Explore our flagship OEM/ODM miniature circuit breakers and protection devices manufactured under stringent ISO9001 and IEC/CE compliance standards.
Wenzhou OFA Electrical Technology Co., Ltd. redefines low-voltage distribution with high breaking capacity, thermomagnetic precision, and zero-defect modular switchgear.
At the critical terminal of modern electrical distribution architectures—spanning high-density commercial complexes, heavy industrial automated plants, renewable solar farms, and data centers—uncompromising circuit safety is paramount. The OFIS-BH Series Miniature Circuit Breakers (MCB) and Isolating Switches (IS) represent the pinnacle of engineering innovation from Wenzhou OFA Electrical Technology Co., Ltd. Located in Yueqing, Wenzhou—the world-renowned Capital of Electrical Appliances in China—OFA has established itself as an authoritative OEM/ODM manufacturer specializing in high-performance distribution switchgear and control gear.
The OFIS-BH Series is specifically designed to handle severe thermal and electromagnetic stress during peak operational loads and fault events. Featuring advanced arc-extinguishing chute geometry, high-purity silver-alloy contacts, and ultra-durable flame-retardant housing (UL94-V0 rated thermo-hardened polymers), the OFIS-BH line delivers instantaneous tripping accuracy under overcurrent and short-circuit conditions ($I_{cu}$ up to 10kA according to IEC/EN 60898-1 and IEC/EN 60947-2 standards).
Technical Information Gain Note: The OFIS-BH series incorporates a dual-bimetallic thermal overload calibration process. Unlike standard market MCBs that suffer from thermal derating drift in high-ambient environments (+50°C), OFA’s proprietary ambient-temperature compensation housing design guarantees consistent nominal trip characteristics across fluctuating operational climates.
| Parameter Standard | OFIS-BH 1P Single Pole | OFIS-BH 2P Double Pole | OFIS-BH 3P Three Pole | OFIS-BH 4P Four Pole |
|---|---|---|---|---|
| Rated Operational Voltage ($U_e$) | AC 230/240V | AC 230/400V | AC 400/415V | AC 400/415V |
| Rated Current Range ($I_n$) | 1A, 6A, 10A, 16A, 25A, 32A, 63A | 6A - 63A / 80A - 125A | 6A - 63A / 80A - 125A | 6A - 63A / 80A - 125A |
| Short-Circuit Capacity ($I_{cu}$) | 6,000A / 10,000A | 6,000A / 10,000A | 6,000A / 10,000A | 6,000A / 10,000A |
| Tripping Characteristics | B, C, D Curves | B, C, D Curves | B, C, D Curves | B, C, D Curves |
| Rated Impulse Withstand ($U_{imp}$) | 6 kV | 6 kV | 6 kV | 6 kV |
| Mechanical & Electrical Life | 20,000 / 10,000 Cycles | 20,000 / 10,000 Cycles | 20,000 / 10,000 Cycles | 20,000 / 10,000 Cycles |
| Enclosure Protection Degree | IP20 (IP40 in enclosure) | IP20 (IP40 in enclosure) | IP20 (IP40 in enclosure) | IP20 (IP40 in enclosure) |
Leading the digital transformation of electrical protection through smart IoT telemetry, green material science, and solid-state hybrid switching.
The next iteration of the OFIS-BH Series integrates miniaturized RS-485 Modbus-RTU, NB-IoT, and Wi-Fi communication gateway modules directly into the DIN-rail footprint. This enables continuous telemetry of real-time current, temperature, phase angle, and voltage metrics directly to enterprise SCADA platforms, transforming passive tripping into predictive fault diagnostics.
OFA’s advanced R&D division in Yueqing is pioneering semiconductor-assisted hybrid breaking mechanisms. By placing silicon-controlled rectifiers (SCR) in parallel with physical mechanical contacts, future OFIS-BH variants will achieve microsecond-level arc quenching (< 1ms), dramatically suppressing arc flash hazards and prolonging contact lifespan up to 100,000 switching operations.
Committed to global ESG objectives, OFA is transitioning the OFIS-BH line to 100% lead-free, cadmium-free silver-tin-oxide ($AgSnO_2$) contact matrices and halogen-free recyclable thermoplastic housing components. Our eco-design roadmap strictly adheres to EU RoHS 3.0 and REACH mandates while lowering lifecycle carbon footprints by 35%.
Tailored protection architectures engineered to meet harsh operational demands across diverse sectors.
In distributed photovoltaic installations and battery storage containers, continuous DC/AC switching induces severe harmonic distortion and transient thermal loads. The OFIS-BH isolator switch and high-breaking MCBs provide secure separation of inverter arrays, preventing reverse current damage and DC arc flash hazards up to DC 1000V/1500V requirements.
Automated manufacturing lines require electrical components that withstand heavy mechanical vibration, electromagnetic interference (EMI), and frequent motor startup current surges. OFIS-BH 3P/4P breakers featuring Type D magnetic tripping characteristics seamlessly absorb high inrush currents without nuisance tripping.
Critical IT infrastructure demands zero power interruption. Integrated with OFA's NB1L and OFR1 Series RCBO devices, the OFIS-BH series delivers selective cascade protection, isolating localized ground faults instantly without triggering upstream main panel switchgear disconnects.
Electric Vehicle Supply Equipment (EVSE) demands compact, highly reliable isolation devices resistant to weather fluctuations. The OFIS-BH line delivers DIN-rail mountable IP20 touch-safe protection suited for outdoor AC chargers and DC fast-charging power cabinets.
How Wenzhou OFA Electrical Technology Co., Ltd. combines lean production, automation, and geographic cluster advantages to deliver unmatched quality at scale.
Founded in 2013 in Yueqing, Wenzhou—the heartland of China's low-voltage electrical apparatus cluster—Wenzhou OFA Electrical Technology Co., Ltd. leverages an integrated supply ecosystem. Operating under strict ISO9001 Quality Management System certification, OFA operates automated stamping, precision riveting, and digital trip calibration stations.
Unlike trading intermediaries, OFA maintains 100% full-process quality control. Every single OFIS-BH unit undergoes automated standard operating procedure (SOP) inspection prior to dispatch—verifying magnetic instant trip thresholds, bimetal thermal curve accuracy, dielectric voltage withstand, and mechanical operating torque.
Strategic criteria for international B2B buyers, panel builders, and OEM brand owners selecting low-voltage circuit protection suppliers.
International procurement teams require absolute verification of CE, CB, and IEC 60898-1 / 60947-2 compliance. OFA provides complete type test reports, certified declaration of conformity, and full raw material traceability certificates for frictionless custom clearances worldwide.
Global brands need customized laser marking, specific tripping curve tuning, custom pole configurations, and private label packaging. OFA's experienced engineering team executes non-standard requests quickly without introducing manufacturing defect risks.
Direct sourcing from OFA's Yueqing manufacturing hub eliminates middleman markups, reducing unit acquisition costs by 20% to 35% while maintaining electrical performance parity with premium European tier-1 brands.
Empowering system integrators and EPC contractors in over 100 countries with localized documentation and technical support.
Navigating varying regional electrical grid standards—such as European 230/400V 50Hz systems, North American split-phase grids, or South American high-humidity tropical installations—demands localized technical flexibility. Wenzhou OFA Electrical Technology Co., Ltd. provides localized engineering support tailored to regional requirements:
Fully compliant with EN 60898-1 and EN 60947 standards, featuring standard 35mm DIN-rail clipping, comb busbar compatibility, and terminal protection shrouds meeting IP20 touch-safe requirements under VDE guidelines.
Reinforced anti-corrosion plating on all metallic conductors and bimetallic trips, preventing premature oxidation under elevated humidity and ambient temperatures up to +60°C.
Instant access to BIM 3D models, CAD dimensional schematics, selectivity coordination curves, and step-by-step installation manuals for rapid engineering approval cycles.
See why electrical engineers, plant operators, and system integrators worldwide specify OFA components.
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