Explore our high-performance electrical switchgear designed for global OEM/ODM manufacturing, industrial power safety, and renewable energy distribution networks.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is strategically rooted in Yueqing, Wenzhou—widely recognized as the "Capital of Electrical Appliances in China." Over more than a decade of steady development, OFA has evolved into a powerhouse of research, development, and high-precision manufacturing of low-voltage distribution switchgear and control equipment accessories.
With proprietary brands such as "OFA", our technical ecosystem covers complete circuit protection—from Miniature Circuit Breakers (MCB), Residual Current Circuit Breakers (RCCB), Residual Current Breakers with Overcurrent Protection (RCBO), to Molded Case Circuit Breakers (MCCB) and Air Circuit Breakers (ACB). Rated as a Tax Credit Grade A enterprise for 7 consecutive years, we deliver uncompromised electrical safety to over 780 international procurement partners across 50+ countries.
As global power infrastructure transitions toward renewable integration, EV charging ecosystems, and high-density computing networks, residual current protection has entered a transformative era.
Traditional Type AC RCCBs trip only on sinusoidal AC residual currents. Modern industrial automation, solar inverters, and EV chargers generate complex smooth DC fault currents and high-frequency harmonics. The modern OFID Series leads the market by integrating advanced Type B and Type A DC-residual sensing mechanisms capable of detecting smooth DC leakage currents down to 6mA, preventing core saturation in zero-sequence transformers.
Circuit breakers are evolving from passive thermal-magnetic shutoff devices into active, data-rich edge nodes. Modern low-voltage distribution architecture requires OFID residual current equipment to communicate telemetry (leakage current levels, thermal dissipation, trip histories, phase imbalances) directly to SCADA systems via Modbus-RTU, Wi-Fi, or IoT gateways.
With commercial switchboards demanding higher power density per cubic centimeter, engineering teams require multi-pole (2P and 4P) OFID units that maintain high short-circuit breaking capacity (6kA to 10kA) within ultra-compact modular enclosures without thermal de-rating.
Overseas project engineers, panel builders, and electrical distributors face complex technical, regulatory, and supply chain barriers during international sourcing.
| Procurement Pain Point | Industry Vulnerability | OFA OFID Series Solution Standard |
|---|---|---|
| Nuisance Tripping & False Alarms | Poor zero-sequence transformer sensitivity causes unprovoked tripping due to transient switching surges or capacitive line currents. | Transient Immunity & Filtering: Engineered with digital signal conditioning and surge-proof trip threshold curves (IEC/EN 61008-1 compliant). |
| DC Leakage Blind Spots | Standard RCCBs fail to detect smooth DC residual currents generated by EV chargers and solar PV inverters, blinding protective relays. | Full-Spectrum DC Detection: OFID DC-specific 2P/4P breakers incorporate dual-magnetic cores detecting both AC harmonics and pure DC leakages. |
| Supply Chain Instability | Protracted lead times from OEM factories lead to missed construction deadlines and expensive project delay penalties. | Yueqing Industrial Cluster Advantage: Automated assembly lines and streamlined raw material supply guarantee fast, reliable delivery schedules. |
| Compliance & Certification Gaps | Non-standard components lack full international type-test reports, preventing clearance by local electrical safety inspectors. | Comprehensive Global Approvals: Certified to CE, IEC 60947, IEC 61008, ISO9001 quality management, with full batch traceability. |
Our OFID series and switchgear components provide robust protection across diverse, high-demand operating environments.
End-of-line protection using compact OFDPN RCBOs and OFID 2P RCCBs. Combines overload, short-circuit, and high-sensitivity earth-leakage (30mA) protection into single-module units, guarding occupants against fatal electrical shocks and fire hazards caused by damaged insulation.
Graded residual protection using OFA OFM1 Series Molded Case Circuit Breakers (MCCB) and OFID 4P high-capacity units. Provides full selectivity and discrimination across multi-tier main distribution boards (MDB) and sub-distribution panels (SDB).
Specifically developed DC MCCBs and OFID 4P DC Residual Current Circuit Breakers designed to sustain high DC voltages up to 1000V/1500V. Safeguards solar combiner boxes and battery energy storage systems (BESS) against ground faults and arcing risks.
Custom Type B OFID residual current equipment engineered to withstand heavy pulsating DC components associated with onboard EV chargers, satisfying strict IEC 62423 safety directives for public and commercial EV fast-charging piles.
Low-noise, surge-immune OFIS and OFPF series miniature breakers providing uninterruptible operational continuity for server racks, UPS systems, and cooling infrastructure against transient harmonic disturbances.
Heavy-duty OFW1 Intelligent Universal Air Circuit Breakers (ACB) and MCCB units built for motor protection, heavy inductive loads, and harsh industrial environments with vibration-resistant mechanical linkages.
Explore the engineering behind OFA’s flagship low-voltage circuit protection devices.
Primary Function: Makes, carries, and automatically breaks electrical currents under normal conditions and abnormal fault conditions such as overloads and severe short circuits.
Primary Function: Serves as the fundamental guardian at the final sub-distribution level of modern low-voltage electrical systems.
Primary Function: Dedicated residual current protection solution designed to prevent electric shock and fire caused by insulation fault leakage.
Primary Function: Innovatively integrates three core functions—overload, short-circuit, and high-sensitivity earth-leakage protection—into a single compact chassis.
Primary Function: High-performance core power distribution breaker designed for low-voltage main transformer incoming feeders and large sub-stations.
Primary Function: Combines complete circuit isolating safety with robust switching capability under heavy load conditions.
Take an insider look at our modern production lines, automated testing rigs, and rigorous quality inspection centers.
At Wenzhou OFA Electrical Technology Co., Ltd., quality is our absolute bottom line. We adhere to rigorous 100% full-inspection Standard Operating Procedures (SOPs) across every manufacturing stage—from incoming raw contact inspection to magnetic coil calibration and final automated tripping tests.
How OFA is shaping the next decade of intelligent low-voltage power networks through continuous R&D innovation.
Moving from "passive tripping after a fault" to "active prediction." Next-gen OFID series breakers will incorporate micro-processors capable of analyzing micro-leakage trendlines, alerting facility maintenance managers to insulation degradation before a breaker trip causes operational downtime.
Fusing semiconductor micro-second switching speeds with traditional mechanical isolation. OFA R&D teams are prototyping hybrid solid-state residual units that clear short-circuit faults in micro-seconds, virtually eliminating destructive electric arcing.
Pioneering green manufacturing with 100% recyclable engineering polymers and halogen-free arc-chute materials, ensuring that every OFID product reduces lifetime carbon footprint in align with global Net-Zero directives.
We streamline OEM/ODM product customization and high-volume procurement through a clear, engineering-led execution model.
Read why system integrators, plant engineers, and panel builders worldwide rely on OFA electrical solutions.
"As an industrial system integrator in Poland, our team partnered with OFA for power distribution upgrades across automotive assembly lines. The OFID 4P series and MCCBs provided consistent tripping reliability and simplified panel layout work immensely."
"We deployed OFA intelligent monitoring devices and RCBO units to overhaul electrical panels at our workshop. The setup was intuitive, and the equipment has operated continuously for over a year without a single false trip."
"Managing commercial power systems demands fast engineering responses and zero failure rates. OFA’s custom ODM service matched our exact enclosure dimensions while keeping procurement costs well within budget."
Complete your power distribution architecture with our trusted lineup of miniature breakers, RCBOs, and isolation switches.
Get authoritative technical and procurement answers directly from OFA's engineering team.
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