DC SG65-63 is a high-performance DC miniature circuit breaker with 6kA breaking capacity, available in 1P/2P/3P/4P configurations and 6A–63A rated current. It provides reliable overcurrent and short-circuit protection for DC power systems in photovoltaic, electric vehicle charging, rail transit, marine, and power station applications.
Key Features
- 1P / 2P / 3P / 4P pole options
- 6kA high breaking capacity
- Stable and mature DC protection technology
- Mechanical life up to 20,000 times
- Heat resistance: Class 2 (55°C, 95% humidity)
- Terminal clamp wiring, supports up to 25mm² cable
- Suitable for industrial DC, new energy, and transportation systems
- Supports OEM & ODM
- 20,000 ㎡ production base for mass supply
Technical Parameters
| Item | Specification |
|---|
| Model | DC SG65-63 |
| Breaking Capacity | 6kA |
| Poles | 1P, 2P, 3P, 4P |
| Rated Voltage | 230V, 400V DC |
| Rated Current | 6A,10A,16A,20A,25A,32A,40A,50A,63A |
| Power Factor | 0.65~0.70 / 0.75~0.80 |
| Mechanical Life | 20,000 times (off-on) |
| Heat Resistance | Class 2 (55°C, 95% RH) |
| Wiring Capacity | Max 25mm² cable |
| Application | DC Power Systems, PV, EV Charging, Rail Transit, Ships, Power Stations |
Remark:
1.mechanical life:20,000 times(off-on)
2.heat resistance: category 2 (temperature 55°C,relative humidity 95%).
3.wiring is terminal with clamp, cable dia.:25mm2
Current Release Character Diagram
Test current(A) | Rated current(A) | Requested time | Result | Start station | Remark |
1.13In | all | t>=1h | Don't trip | Cool |
|
1.45In | All | T<1h | trip | heat | Current ascends the requested value stably in 5s |
2.55In | In<=32A | 1s<t<60s | trip | Cool | Auxiliary switch closed, power is on |
2.55In | In>32A | 1s<t<120s | trip | Cool | Auxiliary switch closed, power is on |
3In(Bmode) | All | t>=0.1s | Don't trip | Cool | Auxiliary switch closed, power is on |
5In(Bmode) | All | T<0.1s | trip | Cool | Auxiliary switch closed, power is on |
5In(Cmode) | All | t>=0.1s | Don't trip | Cool | Auxiliary switch closed, power is on |
10In(Cmode) | All | T<0.1s | trip | Cool | Auxiliary switch closed, power is on |
10(Dmode) | All | t>=0.1s | Don't trip | Cool | Auxiliary switch closed, power is on |
14In(Dmode) | All | T<0.1s | trip | Cool | Auxiliary switch closed, power is on
|
FAQ
Q: Why should I use a dedicated DC MCB instead of an AC MCB in PV or EV systems?A: DC current has no zero-crossing point, making it much harder to extinguish arcs than AC. Ordinary AC MCBs cannot safely break DC arcs, which can cause burnout, fire, or explosion. DC SG65-63 uses a specially designed arc-extinguishing system for stable DC protection.
Q: What is the difference between B, C, D tripping curves for this DC MCB?A: B-curve trips at 3–5In for sensitive electronic loads. C-curve trips at 5–10In for general lighting and power. D-curve trips at 10–14In for high-inrush loads like motors, compressors, and EV charging modules.
Q: Why is 6kA breaking capacity important for DC power systems?A: 6kA breaking capacity ensures the MCB can safely cut off short-circuit current in photovoltaic arrays, battery systems, and EV charging piles without damage. It guarantees system safety under extreme fault conditions.
Q: Can this DC MCB be used in both positive and negative DC circuits?A: Yes. The structure and arc-extinguishing design support both polarities, making it widely used in battery packs, PV combiner boxes, and bidirectional DC power supply systems.
Q: What makes this MCB suitable for rail transit and ship power?A: It has strong heat resistance (Class 2, 55°C, 95% humidity), high mechanical life (20,000 times), and stable performance under harsh vibration and humidity environments typical in transportation.
Q: How does the 25mm² wiring capacity improve field application?A: Large wiring capacity supports thick cables used in high-power DC systems (PV, energy storage, EV charging), reducing heat generation, ensuring current carrying capacity, and improving long-term reliability.
Company Introduction
Zhejiang Singi Electrical LLC
SINGI is a professional manufacturer of low-voltage and DC electrical components with a 20,000 ㎡ production base. We specialize in DC circuit breakers, MCBs, RCBOs, AFDDs, and PV protection devices. With mature and stable R&D and production technology, we support mass production, OEM, and ODM services. Our products are widely used in new energy, industrial, commercial, transportation, and marine fields worldwide.
Application Scenarios
- Photovoltaic (PV) systems: DC combiner boxes, inverter input protection
- Electric vehicle charging piles: DC circuit protection
- Rail transit systems: train DC power supply
- Ship power systems: marine DC distribution
- Industrial DC power: battery packs, energy storage systems
- Power stations & backup power: DC load protection
- Automation & propulsion systems: DC control circuits
