AC MCCB MDM1 400V 690V

MOREDAY ac mccb breaker MDM1 400 volt 690 volt, the leader of AC molded case products, is fully upgraded.


  • Distribute power and protect circuits
  • Overload, short circuit, undervoltage
  • Small size, easy installation
  • High breaking capacity and short arc
  • According to IEC60947-2
  • RoHS material


An AC MCCB is a type of circuit breaker designed to protect electrical circuits from overcurrents, short circuits, and other electrical faults. It is designed to handle ac (alternating current) electrical systems, which are commonly used in residential, commercial, and industrial applications. MCCBs are typically used for higher current ratings compared to their smaller counterparts, miniature circuit breakers (MCBs).


Enhanced Protection
Ac MCCBs offer enhanced protection against electrical faults, such as overloads and short circuits. They can handle higher current ratings compared to MCBs, making them suitable for a wide range of applications. Moreover, electronic AC MCCBs can provide advanced protection features, ensuring the safety and reliability of the electrical system.

AC MCCBs are highly customizable, allowing users to adjust their trip settings according to the specific requirements of their electrical system. This flexibility helps optimize the overall performance and protection level of the system.

Ac MCCBs are more compact than traditional air circuit breakers, making them a space-saving solution for electrical panels. Their modular design enables easy installation and replacement, reducing the need for additional equipment or extensive panel redesigns.

AC MCCB MDM1 400V 690V Product Advantage
MDM1 AC Molded Case Circuit Breaker 125A 250A


Residential Buildings: They protect electrical circuits in homes, ensuring the safety of occupants and preventing electrical fires.                             Commercial Facilities: Offices, retail stores, and other commercial establishments use AC MCCBs to safeguard their electrical systems and prevent downtime due to electrical faults.                                  
Industrial Plants: AC MCCBs provide critical protection for heavy machinery, motors, and other high-power electrical equipment in factories and manufacturing plants.    
Data Centers: In these facilities, AC MCCBs help prevent electrical faults that can lead to costly downtime and data loss.
Renewable Energy Systems: AC MCCBs play a vital role in protecting solar, wind, and other renewable energy installations from electrical faults.


Electronic AC MCCBs use digital or microprocessor-based sensing and trip units. These advanced systems provide more accurate and adjustable protection than thermal-magnetic breakers. They can also offer additional features, such as ground fault protection, adjustable trip settings, and real-time monitoring of electrical parameters.

Selection Guide


MDM1 AC Molded Case Circuit Breaker Product Dimensions


Model MDM1
Rated current(A)
125,140,160,180, 200,225,250,320,400, 500,630
Rated voltage Ue(V)
Rated insulation voltage Ui(V)
0perat ion life (cycle)
ON:500-1000 OFF:2500-9000
Automatictripping Device
Thermo – electromagnetic
Degree of protection


Choose Your Most Suitable Product

Common Queries

Frequently Asked Questions

You'll find answers about our products. If your question is not answered below,
please feel free to contact us. 

A: An AC MCCB is designed for higher current ratings and provides more advanced protection features compared to an MCB. They are typically used in applications where larger loads and more robust protection are required.

A: No, AC MCCBs are specifically designed for alternating current (AC) systems. Using an AC MCCB in a DC application may result in inadequate protection and device failure.

A: To select the appropriate AC MCCB, consider factors such as the required current rating, breaking capacity, type of load, and any specific protection features needed for your electrical system.

A: Regular inspection and maintenance are crucial for ensuring the proper functioning and longevity of AC MCCBs. It’s recommended to inspect them at least once a year, although the frequency may vary depending on the specific application and environmental conditions. Maintenance tasks include checking for signs of wear, corrosion, or damage, as well as cleaning and lubricating moving parts.

A: While some AC MCCBs may have similar specifications, it’s essential to consult the manufacturer’s guidelines before attempting to interchange them. Using an incompatible breaker can lead to inadequate protection, reduced performance, or even damage to the electrical system.

A: Common causes of AC-MCCB failure include mechanical wear, contact erosion, incorrect installation, and environmental factors, such as excessive heat, moisture, or dust. Regular inspection, maintenance, and adherence to manufacturer guidelines can help prevent these issues and ensure reliable operation.

A: To determine if your AC MCCB is functioning properly, you can perform a visual inspection, check for any unusual noises or signs of wear, and test its trip functionality. Some electronic ac mccbs also have diagnostic features that allow for real-time monitoring of electrical parameters and breaker status.

A: If your AC MCCB is tripping frequently, it may indicate an underlying issue with your electrical system, such as an overloaded circuit, short circuit, or ground fault. It’s essential to consult a qualified electrician to diagnose and resolve the problem to prevent damage to your system or electrical components.

A: When working with AC MCCBs, always follow the manufacturer’s guidelines and adhere to relevant safety regulations. Ensure the power is turned off before performing any maintenance or inspection tasks. Use appropriate personal protective equipment (PPE), such as insulated gloves and safety glasses, to reduce the risk of injury. If you’re unsure about any aspect of working with AC MCCBs, consult a qualified electrician for assistance.

A: Upgrading from a thermal-magnetic AC MCCB to an electronic one may be possible, but it depends on the specific models and compatibility. Consult the manufacturer or a qualified electrician to determine if an upgrade is feasible and appropriate for your electrical system.

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