SGB-80 is a high-performance DC miniature circuit breaker featuring single break structure and bidirectional protection.
It complies with UL489, IEC/EN 60947-2, and GB/T 14048.2 standards, with 10kA breaking capacity, widely used in
energy storage systems, EV charging piles, and PV combiner boxes.
Key Features
- Single break structure
- Bidirectional DC protection
- Compliant with UL489 standard
- 10kA high breaking capacity
- 1P / 2P / 3P / 4P optional
- Wide voltage range: 300V–1200V DC
- Rated current: 6A–80A
- Stable performance for new energy scenarios
- Easy DIN‑rail installation
Technical Parameters
| Rated Voltage(V) | Pole | Rated Current
(A) | Breaking Capacity
Icn (A) | Executive Standards |
| DC 300V | 1P | 6.10.16.20.25.
32.40.50.63.80A | 10000A | GB/T 14048.2
IEC/EN 60947-2 |
| DC 600V | 2P |
| DC 900V | 3P |
| DC 1200V | 4P |
Typical Applications
- Energy Storage Systems (ESS)：Battery packs, rack‑mounted energy storage, grid‑tied storage
- EV Charging Piles：Home chargers, commercial DC fast chargers
- PV Solar Systems：PV combiner boxes, inverter DC input protection
- Industrial DC Power：DC power distribution, automation equipment
- Commercial Buildings：Smart DC microgrids, backup power systems
Company IntroductionZhejiang Singi Electrical LLC
SINGI is a professional manufacturer of DC circuit breakers, MCBs, RCBOs, AFDDs, and PV protection devices. With advanced R&D and strict quality control, our products comply with IEC, EN, GB, and UL standards. We focus on new energy circuit protection, providing reliable solutions for photovoltaic, energy storage, EV charging, and industrial DC power systems worldwide.
FAQ
Q: What is the meaning of “bidirectional protection” for SGB-80 DC MCB, and why is it important?A: Bidirectional protection allows the MCB to safely interrupt current flow in both directions in a DC circuit. This is critical for battery energy storage and EV systems where current can charge or discharge, ensuring full protection in all operating modes.
Q: Why does compliance with UL489 matter for DC MCBs in global markets?A: UL489 is the key safety standard for circuit breakers in North America and many international markets. It ensures the product meets strict thermal, magnetic, and short‑circuit performance requirements, making SGB-80 suitable for global PV, energy storage, and EV charging projects.
Q: What is the difference between “single break” and “double break” in DC MCB design?A: Single break uses one contact gap to extinguish the DC arc, offering compact size and cost efficiency for most new energy applications. Double break uses two gaps for higher voltage systems. SGB-80 uses single break optimized for 300V–1200V DC with reliable arc extinction.
Q: Why is 10kA breaking capacity essential for PV and energy storage systems?A: PV arrays and battery stacks generate high short‑circuit current under fault conditions. 10kA breaking capacity ensures the MCB can safely disconnect faults without damage, preventing fire risks and protecting expensive equipment.
Q: Can the SGB-80 be used in both positive and negative DC busbar protection?A: Yes. Its bidirectional design and DC‑optimized arc chamber allow it to protect both polarities, making it ideal for combiner boxes, battery racks, and charging pile input/output circuits.
