High-performance Circuit Breakers and Protection Devices Engineered for Critical Infrastructure & Global OEM Automation
Driving the continuous progress of power distribution and industrial control technology! Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China. We specialize in the complete R&D, advanced manufacturing, and global supply of low-voltage distribution switchgear, industrial control equipment, and specialized protection components.
We are committed to enabling global power systems to operate safer, smarter, and with superior energy efficiency. Through robust independent engineering, rigid quality management, and tailored OEM/ODM capabilities, our independent brand "OFA" serves critical applications across renewable power generation, energy storage, industrial automation, data centers, and heavy infrastructure.
OFA's modern manufacturing facility in Yueqing, combining lean automated assembly with rigorous type-testing laboratories.
Deep Analysis of Yueqing Electrical Cluster & Technological Manufacturing Economics
Located in Yueqing, Wenzhou, OFA benefits from the world's most dense supply chain ecosystem for low-voltage electrical components. Within a 10-kilometer radius, high-precision silver contact stamping, arc-extinguishing chamber synthesis, flame-retardant polymer molding, and automated calibration labs operate synchronously. This drastically reduces bill-of-materials (BOM) lead times and logistical overhead.
OFA's digital workshops feature automated assembly lines, robotic testing stations, and digital laser marking systems. Real-time in-process monitoring guarantees consistent contact resistance, ultra-precise thermal magnetic trip curve responses, and flawless mechanical endurance exceeding international IEC standards by up to 30%.
By coupling vertical component integration with lean raw material procurement, OFA delivers industrial-grade circuit protection equipment at highly competitive pricing. Global engineering clients optimize their Total Cost of Ownership (TCO) without compromising on safety, dielectric isolation, or short-circuit breaking performance.
Explore OFA's Core Low-Voltage Switchgear, Circuit Breakers & Protection Equipment
OFA's MCCB product line is designed to make, carry, and break currents under normal circuit conditions, providing robust protection against overloads and severe short-circuit faults in heavy commercial and industrial systems up to 1600A.
At the end of modern low-voltage distribution systems, OFA MCBs safeguard circuits with space-saving compact housing, fast contact breaking speed (< 10ms), and breaking capacities spanning 6kA to 10kA (IEC 60898-1 certified).
Designed as the core intelligent master protection unit for low-voltage power distribution main incoming lines (up to 6300A), featuring digital communication protocols (Modbus-RTU, Profibus) and selective trip unit intelligence.
Integrating 3-in-1 trip mechanisms: overload, short-circuit, and high-sensitivity earth leakage current protection (10mA, 30mA, 100mA, 300mA Type A/AC/B), preventing personnel electrical shock and electrical fire hazards.
Bridging International Standards with Tailored Regional Customization
Global buyers demand zero operational risk. OFA products comply strictly with IEC/EN 60947-2 (for industrial switchgear) and IEC/EN 60898-1 (for residential/commercial installations). Holding full CE, CCC, and ISO9001 certifications, every batch undergoes 100% full-inspection SOPs verifying dielectric impulse withstand (Uimp), thermal trip accuracy, and mechanical switching cycles.
Electrical environments vary greatly worldwide — from 50Hz/60Hz frequency shifts to high-humidity tropical microclimates and extreme temperature swings (-25°C to +70°C). OFA engineers offer localized customization: special tropicalized anti-fungal coatings, custom trip curves (B, C, D, K, Z), dynamic voltage calibrations, and private-label OEM packaging for global system integrators.
| Product Category | Rated Current (In) | Breaking Capacity (Icu) | Standards Compliance | Primary Industrial Application Scenario |
|---|---|---|---|---|
| MCCB (Molded Case) | 16A – 1600A | 25kA – 100kA (415V) | IEC 60947-2, GB/T 14048.2 | Main Industrial Switchboards, Heavy Machinery Protection |
| MCB (Miniature) | 1A – 125A | 6kA – 10kA (230/400V) | IEC 60898-1, CE | Distribution Boards, Control Panels, Commercial HVAC |
| ACB (Air Circuit Breaker) | 630A – 6300A | 85kA – 120kA (415V) | IEC 60947-2, Modbus SCADA | Transformer Low-Voltage Side, Substation Main Breakers |
| DC Solar Breakers | 63A – 250A (Up to 1500V DC) | 20kA – 50kA DC | IEC 60947-2 (PV) | Solar Photovoltaic Arrays, Battery Energy Storage (BESS) |
| RCBO / RCCB | 6A – 100A (10-300mA) | 6kA – 10kA | IEC 61009-1, IEC 61008-1 | Human Safety Protection, EV Charging Stations, Cleanrooms |
Engineered for Demanding Operating Environments Across Modern Industry
High DC voltage breakers (DCOF1-250/PV, DCOF1-125/PV) capable of extinguishing high-energy DC arcs up to 1500V DC, protecting solar combiner boxes, central inverters, and lithium battery banks.
Precision motor protection MCCBs and IS Isolator switches safeguarding automated assembly lines, PLC cabinets, CNC machinery, and variable frequency drives (VFD) against phase loss and overcurrent.
Type A and Type B Residual Current Breakers (RCBO/RCCB) designed to detect smooth DC earth leakage currents in fast DC chargers and AC wallboxes, guaranteeing operator safety.
High breaking capacity (10kA+) MCBs and intelligent ACBs providing uninterruptible power distribution (PDU) protection with low contact resistance and zero false tripping under harmonic loads.
Aesthetic, ultra-compact DIN-rail circuit breakers and RCCBs matching standard consumer units for hotels, residential complexes, and modern office towers.
Heavy-duty switchgear and air circuit breakers deployed in municipal water treatment plants, rail transit stations, and regional power grid distribution substations.
See Why Global System Integrators & Engineering Leaders Rely on OFA
"As a system integrator in Poland, our company has collaborated with OFA on several industrial automation projects. Their product range is exceptionally comprehensive — covering everything from protective relays to molded case breakers. Quality is rock-solid, eliminating on-site commissioning delays."
"We deployed OFA's DC circuit breakers (DCOF1 series) across our 15MW solar power plant in Chile. Equipment stability under extreme high-altitude UV and thermal conditions has been continuous. Remote engineering support during configuration was top tier."
Expert Answers Regarding Procurement, Technical Specifications, Customization & Delivery
Complete Your System Architecture with OFA's Certified Breaker Series
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