Item No.: LYM9H-Z

LYM9H-Z MCB

Description：

Scope of application
LYM9H-Z DC circuit breaker is used for Dc voltage up to 600V, rated current up to 63A for overload and short circuit protection, and it can also be used for infrequent operation and conversion of the line. The circuit breaker is used in Dc panels,energy storage devices,etc.DC non-polar applications.
Compliant with:GB 14048.2,IEC 60947-2,IEC 60947-2 Annex P
Product Features: double busbars, transparent logo, quick closing function and independent appearance patent.

🔹 Product: LYM9H-Z DC Miniature Circuit Breaker

The LYM9H-Z is a high-performance DC miniature circuit breaker designed for high-voltage direct current systems, providing dependable overload and short-circuit protection in solar PV, battery storage, and DC distribution networks.

🔹 Key Technical Knowledge

Protection type: Thermal-magnetic DC protection
Rated voltage: Suitable for high-voltage DC systems (up to 1000 VDC applications)
Arc suppression: Optimized DC arc-extinguishing structure for non-zero-crossing currents
Installation: 35 mm DIN rail mounting
Application focus: DC power distribution and renewable energy systems
Manufacturer role: Factory-direct DC MCB manufacturer with OEM / ODM capability

🔹 Why choose LYM9H-Z?

Designed specifically for high-energy DC fault interruption, not adapted from AC breakers
Enhanced arc-blowout design improves safety in PV and battery circuits
Stable tripping characteristics under long-term DC load conditions
Compact modular housing suitable for dense DC cabinets and combiner boxes

🔹 OEM & Manufacturing Advantage

As a professional DC circuit breaker manufacturer and factory, we support bulk supply, OEM branding, customized voltage ratings, and private-label solutions for solar EPCs, system integrators, and global distributors.

🔹 Use Cases / Industries

Solar PV string protection
Battery energy storage systems (BESS)
DC combiner boxes
EV charging DC distribution
Telecom and industrial DC power systems

FAQs

1. What is the LYM9H-Z DC Miniature Circuit Breaker designed for?
The LYM9H-Z DC MCB is engineered for direct current (DC) applications with rated voltages up to high DC levels (e.g., up to 1000 VDC), providing reliable protection against overload and short circuits in DC power networks such as photovoltaic systems and battery storage arrays.

2. How does this DC MCB differ from standard AC circuit breakers?
Unlike AC breakers, DC MCBs like LYM9H-Z are built to handle continuous DC arcs that do not self-extinguish; internal magnetic arc-blowout and thermal-magnetic trip systems ensure stable DC protection. (DC systems lack zero crossing, requiring specific DC arc suppression methods.)

3. What safety standards and testing criteria does LYM9H-Z conform to?
This DC circuit breaker is manufactured to comply with robust industrial quality and safety expectations and integrates features designed for high DC fault interruption, aligning with global expectations for low-voltage DC protection devices.

4. Can the LYM9H-Z be used for frequent switching operations?
Yes. The device is built with long mechanical and electrical endurance, suitable for multiple switching cycles in DC circuits without degradation in performance.

5. Is this product suitable for OEM and bulk supply?
Absolutely. As a professional DC MCB manufacturer and factory supplier, we support OEM/ODM customization, private-label options, and bulk production for global distributors and system integrators.