Molded Case Circuit Breaker Manufacturer | Industrial MCCB Supplier
High breaking capacity molded case circuit breakers designed for main distribution panels, industrial systems, solar plants, and energy storage applications. MOREDAY is a professional MCCB manufacturer with over 17 years of experience in designing, producing, and exporting miniature circuit breakers.
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MOREDAY MCCB Product Lineup - Complete Technical Specifications
Complete MCCB Solutions from 63A to 1250A, Covering 400V AC to 1500V DC Applications
MDM1Z Series | ||||
|---|---|---|---|---|
Model |
Rated Voltage |
Poles |
Current Range |
Contact Type |
MDM1Z-125 |
600V DC |
2P |
Up to 125A |
Composite Silver |
MDM1Z-125 |
1000V DC |
4P |
Up to 125A |
Silver |
MDM1Z-250 |
600V DC |
2P |
Up to 250A |
Composite Silver |
MDM1Z-250 |
1000V DC |
4P |
Up to 250A |
Silver |
MDM1Z-400 |
1000V DC |
4P |
Up to 400A |
Silver |
MDM1Z-400 |
1500V DC |
4P |
Up to 400A |
Silver |
MDM6Z Series | ||||
|---|---|---|---|---|
Model |
Rated Voltage |
Poles |
Current Range | |
MDM6Z-250 |
1000V DC |
2P |
63A–250A | |
MDM6Z-250 |
1500V DC |
3P |
63A–250A | |
MDM6Z-320 |
1000V DC |
2P |
280A–320A | |
MDM6Z-320 |
1500V DC |
3P |
250A–320A | |
MDM6Z-400 |
1500V DC |
2P |
250A–400A | |
MDM6Z-400 |
1500V DC |
2P |
250A–400A | |
MDM6Z-500 |
1500V DC |
4P |
250A–400A | |
MDM6Z-500 |
1500V DC |
2P |
450A–500A | |
MDM6Z-630 |
1500V DC |
2P |
630A | |
MDM6Z-800 |
1500V DC |
2P |
700A–800A | |
MDM6Z-500H Series | ||||
|---|---|---|---|---|
Model |
Rated Voltage |
Poles |
Current Range | |
MDM6Z-500H |
1500V DC |
2P |
50A–320A | |
MDM6Z-500H |
1500V DC |
2P |
400A | |
MDM6Z-500H |
1500V DC |
2P |
500A | |
MDM1 Series | ||||
|---|---|---|---|---|
Model |
Rated Voltage |
Poles |
Current Range |
Contact Type |
MDM1-63 |
400V |
3P/4P |
63A |
Alloy / Composite Silver |
MDM1-125 |
220V/380V/400V |
2P/3P/4P |
125A |
Alloy / Composite Silver |
MDM1-250 |
380V/400V |
2P/3P/4P |
250A |
Alloy / Composite Silver |
MDM1-400 |
400V |
3P/4P |
400A |
Composite Silver |
MDM1-630 |
400V |
3P/4P |
630A |
Composite Silver |
MDM1-800 |
400V |
3P/4P |
800A |
Composite Silver |
MDM1-1000 |
480V |
3P |
1000A |
Silver |
MDM1-1250 |
480V |
3P |
1250A |
Silver |
MDM6 Series | ||||
|---|---|---|---|---|
Model |
Current Range |
Poles |
Breaking Capacity | |
250H |
63A–200A |
3P |
Icu=Ics=20kA | |
320H |
225A–320A |
3P |
Icu=Ics=20kA | |
250R |
63A–320A |
3P |
Icu=50kA / Ics=36.5kA | |
400H |
400A |
3P |
Icu=Ics=50kA | |
630H |
500A–630A |
3P |
Icu=Ics=50kA | |
800H |
800A |
3P |
Icu=Ics=50kA | |
MDM6RT Series | ||||
|---|---|---|---|---|
Model |
Current Range |
Poles |
Icu / Ics | |
160H |
40A–160A |
3P/4P |
50kA / 36kA | |
250H |
100A–250A |
3P/4P |
50kA / 36kA | |
320H |
280A–320A |
3P/4P |
50kA / 36kA | |
400H |
250A–400A |
3P/4P |
75kA / 50kA | |
630H |
500A–630A |
3P/4P |
75kA / 50kA | |
800H |
630A–800A |
3P/4P |
65kA / 36kA | |
1250H |
1000A–1250A |
3P/4P |
65kA / 36kA | |
Accessory | Applicable Frame |
|---|---|
Shunt Trip |
125–250 / 400 / 630 |
Auxiliary Contact (Single) |
125–250 / 400 / 630 |
Auxiliary Contact (Double) |
125–250 / 400 / 630 |
Alarm Contact |
125–250 / 400 / 630 |
Auxiliary + Alarm Contact |
125–250 / 400 / 630 |
Manual Operating Mechanism |
3P 250 / 400 / 630 |
Motorized Operating Mechanism (CD/2) |
3P 250 / 400 / 630 |
Why Choose MOREDAY MCCB?
MOREDAY is a professional MCCB manufacturer with over 17 years of experience in designing, producing, and exporting miniature circuit breakers. Located in Yueqing – China’s “Electric Device Metropolis” – we serve distributors, contractors, and electrical engineers across 30+ countries with high-quality, CE / CB / TÜV certified circuit protection solutions.
- Fire-Retardant Casing: The shell is made of PA6 nylon material, offering V0-grade flame retardancy and high impact resistance.
- Silver Alloy Contacts: We use premium silver-graphite contacts to ensure low contact resistance and prevent welding during short circuits.
- Arc Extinguishing Chamber: An optimized 13-plate grid design rapidly cools and extinguishes arcs, extending the electrical life of the breaker.
- Visual Indicator: Clear Red/Green window indicates contact position for safe maintenance.
Precision Engineering - Inside MOREDAY MCCB Technology
At MOREDAY, we believe that true quality is revealed in the details. Our MCCB manufacturing philosophy centers on “Sublime Micro-Engineering Narratives” – From the smallest armature to the largest trip unit assembly, every component embodies solid materials and an artistic interpretation of superior technology.
- High Breaking Capacity: Up to 25kA / 35kA / 50kA for industrial short circuit protection.
- Adjustable Thermal & Magnetic Protection: Precise overload and short-circuit setting for system coordination.
- Compact Modular Design: Easy installation in distribution cabinets.
- Certified for International Projects: CE / CB / TÜV compliant.
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How to Select the Right MCCB for Your Application
Proper MCCB selection requires considering multiple factors. Use this comprehensive guide to specify the correct circuit breaker for your installation.
Selection Factor | What to Consider | MOREDAY Recommendation |
|---|---|---|
Rated Current (In) |
Should match load current with 20% safety margin. |
Recommended Range: 63A–800A |
Breaking Capacity (Icu) |
Must exceed prospective short circuit current. |
Residential small distribution: 25kA Industrial panels: 35kA–50kA |
Trip Unit Type |
Thermal-Magnetic – Standard industrial use |
Electronic – Precision adjustable protection |
Adjustable Settings |
Overload adjustment range |
Instantaneous short-circuit setting |
Number of Poles |
3P – Standard three-phase |
4P – Three-phase + Neutral protection |
Application Type |
Main incomer breaker Sub-distribution breaker Generator protection Solar plant main AC breaker Energy storage system output protection | |
Understanding trip curve characteristics is essential for proper MCCB selection. The curve type determines when the magnetic element provides instantaneous protection against short circuits.
Feature | MCB | MCCB |
|---|---|---|
Current Range |
Up to 125A |
63A–800A+ |
Breaking Capacity |
6kA–15kA |
25kA–50kA+ |
Adjustability |
Fixed |
Adjustable |
Application |
Final circuits |
Main distribution |
Industrial Use |
Limited |
Primary protection |
Applications
Typical Applications of MCCB
As a trusted electrical equipment manufacturer, MOREDAY delivers high-performance electrical solutions designed for residential, commercial, industrial, and renewable energy applications—providing cost savings, operational efficiency, and reliability across diverse industries worldwide.
Industrial Distribution Panels
MCCB in industrial switchboards can protect the power supply of all downstream branches.
Solar Power Plants
The solar energy industry relies on MCCB to protect the safety of upstream and downstream circuits.
Energy Storage Systems
Each energy storage system is equipped with a MCCB for AC side protection of the battery inverter.
Generator Systems
Overload & short-circuit main breaker.
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More Than Just a MCCB Manufacturer
At MOREDAY, we go beyond manufacturing MCBby offering a suite of value-added services tailored to meet your project needs. Our commitment to excellence ensures that every customer receives personalized attention, expert guidance, and seamless support throughout their journey with us.
Technical Consultation
Our engineering team provides professional DC protection design support for solar PV systems. From breaker selection to full combiner box configuration, we help you ensure safety, compliance, and long-term reliability.
OEM & Custom Solutions
We support logo printing, customized voltage ratings, special tripping curves, and private label packaging. MOREDAY helps distributors and project contractors build competitive branded products for local markets.
Certified Quality Assurance
Our MCB products comply with CE, CB, and TÜV standards. Each unit undergoes strict testing for breaking capacity, temperature rise, and durability to meet international project requirements.
Global Project Experience
MOREDAY products are widely used in solar power plants, energy storage systems, EV charging stations, and industrial applications across Europe, Asia, and Africa.
Knowledge About MCCB
- How to Select the Right MCCB for Your Power Distribution System？
Choosing the correct molded case circuit breaker requires evaluating current rating, short-circuit capacity, and system application to ensure reliable protection.
| Selection Factor | What to Consider | Recommendation |
|---|---|---|
| Rated Current (In) | Should exceed load current with safety margin | Choose 20–25% above load |
| Breaking Capacity (Icu) | Must exceed maximum short-circuit current | 25kA–75kA for industrial systems |
| Trip Unit Type | Thermal-magnetic or electronic protection | Electronic for precision protection |
| Number of Poles | Based on system configuration | 3P or 4P for three-phase systems |
| Adjustable Protection | Needed for motors and generators | Adjustable MCCB recommended |
- Understanding MCCB Breaking Capacity (Icu & Ics)
Breaking capacity determines the maximum short-circuit current a breaker can safely interrupt without damage.
| Term | Meaning |
|---|---|
| Icu | Ultimate breaking capacity |
| Ics | Service breaking capacity |
| Icw | Short-time withstand current |
- Where Are MCCBs Commonly Used?
Industrial Distribution Panels
- Protect main incoming power supply.
Solar Power Plants
- AC side protection of inverters.
Energy Storage Systems
- Main protection for battery inverter output.
Generator Systems
- Overload and short circuit protection.
Commercial Buildings
- Main distribution boards.
- Are MCCBs used in solar power systems?
Yes. MCCBs are commonly installed on the AC output side of solar inverters and main distribution panels.
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We provide samples for free, you just need to tell us what you need