Leading MCB Manufacturer | MOREDAY - 20+ Years Excellence
MOREDAY is a professional MCB manufacturer with over 20 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 80+ countries with high-quality, IEC/CE/RoHS certified circuit protection solutions.
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MOREDAY MCB Product Lineup - Complete Technical Specifications
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
MDB1Z-63 Miniature Circuit Breaker
- Poles: 1P, 2P, 3P, 4P
- Rated Current: 1A-63A (18 ratings)
- Breaking Capacity: 6000A (In ≤ 6A to 40A), 4500A (In 50A, 63A) Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Rated Voltage: 1P: 240/415V~, 2P/3P/4P: 415V~
- Curve Code: B, C, D
- Mechanical Durability: 10,000 cycles
- Electrical Durability: 4,000 cycles
- Protection Degree: IP20/IP40
Why Choose MOREDAY?
MOREDAY is a professional 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, IEC/CE/RoHS certified circuit protection solutions.
- Industry-Leading Quality: Every MCB undergoes rigorous testing to ensure consistent performance and safety
- Innovative Design: Our R&D team continuously improves our products to meet evolving industry standards
- Comprehensive Support: From selection guidance to after-sales service, we're with you at every step
- Global Compliance: All MOREDAY MCBs meet international safety standards, including IEC, RoHS, CE, and more
- Competitive Pricing: Premium quality without the premium price tag
Precision Engineering - Inside MOREDAY MCB Technology
At MOREDAY, we believe that true quality is revealed in the details. Our MCB manufacturing philosophy centers on “Sublime Micro-Engineering Narratives” – where every component, from the smallest spring to the largest contact assembly, represents surgical precision and artistic interpretation of technical excellence.
- Fire-Retardant Casing: The shell is made of PA66 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.
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How to Select the Right MCB for Your Application
Proper MCB selection requires considering multiple factors. Use this comprehensive guide to specify the correct circuit breaker for your installation.
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MCB Trip Curve Comparison: B vs C vs D Explained
Understanding trip curve characteristics is essential for proper MCB selection. The curve type determines when the magnetic element provides instantaneous protection against short circuits.
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MCB Manufacturing Process - From Raw Materials to Certified Products
Our Production Workflow As a vertically integrated MCB manufacturer, we control every stage:
1. Raw Material Inspection
- Imported silver alloy contacts
- High-purity electrolytic copper terminals
- PA66 flame-retardant housing (UL94 V0)
- Bimetallic strips from certified suppliers
2. Automated Assembly
- Robotic contact assembly (±0.01mm precision)
- Arc chamber installation & testing
- Thermal & magnetic element calibration
- Final assembly in Class 10,000 cleanroom
3. 100% Quality Testing
- Automatic electrical testing station
- Temperature rise measurement
- Dielectric strength testing
- Mechanical operation testing (20+ cycles)
4. Certification & Packaging
- Batch traceability labeling
- IEC/CE compliance documentation
- Anti-static packaging
- Custom branding (OEM orders)
Applications
Electrical Solutions for Every Need
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.
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MCB Factory Image
Discover Our Best-Selling Electrical Equipment – High Efficiency, Reliable Performance, and Trusted by Electrical Equipment Suppliers Worldwide.
More Than Just a MCB 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 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 MCB
- What is an MCB?
A miniature circuit breaker (MCB) is an automatically operated electrical switch designed to protect circuits from overcurrent damage caused by overloads or short circuits. Unlike fuses that must be replaced after operating, MCBs can be reset and reused indefinitely. They work through two protection mechanisms: a thermal element (bimetallic strip) that provides time-delayed protection against overloads, and a magnetic element (solenoid) that provides instantaneous protection against short circuits, typically operating in 0.01-0.1 seconds.
- How Does an MCB Work?
Modern MCBs from our manufacturing facility employ two protection mechanisms:
1. Thermal Protection (Overload)
- Bimetallic strip heats and bends under prolonged overcurrent
- Provides time-delayed tripping for overload conditions
- Allows temporary harmless overcurrents (motor starting)
- Typically trips at 1.13-1.45x rated current within 1 hour
2. Magnetic Protection (Short Circuit)
- Electromagnetic solenoid activates under sudden high current
- Provides instantaneous tripping for fault conditions
- Operates in milliseconds (0.01-0.1 seconds)
- Prevents arc flash and equipment damage
- Key Components of an MCB
- Operating Mechanism: The handle and latching mechanism
- Contacts: The conducting parts that connect and disconnect the circuit
- Arc Extinguishing Chamber: Quenches the arc formed during contact separation
- Thermal Element: Bimetallic strip for overload protection
- Magnetic Element: Solenoid for short-circuit protection
- Terminals: Connection points for incoming and outgoing cables
- What is the difference between B, C, and D trip curves?
B-curve MCBs trip at 3-5 times the rated current and are ideal for resistive loads like lighting and heating. C-curve MCBs trip at 5-10 times the rated current, making them suitable for general-purpose applications including slightly inductive loads like small motors—this is the most commonly used curve representing about 90% of installations. D-curve MCBs trip at 10-20 times the rated current and are designed for highly inductive loads with high inrush currents such as large motors, transformers, and welding equipment.
- How do I determine the correct MCB size for my application?
Calculate the maximum current draw of your circuit, then select an MCB with a rating slightly higher than this value. Consider factors like cable size, load type, and potential future expansion. For specific guidance, consult our selection guide or contact our technical team.
Get Your MCB Quote Today
We provide samples for free, you just need to tell us what you need