000V(3P):30 DC1500V(3P):25 |
DC1000V(3P):40 DC1500V(3P):30 |
DC1000V(3P):30 DC1500V(3P):25 |
DC1000V(3P):40 DC1500V(3P):30 |
DC1000V(3P):30 DC1500V(3P):25 |
DC1000V(3P):40 DC1500V(3P):30 |
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| Rated Short-Circuit Breaking Capacity (kA) | 2P Shape | 100% Icu | ||||||||||||||
| 3P Shape | ||||||||||||||||
| Connection Mode | 2P Shape (Figure 1), 3P Shape (Figure 2) | 2P Shape (Figure 1), 3P Shape (Figure 3) | ||||||||||||||
| Isolation Function | YES | |||||||||||||||
| Selective Category Cat | A | |||||||||||||||
| Mechanical Life (Cycles) | 20000 | 10000 | ||||||||||||||
| Electrical Life (Cycles) | 1500 | 1000 | 800 | 500 | ||||||||||||
| Flashover Distance (mm) | 2P Shape | ≤50 | ≤100 | ≤50 | ≤100 | ≤100 | ||||||||||
| 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 | AC 50Hz: 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 Dimension (mm) | ||||||||||||||||||
| 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
QWhat is the SJKM5DC and what applications is it designed for?
The SJKM5DC is a Direct Current (DC) Molded Case Circuit Breaker (MCCB) designed for both standard DC systems and photovoltaic (PV) solar energy applications. It provides overcurrent and short-circuit protection in DC electrical systems with rated voltages up to 1500V DC, making it suitable for solar power plants, energy storage systems, and industrial DC distribution networks.
QWhat are the available frame size ratings and rated current ranges for the SJKM5DC?
The SJKM5DC is available in five frame sizes: 250A (63A–250A), 315A (63A–250A), 400A (250A–400A), 630A (400A–630A), and 800A (630A–800A). This wide range allows the breaker to be selected precisely for the load requirements of the application.
QWhat is the difference between the DC type and the PV type of the SJKM5DC?
The DC type is designed for general direct current applications, while the PV (Photovoltaic) type is specially optimized for solar energy systems. The PV type typically features higher short-circuit breaking capacities at various voltage levels (e.g., up to 50kA at DC250V/500V in 2P configuration), providing enhanced protection suited to the unique fault characteristics of photovoltaic installations.
QWhat accessories are available for the SJKM5DC circuit breaker?
The SJKM5DC supports a comprehensive range of internal and external accessories, including an Alarm Switch (fault signal output), Auxiliary Switch (NO+NC dual-contact for remote status monitoring), and a Shunt Release (remote tripping device). These can be combined in various configurations as indicated by the Accessory Code Table, with codes ranging from 00 (no accessory) to 68 (Two Auxiliaries + Alarm).
QWhat voltage range is required to operate the Shunt Release of the SJKM5DC?
The Shunt Release operates when the control voltage is between 70% and 110% of its rated value. It supports multiple voltage specifications: AC 50Hz at 24V, 110V, 230V, or 400V, and DC at 24V, 110V, or 220V. The shunt release automatically disconnects the signal circuit after the circuit breaker has successfully tripped.
QWhat is the mechanical and electrical service life of the SJKM5DC?
The mechanical life of the SJKM5DC is 20,000 operating cycles for the 250A and 315A frame sizes, and 10,000 cycles for larger frames (400A, 630A, 800A). The electrical life varies by frame size: 1,500 cycles for 250A, 1,000 cycles for 315A, 800 cycles for 400A and 630A, and 500 cycles for the 800A frame, ensuring reliable long-term performance in demanding environments.