High-Quality Micro Circuit Breaker Factories & Supplier

Next-Generation Low-Voltage Electrical Distribution, Modular Circuit Protection, and OEM/ODM Precision Manufacturing Solutions

Featured Micro & Molded Case Circuit Breakers

Explore our high-performance industrial and commercial circuit protection solutions, built to international IEC/EN safety benchmarks.

OEM OFD4Z7 Miniature Circuit Breaker: Industrial-Grade Overcurrent Protection

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China OFKL 4P Miniature Circuit Breaker High-Capacity Suppliers

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OEM OFL7 Series 3P Miniature Circuit Breaker Industrial Grade

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OEM OFAP6-AC High-Performance Waterproof Residual Current Circuit Breaker

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China OFM1/63A Molded Case Circuit Breaker (MCCB) Factory Direct

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China OFA-M1 Series 630 A Molded Case Circuit Breaker

China OFA-M1 Series 630 A Heavy Duty Molded Case Circuit Breaker

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China DCOF1-125PV DC Miniature Circuit Breaker

China DCOF1-125/PV Solar Photovoltaic DC Miniature Circuit Breaker

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OEM OFNC Series 3P Miniature Circuit Breaker

OEM OFNC Series 3P Compact Miniature Circuit Breaker Factory

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Professional Supplier from Yueqing — The Electrical Capital

Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is a specialized technology enterprise rooted in Yueqing, Wenzhou — China's premier low-voltage electrical manufacturing hub. Operating under our proprietary brand "OFA", we engineer and manufacture advanced distribution switchgear, control equipment, and modular circuit protection devices.

Upholding a strict philosophy of "Professionalism, Integrity, and Pragmatic Innovation," OFA has maintained a Tax Credit Grade A rating for seven consecutive years. Our modern manufacturing center integrates fully automated assembly lines, digital inspection stations, and comprehensive full-process type testing devices. This ensures every Micro Circuit Breaker (MCB) meets rigorous mechanical endurance, insulation, and thermal rise parameters prior to factory dispatch.

ISO9001:2015 Certified Quality Management System
100% Automated SOP Inspection and Zero-Defect Tolerance
Full Compliance with International IEC/EN 60898-1 & IEC 60947-2 Standards
End-to-End OEM/ODM Customization for Global Enterprise Brands

Wenzhou OFA Electrical Factory Production Line

13+

Years of Industry Expertise

96+

Skilled Technicians & Staff

780+

Global EPC & OEM Partners

100+

Countries Served Worldwide

Global Micro Circuit Breaker Industry Development Trends

As modern power grids transition toward decentralized renewable energy, smart cities, and heavy industrial automation, the role of the Miniature Circuit Breaker (MCB) has evolved from passive fault clearance to intelligent energy management.

1. IoT Integration & Smart Tripping

Modern commercial infrastructure demands real-time diagnostic capability. Next-generation MCBs incorporate micro-sensors and wireless telemetry (RS485 Modbus, Wi-Fi, Zigbee) to monitor line temperature, leakage currents, and load trends, facilitating predictive maintenance before catastrophic trips occur.

2. High DC Voltage Circuit Protection

With the exponential growth of Photovoltaic (PV) solar installations, Battery Energy Storage Systems (BESS), and EV charging networks, the demand for specialized DC MCBs operating up to 1000V/1500V DC with non-polarized arc extinguishing chambers has skyrocketed.

3. Eco-Friendly Sustainable Materials

Leading global buyers prioritize eco-conscious manufacturers. Premium MCB factories are adopting recyclable halogen-free thermoplastics (RoHS/REACH compliant) and lead-free contact rivets to reduce environmental impact across the product lifecycle.

Technical Engineering Specifications & Tripping Characteristics

Matching the correct Miniature Circuit Breaker parameters to specific load profiles is critical for cascading protection, avoiding nuisance trips, and ensuring operational reliability.

Technical Note: OFA Micro Circuit Breakers utilize high-purity silver-graphite alloy contacts paired with multi-plate arc chutes to extinguish high-energy short circuits within milliseconds (trip response < 2.5ms), preserving wiring integrity.

Series Parameter	OF6KA / OFP Series	OF10KA / C65 Series	DCOF1-125/PV Series	OFA-M1 MCCB Series
Rated Current (In)	1A, 6A, 10A, 16A, 25A, 32A, 40A, 63A	1A - 63A Modular	6A, 10A, 16A, 32A, 63A, 125A	16A to 630A Adjustable
Rated Voltage (Ue)	230V / 400V AC (50/60Hz)	240V / 415V AC	12V DC - 1000V DC / 1500V DC	400V / 690V AC
Ultimate Breaking Capacity (Icu)	6,000A (6kA)	10,000A (10kA)	10kA / 20kA (DC)	35kA - 65kA
Tripping Curve Profile	B Curve (3-5In), C Curve (5-10In)	B, C, D Curve (10-14In)	DC Specific Instantaneous Trip	Electronic / Thermal-Magnetic
Mechanical / Electrical Life	20,000 Operations / 10,000 Ops	20,000 Operations / 10,000 Ops	15,000 Operations / 8,000 Ops	15,000 Operations / 6,000 Ops
Standard Compliance	IEC/EN 60898-1, CE, RoHS	IEC/EN 60947-2, CE, CB	IEC 60947-2, EN 60947-2	GB/T 14048.2, IEC 60947-2

OFA Manufacturer Warehouse and Quality Inspection

Global Enterprise Procurement Needs & Supply Chain Security

B2B importers, electrical distributors, and switchboard panel builders demand absolute stability, rapid lead times, and OEM customization. Wenzhou OFA Electrical offers a streamlined procurement pipeline designed to mitigate international supply chain risks.

Custom OEM/ODM Branding: Laser marking, private label casing, customized color handles, and specialized outer packaging.
Flexible Batch Production: High-capacity automated production lines engineered to fulfill high-volume urgent orders without quality degradation.
Full Factory Traceability: Individual batch serial numbering, complete type testing documentation, and raw material mill certificates.
Secure International Shipping: Export-ready heavy-duty reinforced cartons and fumigated palletization for safe sea/air transit.

Multi-Category Low-Voltage Circuit Protection Matrix

Beyond standard MCBs, OFA manufactures systemic power control hardware engineered for full-spectrum system integration.

Molded Case Circuit Breaker (MCCB)

Protects main feeder lines up to 630A. Models like the BA88, DCM1, DCOF1, and OFM1 Series offer high breaking capacities and adjustable thermal-magnetic or electronic trip units.

Residual Current Operated Breakers (RCCB / RCBO)

Provides critical life-safety defense against earth leakage and shock. Includes OFAP6-AC, OFDX, OFGX, OFC, and NB1L Series featuring combined overcurrent and ground fault protection.

Isolator Switches (IS Series)

Combines isolation and load-break switches (OFIS-125A, OFIS-BH, OFIS-DS) for safe maintenance segmenting in industrial power panels and PV combiner boxes.

Macro Industry Solutions Across Global Sectors

Our circuit distribution components are deployed across vital infrastructure projects worldwide, engineered to perform under extreme ambient conditions.

Solar PV & Storage Systems

High-voltage DC breaker solutions tailored for string inverters, battery rack enclosures, and grid-tied combiner boxes. Rated for up to 1500V DC operating parameters.

Smart Commercial Buildings

High-density sub-panel breakers with low power loss (wattage dissipation) to reduce thermal buildup inside commercial distribution boards, compliance certified for high-rise occupancy.

Industrial Automation & OEM Equipment

Supplying robust short-circuit defense for sensitive PLC units, variable frequency drives (VFDs), and motor control centers (MCC) requiring precise D-Curve tripping.

Technology Roadmap & Future Outlook (2026–2030)

Strategic R&D direction focusing on next-generation power electronics and intelligent fault prevention.

Solid-State Circuit Breakers (SSCB)

Development of semiconductor-based tripping mechanisms offering ultra-fast microsecond interruption times, completely eliminating mechanical contact wear and arc flash risks.

AI Edge Diagnostics

Integration of micro-AI algorithms embedded directly inside smart breaker controllers to analyze waveform anomalies and differentiate harmless inrush currents from dangerous arcing events.

Compact Modular Optimization

Continuous reduction of physical footprints (1P+N in 18mm module width) while simultaneously boosting heat dissipation performance and short-circuit interrupt capacity (up to 15kA).

Frequently Asked Questions (FAQ)

Clear answers to key technical, sourcing, and OEM inquiries for procurement professionals.

Q: What is the core difference between Type B, Type C, and Type D MCB trip curves?

Type B curves trip instantaneously between 3 to 5 times rated current (In), suitable for purely resistive loads like electric heating or domestic lighting. Type C curves trip between 5 to 10 times In, making them the standard choice for general commercial loads and small motors. Type D curves trip between 10 to 14 times In, designed specifically for high inrush inductive loads such as industrial transformers, heavy motors, and X-ray machinery.

Q: How does OFA ensure quality consistency across high-volume OEM orders?

Wenzhou OFA Electrical operates under ISO9001 certified Quality Management SOPs. Every production lot undergoes 100% automated inspection for calibration accuracy, instantaneous magnetic trip response, temperature rise verification, and dielectric withstand tests. We maintain complete factory traceability for all shipped products.

Q: Can standard AC Miniature Circuit Breakers be used in DC Solar PV applications?

No. Standard AC MCBs rely on the natural zero-crossing point of alternating current to extinguish the electrical arc. Direct current (DC) maintains a continuous arc that can burn through standard AC contacts. Specialized DC breakers, such as our DCOF1-125/PV series, incorporate internal permanent magnets to push the DC arc into the arc chute, guaranteeing safe interruption.

Q: What international certifications do OFA circuit breakers carry for global export?

Our products hold international certifications including CE, CB, and RoHS compliance, tested in alignment with IEC/EN 60898-1 and IEC 60947-2 standards. We provide full compliance documentation for seamless import customs clearance across Europe, Southeast Asia, South America, and the Middle East.

Q: What custom OEM options are available for industrial distributors and brand owners?

We provide comprehensive OEM customization including custom laser logo printing on the breaker housing, handle color customization (blue, red, yellow, green), custom technical ratings, bespoke instruction manuals, and private-brand outer box packaging.