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Configuration: IP65 waterproof enclosure, 4 /6fuses, 1 DC circuit breaker, 1 surge protector, for a 4 and 6string solar system.

  • 600v 1000v for solar PV application
  • 4 /6 In 1 Out
  • IP65 Protection Level
  • Easy to install
  • RoHS material

Stable Delvery Time

Technical Support

2 Years

Moreday MDJB-4B6B DC Combiner Box

Moreday MDJB-4B/6B DC Combiner Box

The Moreday MDJB-4B/6B DC Combiner Box is engineered to streamline solar energy systems, both grid-connected and off-grid, ensuring peak efficiency and safety. Its advanced configuration includes a dedicated high-voltage lightning arrester, DC fuse, and circuit breaker, providing essential protection against short circuits and lightning strikes. This combiner box not only safeguards your photovoltaic panels and inverters from over-voltage and over-current but also enhances system reliability and maintainability.

Robust and Reliable Design

Moreday MDJB-4B6B DC Combiner Box Designed with an IP65

Designed with an IP65 rating, the MDJB-4B/6B combiner box is fully equipped to withstand harsh environmental conditions, featuring waterproof, dustproof, and anti-UV properties.

It undergoes rigorous high and low-temperature testing to guarantee reliability across diverse climates.

Moreday MDJB-4B6B DC Combiner Box It undergoes rigorous high
Moreday MDJB-4B6B DC Combiner Box The ease of installation

The ease of installation and simplified system wiring further enhance the user experience, promoting a hassle-free setup.

Technical Specifications

Moreday MDJB-4B6B DC Combiner Box Technical Specifications

Model Code: MDJB-PV4/1(6/1)
Rated Voltage: 500V~600V
Operation: 4/6 strings in, 1 string out
Protection Class: IP65, ensuring dust and water resistance
Materials: Polycarbonate / ABS with UV resistance and flame retardancy
DC Circuit Breaker: 63A, 500V~600V
DC SPD: Max Operating Voltage 1000V, Max Discharge Current 40KA, Nominal Discharge Current 20KA
DC Fuse: 15A with finger-safe touch

Why Choose Moreday?

Selecting Moreday means partnering with a leader in the photovoltaic industry, recognized for its commitment to quality and innovation.

With over 15 years of experience, Moreday has delivered more than 5 GW of products globally, supported by robust patents and compliance with international standards (CQC, CE, CB, TUV, ROHS).

Our products are used in major solar projects worldwide, from Santiago, Chile to Ontario, Canada, showcasing our global reach and reliability.






Rated Voltage








Temperature Range


Protection Class



Polycarbonate / ABS


UV resistance and Flame retardant

DC Circuit Breaker

Rated Voltage


Rated Current



Max Operating Voltage


Max Discharge Current


Nominal Discharge Current


DC Fuse

Rated Voltage


Fuse Link

15A 10*38mm

Finger Safe Touch


popular questions


1. What is a DC combiner box and why do I need one in my solar power system?

A DC combiner box is a critical component in a solar panel system. It consolidates the output from multiple strings of solar panels into a single output that feeds into the solar inverter. This setup enhances safety by providing over-current and over-voltage protection, thereby protecting your photovoltaic panels and inverters from potential damage.

2. Can the MDJB-4B/6B be used in both off-grid and on-grid solar systems?

Yes, the MDJB-4B/6B DC Combiner Box is designed to be versatile and can be used effectively in both off-grid and on-grid solar power systems. Its robust configuration ensures optimal performance and protection in any setup.

3. What type of protective features does the MDJB-4B/6B offer?

The MDJB-4B/6B includes several protective measures such as a high-voltage lightning arrester, DC fuse, and a circuit breaker. These features work together to provide short circuit fault protection, lightning protection, and safeguard against over-voltage and over-current situations.

4. How does the IP65 rating benefit my installation?

The IP65 rating of the MDJB-4B/6B ensures that it is dust-tight and protected against water jets from any direction, making it suitable for outdoor installations and various harsh environmental conditions. This rating provides assurance that the combiner box will function effectively regardless of dust, rain, or other weather elements.

5. What are the warranty terms for the MDJB-4B/6B DC Combiner Box?

The MDJB-4B/6B comes with a 2-year warranty that covers defects in materials and workmanship. This warranty does not cover consumables such as fuses, which are subject to normal wear and tear.

6. Are there any special considerations for installing the MDJB-4B/6B?

Installation of the MDJB-4B/6B should always be performed with the power off and ideally by a professional electrical engineer. Ensure that all cable glands are properly tightened to maintain the IP65 protection. It's important to follow all safety guidelines to ensure a safe and effective installation.

7. How does the MDJB-4B/6B improve the maintainability of solar power systems?

By simplifying the wiring and reducing the number of connections from photovoltaic arrays to the inverter, the MDJB-4B/6B makes it easier to maintain the system. This streamlined setup not only enhances system reliability but also reduces maintenance time and costs.

8. Can the MDJB-4B/6B handle high power applications?

Yes, the MDJB-4B/6B is designed to handle high power applications effectively. It supports a maximum operating voltage of 1000V and a rated current of up to 63A, making it suitable for large-scale solar installations.

9. What customer support does Moreday offer for the MDJB-4B/6B?

Moreday offers comprehensive customer support, including detailed installation guides, troubleshooting assistance, and a responsive service team. Our experts are available to help with any questions or issues you may encounter.

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