SWM3Z is a series of high‑voltage DC molded case circuit breakers (MCCB) for energy storage systems, featuring non‑polarity design, compact size, 1000V–1500V DC, 125A–800A, unique arc extinguishing, ideal for industrial & commercial ESS DC side protection.
SWM3Z series is a professional DC molded case circuit breaker designed for industrial and commercial energy storage system (ESS) DC side protection. It features a compact high‑voltage structure, non‑polarity design for easier wiring, and unique arc extinguishing technology. Available in 125A–800A, 1000V–1500V DC, 2P/3P/4P, it provides safe and reliable overcurrent and short‑circuit protection for large‑power DC systems.
Key Features
Compact size with high DC voltage capability (up to 1500V)
Non‑polarity design for easier and more flexible wiring
Unique arc extinguishing system with short arc flight distance
Wide current range: 125A–800A
Wide voltage range: 1000V–1500V DC
2P / 3P / 4P pole options
High impulse withstand voltage (12kV)
Stable performance for energy storage scenarios
DIN‑rail / panel mounting compatible
Technical Parameters
Type
Frame current Inm(A)
Rated Current (A)
Pole
Rated Voltage (V)
Rated Insulation Voltage(V)
Rated Impulse Withstand Voltage (V)
SWM3Z-250H
250
125.140.160.180.200.225.250
2
1000
1000
12000
3
1250
1500
3
1500
SWM3Z-320H
320
280.315.320
2
1000
1000
3
1250
1500
3
1500
SWM3Z-400H
400
315.350.400
4
1000
SWM3Z-630H
630
400.500.630
4
1250
1500
SWM3Z-800H
800
630.700.800
4
1500
Application Scenarios
Industrial & Commercial Energy Storage Systems (ESS)
Battery Energy Storage Cabinets & Containerized Systems
DC Power Distribution for Energy Storage Stations
PV‑Storage Integrated Power Systems
Industrial DC Microgrids
Large Battery Charging & Discharging Systems
Data Center Backup DC Power
Company Introduction
Zhejiang Singi Electrical LLC
SINGI is a professional manufacturer of high‑voltage DC circuit breakers, MCCBs, PV protection devices, and energy storage electrical components. With advanced R&D capabilities and strict quality control, we focus on providing safe, reliable, and certified protection solutions for global energy storage, photovoltaic, and industrial DC power systems.
FAQ
Q: What is the benefit of “non‑polarity design” in SWM3Z DC MCCB for energy storage systems?A: Non‑polarity design means the breaker can be installed without distinguishing positive and negative DC lines. This greatly simplifies wiring, reduces installation errors, improves construction efficiency, and enhances safety in high‑voltage energy storage systems.
Q: Why is a dedicated DC MCCB necessary for energy storage systems instead of an AC MCCB?A: DC current has no zero‑crossing point, making arc extinguishing extremely difficult. AC MCCBs cannot safely break DC arcs and may cause continuous arcing, burnout, or fire. SWM3Z uses a dedicated DC arc extinguishing system for safe and reliable protection.
Q: Why is short arc flight distance an important safety feature in energy storage applications?A: In compact energy storage cabinets, short arc flight distance prevents high‑temperature arcs from igniting surrounding components or cables. This greatly reduces fire risk and improves the safety and stability of the entire battery system.
Q: Can SWM3Z be used in both 1000V and 1500V DC energy storage systems?A: Yes. The SWM3Z series covers 1000V, 1250V, and 1500V DC models. It is fully compatible with both traditional low‑voltage and modern high‑voltage energy storage systems, making it highly versatile for different project configurations.
Q: How does the SWM3Z MCCB protect battery packs in energy storage systems?A: It quickly detects and interrupts overcurrent and short‑circuit faults in the DC circuit, preventing thermal runaway, fire, and explosion risks in battery modules. Its fast arc extinguishing minimizes damage during fault conditions.
Q: What is the difference between SWM3Z and ordinary DC breakers in high‑power ESS?A: SWM3Z supports higher voltage (1500V) and larger current (800A) with non‑polarity wiring and compact structure. Ordinary DC breakers lack these features and cannot meet the safety and space requirements of large‑scale energy storage.
Singi Electrica is China manufacturer & supplier who mainly produces miniature circuit breaker, MCCB, SPD,distribution box , junction box with 24 years of experience. Hope to build business relationship with you.
