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IP65 DC string box is designed for 1 to 16 strings solar PV system, CE CB TUV certificated.

  • 600V / 1000V for solar PV application
  • 1 to 16 strings input
  • 1 to 3 strings output
  • Housing: Pluggable design
  • Wall mount
  • RoHS material

Stable Delvery Time

Technical Support

2 Years

PV DC Combiner Box MDJB-A MDJB-B

PV DC Combiner Box MDJB-A / MDJB-B

Our MDJB PV DC Combiner Box stands out with its robust features designed to ensure the efficiency and reliability of your solar power systems. Engineered to accommodate multiple string configurations, these combiner boxes can handle up to 1000V of maximum working voltage and offer discharge currents up to 40 kA, ensuring your system’s safety against electrical surges. The inclusion of DC surge protectors, isolator fuses, and DC MCBs (Miniature Circuit Breakers) guarantees optimal protection and operational reliability.

Key Features

PV DC Combiner Box MDJB-A MDJB-B Versatile Configurations

Versatile Configurations

Available from single to multiple string inputs, facilitating flexibility in solar array designs.

Superior Protection

Rated with IP65/IP66, ensuring complete protection against dust, water, and external impacts.

PV DC Combiner Box MDJB-A MDJB-B Superior Protection
PV DC Combiner Box MDJB-A MDJB-B Durable Material

Durable Material

Constructed from high-quality PC/ABS materials that offer UV resistance and high mechanical strength.

Certified Quality

Adherence to international standards like EN 50539-11, IEC/EN 60947-3, and certifications such as CE, TUV, and CB, underscores our commitment to global quality standards.

Applicable Scenarios

PV DC Combiner Box MDJB-A MDJB-B Applicable Scenarios

Designed for both small-scale residential setups and large-scale commercial solar installations, the MDJB PV DC Combiner Box is an essential component in photovoltaic systems. It excels in various environments, ranging from harsh, remote areas with extreme temperatures to urban settings requiring sophisticated energy solutions.

Why Choose Moreday?

Selecting Moreday means partnering with a leader in solar technology that is deeply committed to innovation and sustainability. With over a decade of specialization in photovoltaic products and a global footprint in over 100 countries, we ensure:

Tailor-made Solutions: Customized services to meet specific project requirements.

Comprehensive Support: A global service network providing ongoing assistance and maintenance.

Sustainable Practices: A corporate philosophy centered around reducing the carbon footprint and enhancing green energy usage worldwide.





1-6 Strings


1/2 strings

Max Voltage


Max Current Input (Eachstring)





Degree of Protection




Input Cable Glands

PG09, 2.5-16

Output Cable Gland

PG21, 2.5-16

Operating temperature


DC surge protection

Maximum working voltage

1000 V

Maximum discharge current

40 kA

Executive Standard

EN 50539-11 Type 2



DC isolated switch/DC MCB

Rated insulation pad


Rated current




Executive Standard

IEC/EN 60947-3, UL508I


CE, TUV, CB,TUV Australia Approval

DC fuse

Rated working voltage


Rated current


Dimensions (W*H*D)

Φ10 * 38 mm

Executive Standard


Environmental parameters

Operating temperature





2000m(2000m Above derating)

Installation method

Wall-mounted installation

popular questions


1. What is the main function of the MDJB?

The MDJB is designed to consolidate multiple input strings from solar panels into a single output, enhancing the management and safety of solar power systems. It includes surge protection and circuit isolation to protect against electrical faults and ensure stable operation.

2. Can the MDJB PV DC Combiner Box be used in residential installations?

Yes, the MDJB is suitable for both residential and commercial solar installations. Its modular design allows for flexibility in solar array sizes, making it an ideal choice for home solar energy systems as well as larger commercial projects.

3. What certifications does the MDJB PV DC Combiner Box hold?

Our box is certified with CE, TUV, and CB standards, ensuring compliance with European and international safety and quality requirements. These certifications confirm the product’s reliability and safety in diverse operational environments.

4. How does the MDJB handle extreme weather conditions?

The MDJB is built to withstand harsh environmental conditions, with an operating temperature range from -25°C to +60°C. Its IP65/IP66 rated enclosure provides protection against dust, water ingress, and mechanical impacts, making it robust enough for challenging climates.

5. What materials are used in the construction of the combiner box?

The enclosure of the MDJB Box is made from high-quality PC/ABS plastic, which offers excellent durability and resistance to UV rays and physical impacts. This ensures a long-lasting and resilient installation, crucial for outdoor solar applications.

6. Is there any maintenance required for the MDJB?

Maintenance requirements are minimal. It is recommended to periodically check the integrity of the enclosure and the tightness of electrical connections. Regular cleaning to remove dust and debris will also help maintain optimal performance.

7. Can the MDJB PV DC Combiner Box be customized for specific project needs?

Yes, we offer customization options for the MDJB to meet specific project requirements, including variations in string configurations and additional features like DC monitoring. Our team works closely with clients to tailor solutions that fit their unique solar system requirements.

8. What support does Moreday provide for installation and troubleshooting?

Moreday provides comprehensive support for both installation and troubleshooting. This includes detailed user manuals, online technical assistance, and access to our global network of service professionals who can provide on-site support as needed.

9. How can I purchase the MDJB PV DC Combiner Box?

The MDJB can be purchased directly through our website or via one of our authorized distributors. For bulk orders or specific queries, please contact our sales team to ensure the best service and support.

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