Explore our premium OEM/ODM range engineered for commercial, industrial, and residential protection.
Driving the Continuous Progress of Power Distribution and Control Technology Worldwide
Founded in 2013 and deeply rooted in Yueqing, Wenzhou—the world-renowned Capital of Electrical Appliances in China—Wenzhou OFA Electrical Technology Co., Ltd. has established itself as an industry benchmark in the research, development, and high-precision manufacturing of low-voltage distribution switchgear, control equipment, and specialized accessories.
Holding independent proprietary brands such as "OFA", our enterprise empowers global energy networks across power utilities, commercial construction, renewable solar integration, industrial automation, and EV charging infrastructure. Rated as a Tax Credit Grade A Enterprise for seven consecutive years, we maintain an uncompromising commitment to legal compliance, ethical trade, and engineering transparency.
Comprehensive breakdown of pole configurations, tripping curves, arc suppression, and breaking capacities for OEM sourcing.
Voltage Alignment: 230V/240V AC Single Phase.
Operational Scope: Switches and protects only the live (phase) conductor. Ideal for final sub-circuit branch protection in residential, light commercial, and control circuit isolation where neutral switching is not mandated.
Voltage Alignment: 230V/400V AC & DC Networks.
Operational Scope: Switches both live and neutral phases simultaneously (or 2 live phases in split-phase systems). Provides complete galvanical isolation essential for high-risk appliances, solar DC strings, and sub-panels.
Voltage Alignment: 400V/415V/690V Three-Phase AC.
Operational Scope: Controls three live phase conductors (L1, L2, L3) without neutral breaking. Standardized for 3-phase industrial electric motors, HVAC compressors, pumps, and balanced industrial loads.
In modern IT, TN-S, and TT earthing infrastructure, 4P circuit breakers play a critical safety role. Unlike 3P+N breakers (where the neutral pole is un-switched or only offers non-protected isolation), true 4P breakers feature full thermal-magnetic overload and short-circuit trip units across all four poles (3 Phases + Neutral). This setup eliminates risks associated with neutral floating, harmonic zero-sequence currents caused by non-linear loads (such as variable frequency drives and server power supplies), and reverse back-feed risks during automatic transfer switch (ATS) operations.
| Breaker Type | Pole Configuration | Rated Current ($I_n$) | Ultimate Breaking Capacity ($I_{cu}$) | Tripping Characteristic Curves | Typical Industrial Scenarios |
|---|---|---|---|---|---|
| MCB (OF6KA / OF10KA) | 1P, 2P, 3P, 4P | 0.5A to 125A | 6kA / 10kA (IEC 60898-1) | B Curve (3-5 $I_n$), C Curve (5-10 $I_n$), D Curve (10-20 $I_n$) | Distribution boards, residential branch protection, lighting. |
| MCCB (OFM1 / DCM1) | 1P, 3P, 4P | 16A to 1600A | 25kA / 35kA / 50kA / 85kA | Adjustable Thermal-Magnetic / Microprocessor Electronic Trip | Main feeder panels, motor control centers, heavy industrial units. |
| DC Breaker (OF1-250/PV) | 1P, 2P, 4P | 10A to 630A DC | Up to 1500V DC / 20kA | Specialized DC magnetic release curve | Solar PV string boxes, BESS energy storage, DC microgrids. |
| RCBO / RCCB (OFL7 / OFC) | 1P+N, 2P, 3P+N, 4P | 6A to 100A | 6kA / 10kA (Residual $I_{\Delta n}$: 30mA - 300mA) | Type AC, Type A, Type B (DC sensitive residual) | EV Chargers, medical rooms, wet industrial environments. |
| ACB (OFW1 Intelligent) | 3P, 4P | 630A to 6300A | 65kA / 85kA / 120kA | Digital Microprocessor SCADA Integration | Primary sub-station main breakers, data centers, power plants. |
Engineered hardware and custom OEM solutions tailored to complex global operating environments.
Custom DC breakers (up to 1500V DC) engineered with permanent magnet arc-extinguishing chutes to rapidly break high-energy DC arcs in string inverters and Battery Energy Storage Systems (BESS).
Specialized Type B RCBO and 4P MCB protection designed to withstand high DC smooth fault currents and high surge currents associated with commercial 3-phase fast chargers.
High breaking capacity (10kA-25kA) 2P and 4P breakers providing strict selective tripping coordination, preventing widespread power loss during localized server rack fault conditions.
Integrated Modular DIN-rail circuit breakers paired with auxiliary alarm contacts and remote shunt trips for building management systems (BMS) and intelligent energy metering.
Heavy-duty Molded Case Circuit Breakers (MCCB) up to 1600A with adjustable magnetic pickups designed to handle high inductive inrush currents from large industrial machinery.
Robust distribution switchgear tested to operate reliably across extreme ambient ranges (-25°C to +70°C), supporting municipal power networks and transport infrastructure.
From custom plastic injection and stamping to automated mechanical calibration and type testing.
OFA Electrical Technology operates an ISO9001 certified manufacturing plant equipped with digital assembly lines, laser-guided contact alignment systems, and multi-stage automated testing stations.
Technical specification review, 3D modeling, and CAD circuit topology matching.
Precision mold fabrication, contact stamping, and rapid sample prototyping.
Robotic element welding, arc chute positioning, and housing riveting.
Dielectric strength, temperature rise testing, and global export packaging.
Discover how next-generation circuit protection is evolving from passive tripping to active predictive maintenance.
Modern smart breakers integrate RS485 Modbus, Wi-Fi, and Zigbee communication protocols, enabling real-time telemetry of active power, temperature, current leakage, and harmonic distortion directly to cloud platforms.
Transitioning from mechanical contacts to semiconductor switching (GaN/SiC MOSFETs), offering breaking times under 1 microsecond—1000x faster than traditional mechanical arc chute dissipation.
Algorithms continuously monitor thermal degradation, contact wear, and load cycles, predicting component end-of-life and alerting facility managers long before unexpected power outages occur.
Ensuring frictionless international trade and safety compliance across major global markets.
Clear expert answers regarding ordering, technical specs, customization, and supply logistics.
High-reliability componentry engineered for global industrial and commercial projects.
OFA Electrical
