Explore our core industrial and commercial circuit breaker portfolio manufactured under rigorous ISO9001 and IEC/CE standards.
An engineering insight into modern arc-quenching technologies, OEM supply chain reliability, and high-performance circuit interruption systems.
The global power distribution landscape is undergoing a decisive paradigm shift. Strict climate policies, decarbonization goals, and the phase-out of SF6 (sulfur hexafluoride) greenhouse gas insulants have accelerated demand for vacuum circuit breakers (VCB), solid-insulated switchgear (SIS), and advanced low-voltage digital interruption architectures. Modern power grids require circuit protection components capable of handling high short-circuit duty cycles, ultra-fast dielectric recovery, and seamless integration with smart grid IoT protocols.
For global equipment manufacturers, original equipment manufacturers (OEMs), and power grid engineering procurement contractors (EPCs), selecting a trustworthy circuit breaker factory goes far beyond evaluating basic switching ratings. It requires rigorous scrutiny of contact material metallurgy, axial magnetic field (AMF) interrupter geometry, mechanical operating mechanism endurance (Class M2/C2 compliance), and end-to-end quality management systems.
Wenzhou OFA Electrical Technology Co., Ltd. stands at the forefront of this industrial transformation. Operating out of Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China—OFA combines robust local manufacturing density with proprietary engineering innovation, delivering turnkey component solutions for power distribution, renewable energy projects, automated industrial facilities, and commercial infrastructures.
Rooted in China's top electrical manufacturing cluster since 2013, Wenzhou OFA Electrical Technology Co., Ltd. delivers time-tested manufacturing reliability.
Our state-of-the-art manufacturing plant integrates automated assembly cells, digital inspection stations, and precision calibration units. From raw contact silver-alloy sourcing to final mechanical endurance testing, every phase strictly follows ISO9001 quality management procedures. This guarantees that every air circuit breaker (ACB), molded case circuit breaker (MCCB), miniature circuit breaker (MCB), and vacuum switching device leaving our facility delivers uncompromised trip accuracy and thermal stability.
We provide full-spectrum OEM and ODM customization services designed to reduce client procurement overheads. Whether you require tailored short-circuit breaking capacities (Icu up to 100kA), customized auxiliary contact configurations, specialized DC protection units for solar PV/BESS installations, or localized brand labeling, OFA’s technical R&D team provides rapid prototyping, CAD/FEA simulation, and swift type testing validation.
In-depth structural specs and functional characteristics of OFA's full protection equipment lineup.
Designed to make, carry, and break currents under normal conditions, while clearing fault currents under short-circuit and overload states. Available in thermal-magnetic and electronic trip units with frame ratings up to 800A.
Compact protection modules tailored for terminal distribution panels in commercial, residential, and industrial environments. Delivers precise magnetic tripping for immediate short-circuit protection.
High-capacity main incoming circuit breaker engineered for main distribution switchboards (MDBs) and critical facility switchgear. Features microprocessor-based controllers and Modbus RTU telemetry.
High-sensitivity earth leakage current protection devices designed to protect human life against direct/indirect shock and prevent electrical fires caused by insulation degradation.
Innovatively unifies overload, short-circuit, and ground fault leakage protection into a single DIN-rail module. Maximizes enclosure wiring density and simplifies circuit fault diagnosis.
Heavy-duty load break isolators and DC switchgear tailored for solar PV string combiners, energy storage systems (BESS), and emergency power disconnect application.
| Category | Model / Series | Rated Voltage (Ue) | Rated Current (In) | Breaking Capacity (Icu/Icn) | Standards Compliance |
|---|---|---|---|---|---|
| Molded Case (MCCB) | OFA-M1 / BA88 Series | AC 400V / 690V | 16A – 800A | 35kA – 85kA | IEC 60947-2, EN 60947-2 |
| Miniature (MCB) | OFP / OFL8 / OFIS-125A | AC 230V / 400V | 1A – 125A | 6kA – 10kA | IEC 60898-1, CE, CCC |
| Air Breaker (ACB) | OFW1 Series | AC 400V / 690V | 630A – 6300A | 85kA – 120kA | IEC 60947-2, GB/T 14048.2 |
| Earth Leakage (RCBO) | NB1L / OFR1 Series | AC 230V / 240V | 6A – 63A | 6kA – 10kA (30mA) | IEC 61009-1, EN 61009-1 |
| Solar DC Breaker | DCOF1-125/PV DC | DC 500V – 1500V | 10A – 125A | 20kA (DC) | IEC 60947-2 (PV2), CE |
From extreme renewable energy environments to critical data center uptime, OFA products are engineered for operational stability.
High DC voltage interruption capabilities engineered specifically for string inverters, central inverters, and battery rack management. Features arc-extinguishing chute design to safely interrupt high DC arc energy.
Ensures zero-unplanned-downtime selective protection. Our fast-acting ACBs and MCCBs feature integrated SCADA communication capabilities, enabling predictive trip alarm logging and power quality metrics.
Built to withstand harsh thermal fluctuations, harmonic distortions, and continuous motor startup inrush currents (Category Type D/K curves). High mechanical endurance for frequent switching cycles.
Type A and Type B residual current protection (RCCB/RCBO) engineered to detect smooth DC fault currents in electric vehicle supply equipment (EVSE), fully compliant with IEC 62955 mandates.
Ultra-compact single-module RCBOs and MCBs offering complete overload, residual current, and surge protection. Sleek aesthetic design compatible with consumer unit enclosures worldwide.
Heavy-duty circuit breakers and isolators optimized for primary sub-distribution boards, ring main units (RMUs), and regional medium-to-low voltage grid modernization projects.
Stringent standard operating procedures ensuring international market access and long-term operating safety.
All OFA electrical protection components are tested in accordance with international electrotechnical standards. Our strict quality control architecture ensures full traceability from incoming metallic/dielectric raw materials to finished circuit breaker testing.
We support system integrators, brand owners, and distributors across 100+ countries with agile supply chain solutions and comprehensive technical documentation packages.
How we collaborate with clients from initial technical consultation to high-volume manufacturing and lifecycle support.
In-depth technical consultation analyzing electrical system parameters, operating voltage, short-circuit duty, environmental conditions, and certification needs.
Our engineering team creates detailed CAD layout drawings, selects optimal trip characteristics, and simulates short-circuit arc-quenching behaviors.
Fabrication of sample units undergoing rigorous mechanical endurance testing, temperature rise validation, and short-time withstand current verification.
Automated assembly line manufacturing under 100% full-inspection SOPs. Real-time visual and electrical calibration checks at every workstation.
Secure export-grade packaging, custom customs documentation, and lifecycle after-sales support backed by engineer-led remote troubleshooting.
Pioneering advanced materials, digital connectivity, and SF6-free interruption technologies for tomorrow's grid.
R&D focused on advanced CuCr (Copper-Chromium) contact alloys produced via vacuum melting, drastically minimizing contact erosion and eliminating micro-welding during extreme short-circuit fault make/break cycles.
Integrating wireless thermal sensing, mechanical contact wear algorithms, and Modbus/IEC 61850 communication modules directly into breaker frames for real-time predictive maintenance diagnostics.
Expanding eco-friendly medium-voltage vacuum switching technology to replace SF6 gas switchgear completely, aligning with EU fluorinated greenhouse gas (F-gas) regulations and global decarbonization goals.
Hear how industry leaders, system integrators, and facility managers succeed using OFA circuit protection solutions.
"As an industrial system integrator in Poland, collaborating with OFA has greatly streamlined our switchboard manufacturing. Their MCB and MCCB series offer exceptional breaking consistency. Commissioning time was cut significantly due to their clear technical documentation and standard DIN dimensions."
"We retrofitted our factory’s main distribution panels using OFA’s intelligent power monitoring components and molded case breakers. For over two years, the system has operated faultlessly under demanding thermal conditions. Their remote support team was extremely responsive."
"Deploying OFA’s RCBO solutions across several commercial office complexes in Bangkok helped us eliminate nuisance tripping while guaranteeing earth leakage protection. The single-module design freed up valuable enclosure space."
"Our solar project in Chile demanded durable DC circuit breakers capable of operating under intense ambient UV and thermal stress. OFA’s 1000V DC miniature breaker series passed all grid interconnection tests effortlessly."
Comprehensive engineering details regarding OFA manufacturing capabilities, product specs, and OEM partnerships.
Discover our specialized molded case breakers, DC photovoltaic switchgear, and high-breaking-capacity protection solutions.
OFA Electrical
