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MDB7-100 is applied in a PV system; it can close automatically, the quality is excellent, and it can maintain the power transmission mode for a long time.

  • 6kA high-performance segmentation capability
  • Automatic reclosing function
  • Din Rail installation
  • Small and intelligent
  • Allow over and under voltage function
  • Excellent material

Stable Delvery Time

Technical Support

2 Years

MDB7 Miniature Automatic Reclosing Circuit Breakers

MDB7 Miniature Automatic Reclosing Circuit Breakers

The MDB7 Miniature Automatic PV Reclosing Circuit Breaker represents a significant advancement in power management technology, designed to ensure continuous and reliable power distribution. With state-of-the-art features and robust performance, these circuit breakers are tailored to meet the stringent demands of modern electrical systems, particularly in critical infrastructure and high-dependency environments.

Key Features and Advantages

MDB7 Miniature Automatic pv reclosing circuit breaker Enhanced Safety

PV Reclosing Circuit Breaker Enhanced Safety

With a rated short-circuit breaking capacity of Ics=Icn=6000A, MDB7 ensures robust protection against electrical faults.

Longevity and Reliability

Engineered for durability with a mechanical life of 10,000 operations and an electrical life of 6,000 operations.

MDB7 Miniature Automatic Reclosing Circuit Breakers Longevity and Reliability
MDB7 Miniature Automatic Reclosing Circuit Breakers Flexible Control

Flexible Control

Features like remote split/close control and automatic reclosing make MDB7 pv reclosing circuit breaker adaptable to diverse settings, enhancing operational efficiency.

Smart Integration

Equipped with feedback signals and control indicators for real-time status updates, facilitating better energy management.

MDB7 Miniature Automatic Reclosing Circuit Breakers Smart Integration
MDB7 Miniature Automatic Reclosing Circuit Breakers User-Friendly Interface

User-Friendly Interface

Control level voltage tailored at 220V AC±30%, with a minimal control level current of Ic≤1mA, ensuring easy integration into existing setups.

Applicable Scenarios

Residential Buildings

Safeguarding home electrical systems from overload and short circuits.

Commercial Complexes

Ensuring uninterrupted power supply and protection in high-demand environments.

Industrial Setups

Offering robust fault protection in machinery and heavy-duty electrical applications.

Why Choose Moreday?

Certified Quality

All products are backed by top-tier certifications, including TUV, CE, and CB, ensuring they meet global standards.

Factory Direct

As a direct manufacturer, Moreday guarantees product authenticity, top-notch quality, and competitive pricing.

Global Reach:

With a strong presence in markets like Mexico, Poland, and North America, our global footprint attests to our reliability and service excellence.




Number of poles



Short circuit protection,overload protection,isolated, remote split/close control

Rack rated current value lnm


Rack rated current value lnm

230V AC(2P)/400V AC(4P)

Rated current ln

32A, 40A, 50A, 63A,80A,100A

Instantaneous trip type


Rated short-circuit breaking capacity


Mechanical life


Electrical life


Overcurrent tripping characteristics


Degree of protection

See Table 1 and Figure 1

Closing time


Power-on delay


Control level voltage


Control level current


Closing module power take-off mode

Take power before thecontrol line meter, take power after closing/opening the short time table

Split/close switch

Phase line power

Phase leakage current


Control signal indicator


Feedback signal


Split/close operation mode

Built-in shaft drive

popular questions


1. What is an automatic reclosing circuit breaker?

An automatic reclosing circuit breaker, like our MDB7, is designed to automatically close after it has opened in response to a fault. This functionality helps to maintain service continuity and reliability in electrical systems, minimizing downtime.

2. Can the MDB7 be used in both residential and commercial settings?

Absolutely! The MDB7 is versatile enough to be used in residential, commercial, and industrial settings. Its robust design and configurable settings make it ideal for a wide range of applications, from home safety to managing power in large-scale commercial buildings.

3. What certifications do MDB7 circuit breakers hold?

Our MDB7 circuit breakers are certified with CQC, CE, and CB standards, ensuring they meet the highest quality and safety requirements recognized internationally.

4. How does the MDB7 enhance safety in electrical systems?

The MDB7 enhances electrical safety by providing short circuit and overload protection, remote control capabilities for safer operation, and automatic reclosing to quickly restore power after disruptions.

5. What are the maintenance requirements for the MDB7?

The MDB7 is designed for low maintenance. However, regular checks and routine tests are recommended to ensure optimal performance. The mechanical and electrical life ratings provide a guideline for the operational longevity of the circuit breaker.

6. How does the MDPV-30 enhance the safety of solar PV systems?

By integrating features like double-break contacts and a robust enclosure rated IP20, the MDPV-30 enhances overall system safety by providing reliable protection against short circuits and overloads, while also preventing direct contact with live parts.

7. Can the MDB7 be integrated with other smart home or building systems?

Yes, the MDB7 can be integrated with smart home and building management systems. It features a RS485 serial interface for communication networking, allowing it to be controlled and monitored remotely through advanced system setups.

8. Is there a warranty on the MDB7 circuit breakers?

Yes, Moreday provides a warranty for the MDB7 circuit breakers, covering any manufacturing defects and ensuring support for a specified period post-purchase. Please contact our customer service for detailed warranty terms.

9. Are there different models of the MDB7 available for different current ratings?

Yes, the MDB7 is available in multiple models to accommodate various current ratings, ensuring suitability for different load requirements. Options include ratings from 32A up to 100A.

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