Explore our high-performance Residual Current Operated Circuit Breakers (RCCBs), Miniature Circuit Breakers (MCBs), and Molded Case Circuit Breakers (MCCBs) manufactured under strict IEC/EN international standards.
High-Quality OFDX 2P High-Performance Residual Current Operated Circuit Breaker (RCCB)
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China OFDX 4P High-Performance Four-Pole Residual Current Operated Circuit Breaker (RCCB)
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China OFDX 4P High-Performance Four-Pole Residual Current Operated Circuit Breaker (RCCB) Supplier
View Product DetailsIn modern low-voltage electrical distribution networks, ensuring high-level personnel safety, equipment protection, and fire prevention against insulation degradation is paramount. The OFDX Series Residual Current Operated Circuit Breakers (RCCB) manufactured by Wenzhou OFA Electrical Technology Co., Ltd. represent an advanced paradigm shift in current-operated safety devices. Engineered specifically to monitor zero-sequence differential current, the OFDX Series provides real-time detection of minute leakage currents, isolating hazardous faults before catastrophic electrical shocks or electrical fires occur.
The heart of the OFDX RCCB is a high-permeability nano-crystalline toroidal core. It vectors the vector sum of live and neutral currents with microscopic precision, detecting imbalances as low as 10mA to 300mA instantly.
Equipped with advanced surge filtering networks, the OFDX Series resists impulse voltage spikes (8/20µs wave profiles up to 4000A) caused by indirect lightning strikes or switching surges, drastically reducing false trips.
Designed with standard 35mm DIN-rail mounting dimensions, featuring dual-stable locking clips, flame-retardant VO-grade polycarbonate housing, and bi-directional busbar wiring options for compact panel boards.
| Electrical Parameter | OFDX 2P (Single Phase) Specification | OFDX 4P (Three Phase) Specification |
|---|---|---|
| Rated Operational Current (In) | 16A, 25A, 32A, 40A, 63A, 80A, 100A | 16A, 25A, 32A, 40A, 63A, 80A, 100A |
| Poles Configuration | 1P + N / 2P | 3P + N / 4P |
| Rated Residual Operating Current (IΔn) | 10mA, 30mA, 100mA, 300mA, 500mA | 30mA, 100mA, 300mA, 500mA |
| Residual Current Type | Type AC (AC residual), Type A (Pulsating DC), Type B (Smooth DC) | Type AC, Type A, Type B (Specialized industrial) |
| Short-Circuit Conditional Rating (Inc) | 10,000A (10kA) with backup fuse | 10,000A (10kA) with backup fuse |
| Tripping Time (IΔn) | ≤ 0.1s (Instantaneous), Selective Type S (0.13s - 0.5s) | ≤ 0.1s (Instantaneous), Selective Type S (0.13s - 0.5s) |
| Mechanical & Electrical Life | 20,000 Mechanical / 10,000 Electrical Operations | 20,000 Mechanical / 10,000 Electrical Operations |
| Degree of Protection / Standards | IP20 (IP40 in enclosure) / IEC 61008-1, EN 61008-1, CE | IP20 (IP40 in enclosure) / IEC 61008-1, EN 61008-1, CE |
Founded in 2013 in Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China—Wenzhou OFA Electrical Technology Co., Ltd. has established itself as an authoritative supplier and manufacturer of low-voltage distribution switchgear, control equipment, and protective devices. Rated as a Tax Credit Grade A Enterprise for seven consecutive years, OFA combines deep engineering heritage with modern digital quality control systems.
Our dedicated R&D team continuously refines switchgear mechanisms. Equipped with full-process type testing laboratories, we perform rigorous internal verifications including dielectric strength, temperature rise testing at maximum load, mechanical operation endurance, and residual tripping characteristic analysis before mass batch production.
By implementing automated calibration equipment and digital inspection stations along our Yueqing assembly lines, every single OFDX RCCB undergoes 100% full-inspection Standard Operating Procedures (SOPs). We verify tripping response threshold, contact resistance, and arc-chute seating to guarantee zero out-of-factory defects.
The versatility of the OFDX Series RCCB makes it an essential safety component across diverse industrial, commercial, and energy sectors around the globe. Its engineering adaptability ensures seamless integration into multi-tier protection schemes.
EV Charging Stations (EVSE) generate smooth DC residual leakage currents during AC-to-DC conversion. Installing OFDX Type A / Type B RCCBs prevents blind saturation of the transformer core, ensuring total safety for public and private EV chargers.
Photovoltaic arrays and battery storage systems operate under fluctuating DC voltages. OFDX breakers protect inverter output circuits from earth insulation breakdown caused by environmental moisture, thermal expansion, or cable degradation.
Factories utilizing Variable Speed Drives (VSDs) and CNC robotics introduce non-sinusoidal high-frequency leakage currents. The OFDX Type B series delivers precise, frequency-compensated trip curves without non-fault tripping interruption.
Uninterruptible Power Supplies (UPS) and server racks demand continuous power availability combined with ground fault protection. OFDX selective (Type S) units enable graded protection downstream without dropping main switchboard feeds.
From smart home main distribution panels to HVAC distribution boxes, OFDX 2P and 4P RCCBs safeguard human life against direct contact electrocution (30mA threshold) and structural electrical fires (300mA threshold).
Temporary power panels on construction sites face mechanical stress and water exposure. The rugged housing and wide operating temperature range (-25°C to +55°C) of OFDX RCCBs maintain consistent tripping accuracy everywhere.
Partnering with Wenzhou OFA Electrical Technology Co., Ltd. connects global B2B buyers directly to the world's most sophisticated electrical manufacturing ecosystem. Located in Yueqing, Wenzhou, our facility leverages structural supply chain efficiencies that translate into superior product value, rapid production turnaround, and custom OEM scalability.
Being embedded in the heart of China’s low-voltage cluster gives OFA immediate physical access to high-purity copper terminal suppliers, silver-alloy contact manufacturers, micro-molding specialists, and calibration labs within a 10-kilometer radius. This geographic concentration eliminates raw material supply bottlenecks and reduces component transit times to zero.
Our lean manufacturing architecture integrates high-speed stamping presses, automated contact welding units, and computerized calibration stations. This high degree of automation allows us to offer market-leading pricing structures while upholding uncompromising precision and meeting large-scale project timelines reliably.
The global low-voltage circuit breaker market is undergoing rapid expansion, driven by global electrification, renewable energy adoption, stringency in national safety codes, and the rise of smart building energy management systems. OFDX Series RCCBs are manufactured strictly in accordance with international safety specifications to ensure universal export compatibility.
Compliance with EN 61008-1 and CE mark directives is mandatory across EU countries. European wiring regulations (such as BS 7671 in the UK) mandate Type A or Type B RCCBs for all circuits supplying socket outlets, EV chargers, and solar equipment—specifications fully matched by OFDX.
Rapid industrialization in markets like Brazil, Mexico, Vietnam, and Indonesia requires durable electrical protection capable of handling grid voltage fluctuations and high humidity. OFDX RCCBs feature tropicalized internal coatings to prevent corrosion.
High ambient thermal resistance is essential in desert regions like the GCC. The OFDX Series undergoes elevated ambient temperature calibration (+55°C) to prevent thermal degradation and guarantee accurate tripping under extreme heat.
As power systems transition from traditional electromechanical protection toward connected, data-driven microgrids, OFA Electrical Technology is actively expanding its R&D horizon. Our technology roadmap outlines the evolution of the OFDX Series toward intelligent, smart-grid integrated protection devices.
Future iterations of the OFDX platform incorporate integrated RS485 Modbus and wireless IoT communications. This enables real-time monitoring of residual current leakage amplitude, line temperature, and operating cycle counts, pushing diagnostics directly to cloud SCADA platforms.
By blending traditional zero-sequence magnetic core technology with digital signal processing (DSP), OFA engineers are developing hybrid residual current devices capable of distinguishing between harmless switching transients and hazardous high-frequency arc faults before catastrophic failures occur.
At Wenzhou OFA Electrical Technology Co., Ltd., we recognize that global partners require tailored technical solutions. Our engineering department provides comprehensive OEM and ODM support to match your specific regional requirements, private branding needs, and project specifications.
Need non-standard trip sensitivities, customized delay timing curve profiles for selective Type S breaker coordination, or unique short-circuit breaking capacity ratings? Our R&D team adjusts internal coil turns and calibration jigs to meet your exact specifications.
We deliver complete private-label manufacturing, including customized color-coded toggle switches, laser-engraved brand logos, bespoke packaging designs, and multi-language technical instruction manuals for seamless retail or EPC distribution.
From initial design consultations, 3D CAD modeling, and rapid sample prototyping to factory acceptance testing (FAT), shipping logistics, and post-installation troubleshooting guidance, OFA engineers accompany your technical team every step of the way.
Find authoritative answers to common engineering, selection, and purchasing questions regarding OFDX Series RCCBs and OFA Electrical manufacturing services.
Discover OFA Electrical’s full array of circuit breaker solutions, covering residential miniature circuit breakers, heavy-duty molded case breakers, and advanced earth leakage units.
High-Quality OFGX 4P100A High-Performance Four-Pole Residual Current Operated Circuit Breaker
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High-Quality OFDX 2P High-Performance Residual Current Operated Circuit Breaker (RCCB)
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OFA Electrical
