Explore high-performance Miniature Circuit Breakers (MCB), Residual Current Circuit Breakers (RCCB), and Molded Case Circuit Breakers (MCCB) engineered for industrial reliability.
Strategic analysis of electrical protection, grid modernization, and international manufacturing standards for EPCs, OEM integrators, and industrial distributors.
The rapid shift toward solar PV, battery energy storage systems (BESS), and localized microgrids demands protection switchgear capable of managing bi-directional power flows, rapid fault isolation, and enhanced DC/AC insulation integrity.
International infrastructure projects require strict conformity to IEC/EN 61008-1, IEC/EN 60898-1, and UL 489. Modern engineering specs mandate zero-defect manufacturing, full-traceability SOPs, and verified electromagnetic compatibility (EMC).
Global procurement teams no longer seek simple component vendors; they demand manufacturing partners capable of delivering verified technical data, thermal modeling, short-circuit breaking simulations, and full-lifecycle engineering support.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. has established itself as a premier manufacturer and global supplier of low-voltage distribution switchgear, circuit protection components, and intelligent control equipment. Rooted in Yueqing, Wenzhou—the acknowledged Capital of Electrical Appliances in China—OFA operates under strict ISO9001 Quality Management standards to deliver world-class electrical solutions.
With proprietary brands such as "OFA", our product engineering covers critical infrastructure across renewable energy, smart grid distribution, industrial automation, data center power delivery, commercial real estate, and OEM equipment manufacturing. Upheld by core principles of "Professionalism, Integrity, and Pragmatic Innovation," we have earned seven consecutive years of Tax Credit Grade A rating and built long-term strategic alliances across 50+ countries.
"We enable power systems to operate safer, smarter, and greener through state-of-the-art contact materials, automated manufacturing lines, and deep engineering customization."
A comprehensive technical deep-dive into the OFGX Residual Current Operated Circuit Breakers and Miniature Circuit Breakers engineered for high-duty industrial power environments.
The OFGX Series represents a technological benchmark in low-voltage electrical protection, combining rapid residual current detection with robust overload and short-circuit interrupt mechanisms. Designed to prevent electrical fires, equipment breakdown, and direct human touch contact hazard, the OFGX platform utilizes specialized toroidal transformers and high-magnetic conductivity cores to achieve tripping sensitivity within milliseconds.
Constructed with multi-layer arc splitter plates (up to 12-grid arc chutes) that rapidly stretch and extinguish electric arcs during short-circuit faults up to 10kA breaking capacity (Icu).
Employs AgCNO2 / AgNi electrical contacts providing superior welding resistance, minimal contact resistance under high-ampere load (up to 100A), and extended mechanical endurance (>20,000 operations).
Molded with thermosetting PC/ABS shell material compliant with UL94 V-0 flame rating, delivering exceptional thermal stability, anti-aging performance, and chemical corrosion resistance.
| Parameter / Feature | OFGX 2P Series (MCB / RCCB) | OFGX 4P Series (Industrial RCCB) | OEM Customization Capability |
|---|---|---|---|
| Rated Current (In) | 1A, 6A, 10A, 16A, 25A, 32A, 40A, 50A, 63A | 63A, 80A, 100A, 125A | Custom current thresholds available |
| Number of Poles | 1P+N, 2P | 3P+N, 4P | Auxiliary switch contact integration |
| Residual Current Sensitivity (IΔn) | 30mA (Human Safety), 100mA | 300mA, 500mA (Fire Prevention) | Time-delayed (Type S) selective tripping |
| Tripping Type | Type AC, Type A (Pulsating DC) | Type A, Type B (Smooth DC & High Frequency) | Custom electronic sensing modules |
| Short-Circuit Capacity (Icn/Icu) | 6,000A / 10,000A | 10,000A | Up to 15kA breaking capability design |
| Standard Compliance | IEC/EN 61008-1, IEC 60898-1 | IEC/EN 61008-1, GB/T 16916.1 | UL 1077 / UL 489 regional alignment |
Our electrical protection gear is purpose-built for harsh operational conditions, smart building automation, and high-reliability clean energy installations worldwide.
OFGX residual current circuit breakers and DC-rated protection units ensure secure isolation between solar string inverters, battery storage banks, and grid connection points.
Type A and Type B residual current devices protect charging kiosks from smooth DC leakage fault currents, guaranteeing operator safety and equipment durability.
High-breaking MCBs and MCCBs protect mission-critical Power Distribution Units (PDUs), preventing unexpected downtime and isolating sub-circuit electrical faults.
Rugged thermal-magnetic circuit breakers integrated into PLC control cabinets, motor control centers (MCC), and automated assembly lines.
Compact modular breakers engineered for sub-distribution boards in modern office towers, shopping complexes, and residential developments.
Heavy-duty circuit breakers deployed in municipal water treatment facilities, railway signaling power systems, and outdoor street lighting distribution networks.
Beyond the OFGX Series, Wenzhou OFA Electrical Technology Co., Ltd. manufactures a full catalog of distribution switchgear components to meet diverse OEM/ODM procurement demands.
Primary isolation and protection against high-amperage overloads and short circuits (63A to 1600A). Product lines include BA88, DCM1, DCOF1, OFM1, OFBLT, OF1, and OFA-M1 Series with electronic and thermal-magnetic trip units.
Modular circuit protection for end-distribution panels (1A to 63A). Product series include OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, and OFP Series.
Intelligent main distribution frame protection for power stations and industrial facilities. Featuring the high-capacity OFW1 Intelligent Universal Circuit Breaker line with smart digital controllers and SCADA communication.
Specialized earth leakage protection units protecting against shock hazards and insulation deterioration fire risks. Includes OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, and OFPM Series.
All-in-one space-saving protection integrating residual current sensing with overload/short-circuit protection in a single module. Product series: OFC, OFKL-80A, NB1L, OFMIN, OFOM, and OFR1 Series.
High-reliability main load disconnecting switches ensuring safe physical electrical isolation for maintenance. Features OFIS-125A, OFIS-BH, and OFIS-DS Series with compact DIN-rail footprints.
Our end-to-end quality assurance system ensures every piece leaving our Yueqing facility passes 100% full-inspection SOPs.
At OFA, quality is our absolute foundation. We have implemented automated assembly lines, digital inspection stations, and rigorous raw material screening (combining pure electrolytic copper for current-carrying paths with high-grade bimetallic strips for calibrated thermal tripping).
Our full-process type testing facility verifies mechanical operation life, temperature rise limits, dielectric insulation withstand voltage, and instant magnetic trip calibration under full simulated load conditions.
Whether sourcing standard distribution switchgear or requesting custom hardware engineering, our workflow guarantees rapid delivery and transparent milestones.
Our application engineers analyze your field conditions, single-line diagrams (SLD), breaking capacity demands, and regional standards to recommend optimal component specs.
Providing CAD dimension drawings, thermal curve data sheets, and compliance certificates. Samples are dispatched promptly for client prototype testing and approval.
Upon order confirmation, automated component stamping, contact silver-plating, and assembly proceed under strict ISO9001 in-process quality control checkpoints.
Every batch undergoes thermal trip testing, magnetic instant trip validation, earth leakage sensitivity verification, and high-voltage insulation withstand checks.
Export-ready palletized packaging, ocean/air freight logistics coordination, and full engineering life-cycle support from commissioning to post-warranty advice.
Discover why system integrators, plant engineers, and panel builders trust OFA for reliable power distribution.
"As a system integrator, our company has collaborated with OFA on several industrial automation projects. Their product range is quite comprehensive, covering everything from protective relays to communication gateways, which simplifies our procurement. Product quality is consistent, reducing on-site commissioning hassles."
"We purchased OFA's intelligent power monitoring devices and MCBs to upgrade our power distribution system in our workshop. The installation was simpler than expected, and integration went smoothly. Most importantly, they have been running very stably for over a year."
"Deploying OFA's energy efficiency management system and RCCB units for several office buildings we manage was a wise decision. The system helped us gain detailed insights into electricity usage and eliminated nuisance tripping issues. Their technical team is extremely responsive."
"Our utility-scale solar PV project required reliable DC and AC circuit breakers capable of operating in harsh outdoor environments. OFA's products met our technical needs at a competitive price point, backed by clear engineering documentation and prompt remote setup support."
Comprehensive engineering and procurement answers regarding OFGX Series products, customized OEM manufacturing, standards compliance, and international order fulfillment.
Discover our extensive series of Residual Current Devices, MCCBs, and specialized MCBs engineered for industrial efficiency.
OFA Electrical