Precision-engineered miniature circuit breakers, RCBOs, and isolation equipment verified for global industrial and commercial infrastructure.
Wenzhou OFA Electrical Technology Co., Ltd. is one of the premier professional suppliers of distribution switchgear and control equipment in China. Founded in 2013, the company is deeply rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China. Operating under proprietary registered brands such as "OFA", our product matrix spans high-reliability low-voltage electrical protection, solar PV combiners, industrial automation control, and heavy commercial power systems.
Rooted in Yueqing for over a decade, OFA has consistently provided global partners with low-voltage distribution components boasting ultra-stable electrical endurance, superior breaking capacity, and cost-effective modular designs. Operating with uncompromised integrity, OFA has earned the Tax Credit Grade A rating for seven consecutive years, consolidating long-term trust across European, Latin American, Southeast Asian, and Middle Eastern markets.
Our dedicated engineering team maintains deep domain expertise in type-testing, arc quenching dynamics, bimetallic thermal calibration, and automated assembly line optimization. Certified under ISO9001 quality management systems, OFA executes strict SOPs to minimize out-of-factory defect rates to near zero.
We enable modern power networks to operate safer and smarter by combining rigorous testing procedures, customized production, and full lifecycle technical assistance.
Understanding the macroeconomic drivers and technical specifications requested by global EPC contractors, panel builders, and OEM distributors.
The rapid global expansion of solar PV, distributed energy storage systems (BESS), and electric vehicle charging infrastructure requires circuit breakers capable of operating under continuous thermal load, DC/AC isolation dynamics, and rapid surge suppression.
Industrial buyers demand strict compliance with IEC/EN 60898-1 and IEC/EN 60947-2 standards. The OFEU Series is engineered to instantly interrupt prospective fault currents up to 10,000A, preventing catastrophic busbar welding and fires.
International buyers require flexible brand labeling, customized tripping thresholds (Curve B, C, D), specific pole configurations (1P, 2P, 3P, 4P, 1P+N), and localized regulatory certifications (CE, CB, ROHS, UL) for frictionless market entry.
An authoritative whitepaper breakdown of internal thermal-magnetic tripping mechanisms, materials science, and electrical characteristics.
| Technical Parameter | OFEU Series Standard Specification | OFDL Series Comparison | OFKL-NXB Series Comparison |
|---|---|---|---|
| Rated Current ($I_n$) | 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | 6A to 63A | 1A to 80A |
| Poles Configuration | 1P, 2P, 3P, 4P, 1P+N, 3P+N | 1P, 2P, 3P, 4P | 1P, 2P, 3P, 4P |
| Rated Voltage ($U_e$) | AC 230V/240V (1P, 1P+N), AC 400V/415V (2P-4P) | AC 230V/400V | AC 230V/400V |
| Ultimate Short-Circuit Capacity ($I_{cn}$) | 6,000A / 10,000A (IEC 60898-1) | 6,000A | 6,000A / 10,000A |
| Tripping Characteristics | B Curve (3-5 $I_n$), C Curve (5-10 $I_n$), D Curve (10-14 $I_n$) | B Curve, C Curve | B Curve, C Curve, D Curve |
| Electrical & Mechanical Endurance | Electrical: 10,000 Operations | Mechanical: 20,000 Operations | 8,000 / 15,000 Operations | 10,000 / 20,000 Operations |
| Arc Quenching Chamber | 12-Plate De-ion Grid Chamber with Rapid Cooling Vent | 10-Plate Arc Chute | 12-Plate Arc Chute |
| Terminal Connection | Tunnel Terminal for Cable up to 25$mm^2$ (Busbar compatible) | Up to 25$mm^2$ | Up to 35$mm^2$ |
| Housing Material | High-density Thermoplastic PA66 (Flame-Retardant, UL94 V-0) | Standard Thermoplastic | PA66 Thermoplastic |
Engineered to deliver seamless electrical control across residential, public infrastructure, commercial, and industrial facilities.
In modern commercial centers, the OFEU series protects multi-branch lighting circuits, HVAC blowers, and sub-distribution boards. Its compact modular width (18mm per pole) enables panel builders to optimize space efficiency inside sub-distribution cabinets.
Fitted with D-curve characteristics, OFEU circuit breakers effectively handle inductive inrush currents associated with electric motors, industrial transformers, and power supplies without nuisance tripping.
Used on the AC side of solar string inverters and energy storage system (BESS) output boxes, ensuring stable circuit isolation and immediate fault clearage under harsh ambient temperature swings.
Mission-critical server racks demand continuous power availability. OFEU breakers feature ultra-low internal contact resistance, significantly reducing thermal dissipation inside micro-data server enclosures.
Ideal for integration into AC commercial EV chargers (7kW-22kW), providing dependable line protection alongside OFA RCCB/RCBO earth leakage devices to safeguard end users against residual currents.
Provides robust house-wide circuit management. Fits seamlessly onto standard 35mm DIN rails, pairing effortless installation with intuitive visual trip indication windows.
OFA provides a full spectrum of protection devices engineered to work in dynamic system-level harmony.
MCCB primary function is to make, carry, and break currents under normal circuit conditions, and to break currents under specified abnormal conditions such as overload and short circuit across heavy industrial panels.
Space-saving designs with high breaking performance tailored for distribution boards in modern buildings.
Intelligent Air Circuit Breakers (ACB) act as high-performance core protection, while RCBOs combine overload, short-circuit, and earth leakage protection into one space-saving footprint.
Zero-defect quality strategy backstopped by automated testing, high-precision tooling, and full-process traceability.
Our technical team continuously improves distribution switchgear and control components. Equipped with full-process type testing devices, we verify mechanical endurance, temperature rise limits, and insulation dielectric strength under extreme laboratory overloads.
By introducing automated assembly lines and digital inspection stations, every phase from raw silver contact riveting to final housing ultrasonic welding is tracked. This reduces human error and delivers batch-to-batch consistency.
Before factory dispatch, 100% of OFEU breaker units undergo automated instantaneous magnetic tripping verification, calibration of thermal delay curves, and high-voltage dielectric withstand checks, ensuring complete compliance with international standards (CE, CB, UL).
Pioneering the evolution from passive overload protection to intelligent, active-predictive micro-grid protection architecture.
Optimization of bimetal thermal memory, reduction of internal resistance, standard 6kA/10kA breaking capacity integration, and eco-friendly recyclable housing materials.
Embedding RS485 Modbus, Wi-Fi, and Zigbee communication modules into DIN-rail MCB footprints to deliver real-time energy metering, remote trip control, and over-temperature alerts.
Transitioning from mechanical contact separation to microsecond semiconductor arc interruption, integrated with AI algorithms for predictive fault detection and active fire prevention.
Transparent engineering workflows for standard procurement and customized enterprise integration.
Core Needs: Proven stability, rapid deployment, clear ROI, easy DIN-rail maintenance. Suitable for commercial retrofits and PV grid-tie combiners.
Core Needs: High reliability design, custom tripping curves, private labeling, localized certifications, global supply chain fulfillment.
Evaluating electrical parameters, ambient temperature, breaking capacity, and curve profiles.
Simulating thermal rise and dynamic short-circuit trip limits to guarantee system safety.
Automated assembly and digital quality control checkpoints ensure zero out-of-factory defects.
Secure export packaging, complete documentation, and global logistics execution.
Discover why industrial leaders and system integrators rely on OFA for low-voltage power distribution.
Addressing common queries regarding enterprise capabilities, technical standards, OEM services, and order logistics.
Discover our comprehensive collection of MCCBs, high-amp miniature circuit breakers, RCBOs, and isolation switches.
Contact OFA’s technical and sales engineers immediately to receive a customized quotation or technical consultation for your next giant power project.
OFA Electrical
