Explore our flagship OEM & ODM circuit protection hardware built to strict IEC, CE, and ISO global standards.
Wenzhou OFA Electrical Technology Co., Ltd. is one of the premier suppliers of distribution switchgear and control equipment in China. Founded in 2013, the company is rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China.
It owns independent proprietary brands such as "OFA", delivering products across multiple industries including power generation, renewable energy systems, industrial automation, commercial construction, and heavy equipment manufacturing.
Rooted in Yueqing for over a decade, Wenzhou OFA Electrical Technology Co., Ltd. provides global partners with distribution switchgear, control equipment, and low-voltage protective devices that combine rock-solid stability with competitive cost advantages.
We adhere strictly to honest, law-abiding operations, having been rated as tax credit grade A for seven consecutive years, earning the long-term trust of clients in over 100 countries. Our factory operates under ISO9001 quality management system certification, guaranteeing zero-defect output for critical low-voltage infrastructure.
Addressing modern electrical challenges: Why RCBO technology is superseding traditional MCB + RCCB dual-module configurations.
Modern distribution panels demand maximum protective functionality per DIN-rail unit space. Traditional installations require a separate Miniature Circuit Breaker (MCB) for overcurrent defense alongside a Residual Current Circuit Breaker (RCCB) for earth leakage protection. Advanced 1P+N compact RCBOs integrate both thermal-magnetic trip units and zero-sequence current transformers into a single 18mm module, reducing board footprint by up to 50%.
In legacy switchboards, a single upstream RCCB protects multiple MCB-fed outgoing circuits. An earth fault on one branch trips the primary RCCB, blacking out all associated sub-circuits. Implementing dedicated RCBOs on each branch guarantees localized tripping—only the faulty circuit is isolated, preserving power to critical loads like medical equipment, data servers, and cold storage units.
With the massive expansion of non-linear loads—such as variable frequency drives (VFDs), EV chargers, and solar inverters—standard Type AC earth-leakage devices are rendered blind by smooth DC components. Leading China RCBO manufacturers like OFA engineered Type A, Type F, and Type B RCBO solutions to detect high-frequency AC and pulsating DC residual currents accurately.
| Electrical Protection Parameter | Standalone MCB | Standalone RCCB | Combined RCBO (OFA Engineering) |
|---|---|---|---|
| Overload Protection (Thermal) | Yes (Bimetallic Strip) | No | Yes (Calibrated Bimetal) |
| Short-Circuit Protection (Magnetic) | Yes (Solenoid Core) | No | Yes (High-Speed Solenoid) |
| Earth Leakage Protection | No | Yes (Toroidal CT) | Yes (Precision Zero-Sequence CT) |
| Fault Isolation Granularity | Low (Upstream dependent) | Group Level | Individual Branch Isolation |
| DIN Rail Footprint | 1 Module (18mm) | 2-4 Modules (36-72mm) | 1 Module to 2 Modules (18-36mm) |
| IEC/EN Standard Compliance | IEC/EN 60898-1 | IEC/EN 61008-1 | IEC/EN 61009-1 |
Engineered for harsh environmental conditions, demanding load dynamics, and complex international regulatory frameworks.
Solar sub-combiners and microinverters operate under thermal stress and high DC bias conditions. OFA’s dedicated DCOF1 and OFMIN Type A/B RCBOs provide flawless protection against residual ground fault leakage containing DC components, preventing fire hazards in photovoltaic roof installations.
Electric Vehicle Supply Equipment (EVSE) demands high sensitivity to smooth DC leakage currents (>6mA). Installing OFA Type A + 6mA DC or Type B RCBO protection inside wallboxes ensures total compliance with IEC 62955, safeguarding electric vehicle owners from dangerous touch voltages.
High inductive loads and transient voltage spikes cause frequent nuisance tripping on standard breakers. OFA’s OFAP6-AC and OFMIN series feature high surge immunity (8/20µs transient current withstand up to 3kA), ensuring unbroken continuous operation for robotic manufacturing lines.
Located in Yueqing, Wenzhou—the epicenter of China's electrical appliance manufacturing ecosystem—OFA leverages immediate proximity to world-class raw material suppliers, precision stamping facilities, and specialized molding plants. This localized cluster efficiency translates directly into:
OFA has implemented digital inspection stations and automated calibration lines across its workshop. Every single RCBO manufactured undergoes rigorous, multi-stage testing including:
Pioneering the evolution from passive mechanical tripping to IoT-connected, predictive electrical asset management.
OFA's next-generation smart RCBO architecture embeds microcontrollers alongside RS485 Modbus, WiFi, or Zigbee communication modules. Real-time telemetry data—including voltage RMS, current leakage, temperature, and power factor—is continuously streamed to edge gateways or cloud platforms (SCADA/EMS).
Future protection modules will combine RCBO capabilities with Arc Fault Detection Devices (AFDD). By utilizing digital signal processing (DSP) to analyze high-frequency current signatures, these intelligent devices detect dangerous micro-arcing before electrical fires ignite.
OFA’s R&D division is actively testing micro-hybrid and solid-state circuit breaker (SSCB) topologies. By utilizing wide-bandgap semiconductors (SiC/GaN), solid-state tripping occurs within microseconds—over 1,000 times faster than mechanical contacts—virtually eliminating arcing wear.
Integrated solutions tailored for system integrators, panel builders, EPC contractors, and global distributors.
Primary function: make, carry, and break currents under normal and abnormal conditions (overloads, short circuits up to 100kA). Critical defense for main distribution boards.
End-of-line protection for residential and commercial distribution. Compact footprint with high breaking capacities (6kA/10kA) across 1P, 2P, 3P, and 4P configurations.
High-current protection (up to 6300A) for power plant incoming switchgear. Deep intelligence, flexible expandability, and selective protection coordination.
Specialized high-reliability earth leakage detection. Graded residual current protection (10mA to 300mA) preventing fatal electric shocks and ground fire risks.
Innovatively combines overload, short-circuit, and high-sensitivity earth leakage defense into a single unified DIN module. Full-scenario protection for modern panels.
Innovatively integrates circuit isolating features into standard modular enclosures for safe maintenance isolation in industrial and commercial switchboards.
Seamless execution tailored for standard energy-saving projects or complex enterprise OEM custom integrations.
Core Needs: Proven solutions, rapid delivery, clear ROI, easy maintenance.
Core Needs: High-reliability redundancy, custom enclosure branding, non-standard electrical curves.
Discover why system integrators, facility directors, and solar EPCs rely on OFA for mission-critical power protection.
"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 and integration work. The product quality is consistent, reducing on-site commissioning hassles."
"We purchased OFA's intelligent power monitoring devices to upgrade the power distribution system in our workshop. The installation and setup were simpler than expected, and integration went smoothly. Most importantly, they have been running stably for over a year, and the electricity data provided helped us identify energy anomalies."
"Deploying OFA's energy efficiency management system for several office buildings we manage was a wise decision. The system helped us gain detailed insights into electricity usage in different areas and achieve energy savings through optimized operational strategies. Their online support team is highly responsive."
"Our solar PV project required reliable communication management and data acquisition equipment. OFA's products met our core needs at a reasonable price and adapted seamlessly to our harsh local outdoor environment. Their technical engineers provided stellar configuration guidance via video call."
Detailed technical, quality control, OEM, and global logistics answers from OFA engineering specialists.
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