Direct from Wenzhou OFA Electrical Technology Co., Ltd. — Premium grade miniature circuit breakers engineered for high breaking capacity and rapid trip response.
Driving the continuous progress of power distribution and control technology!
Wenzhou OFA Electrical Technology Co., Ltd. is one of the professional suppliers of distribution switchgear and control equipment in China. Founded in 2013, the company is rooted in Yueqing, Wenzhou — the Capital of Electrical Appliances in China. It owns independent brands such as "OFA", and its products cover multiple industries and applications including power, energy, industrial automation, construction, and equipment manufacturing.
We are committed to enabling power systems to operate safer and smarter through products and services that integrate industry best practices, independent R&D, and strict quality control. Rooted in Yueqing for over a decade, OFA has been providing global partners with distribution switchgear, control equipment, and supporting components that feature stable performance and cost advantages. Adhering to honest and law-abiding operations, OFA has been rated as tax credit grade A for seven consecutive years, earning the long-term trust of numerous global clients.
Our technical team continues to delve deep into the R&D and improvement of distribution switchgear, control equipment, and accessories. Equipped with full-process type testing and factory inspection devices, we execute rigorous verification of mechanical life, temperature rise, short-circuit breaking capabilities, and insulation performance. We never compromise on quality, steadily outputting high-performance products at reasonable costs while minimizing out-of-factory defect rates.
Analyzing procurement requirements, technical compliance, and OEM/ODM strategies across modern B2B supply chains.
Procurement teams demand optimized Total Cost of Ownership (TCO) without sacrificing safety. Through automated assembly lines and lean manufacturing, OFA delivers highly competitive OEM prices with minimal field failure rates.
Modern industrial sites demand MCBs capable of operating reliably across temperature extremes (-25°C to +70°C), high humidity, and vibration-heavy environments like renewable energy plants and mining sites.
With rapid expansion in solar PV, EV charging infrastructure, and Battery Energy Storage Systems (BESS), demand for specialized DC MCBs (up to 1000V DC) with rapid arc-extinction chambers has surged globally.
To assist system integrators and EPC contractors, OFA provides a comprehensive structural breakdown across our complete circuit protection portfolio:
| Device Type | Primary Application Scenario | Rated Current Range (In) | Breaking Capacity (Icu/Ics) | Core Protection Functions |
|---|---|---|---|---|
| MCB (Miniature Circuit Breaker) | Residential, Commercial, Terminal Industrial Distribution | 0.5A - 125A | 4.5kA - 10kA (IEC 60898-1 / 60947-2) | Thermal Overload & Magnetic Short-Circuit Protection |
| MCCB (Molded Case Circuit Breaker) | Main & Sub-distribution Switchboards, Heavy Machinery | 16A - 1600A | 25kA - 100kA | Adjustable Thermal/Electronic Overload, Short-Circuit, Fault Diagnostics |
| RCCB (Residual Current Circuit Breaker) | Personnel Electric Shock & Earth Leakage Fire Prevention | 16A - 100A | Depends on Back-up Fuse / MCB | High-Sensitivity Earth Leakage Current Tripping (10mA - 300mA) |
| RCBO (Residual Current Breaker with Overcurrent) | Compact High-Density Panels, Critical Single Circuits | 6A - 63A | 6kA - 10kA | Combined Overload, Short-Circuit, and Residual Current Protection in 1 Unit |
| ACB (Air Circuit Breaker) | Main Low-Voltage Power Incomers, Industrial Plants | 630A - 6300A | 50kA - 120kA | Intelligent SCADA Communication, Selective Protection, Smart Microgrid Control |
| IS (Isolator Switch) | Main Isolation, Maintenance Disconnection Panels | 16A - 125A | Withstand Current Rated | Safe Physical Circuit Isolation & Load Break Switch |
Standardized & Customized OEM/ODM Manufacturing Portfolio from Wenzhou OFA Electrical Technology Co., Ltd.
Primary function is to make, carry, and break currents under normal circuit conditions, and to make, carry for a specified time, and break currents under specified abnormal conditions such as overload and short circuit. Critical protection device providing protection against overloads.
Models: BA88 Electronic Series, DCM1 Series, DCOF1 Series, OFM1 Series, OFBLT Series, OF1 Series, OFA-M1 Series.
At the end of modern low-voltage power distribution systems, the safety and stability of every circuit rely on a reliable and sophisticated guardian — the Miniature Circuit Breaker (MCB). Featuring space-saving designs and high-performance arc quenching.
Models: OF6KA Series, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, OFP Series.
Our Intelligent Air Circuit Breaker (ACB) product line is precisely designed as a high-performance core protection and control device for main distribution, featuring deep intelligence and flexible expandability.
Models: OFW1 Intelligent Universal Circuit Breaker Series.
Specialized, high-reliability protection solution designed for human safety and fault currents to ground. Features graded protection, easy DIN-rail installation, and instantaneous earth fault tripping.
Models: OFAP6-AC, OFDPN Series, OFDX Series, OFGX Series, OFID Series, OFL7, OFPM Series.
Innovatively integrates three core functions — overload protection, short-circuit protection, and high-sensitivity earth leakage protection — into a single compact unit for full-scenario protection.
Models: OFC Series, OFKL-80A Series, NB1L Series, OFMIN, OFOM, OFR1 Series.
Innovatively integrates complete physical disconnect safety with high load-breaking endurance. Built for technological convergence, reliability, and modern switchboard integration.
Models: OFIS-125A Series, OFIS-BH Series, OFIS-DS Series.
Understanding arc chutes, contact metallurgy, and magnetic tripping curves for optimal system design.
When an MCB breaks high short-circuit currents (up to 10kA at 400V), electric arcing creates localized temperatures exceeding 6,000°C. OFA miniature circuit breakers utilize a multi-grid arc splitter chute featuring 12 to 15 de-ionizing steel plates. This quickly elongates and cools the arc into segmented series arcs within 3 to 5 milliseconds.
Our contact tips utilize high-purity silver-cadmium oxide (AgCdO) or silver-nickel (AgNi) alloys, ensuring zero contact welding, low contact resistance, and prolonged electrical endurance under repeated overload cycles.
| Curve Type | Magnetic Trip Range | Typical Load Applications | OFA Recommended Series |
|---|---|---|---|
| B Curve | 3 In - 5 In | Resistive loads, semiconductor equipment, long cable runs, domestic light circuits | OF6KA, OFL7, OFDP |
| C Curve | 5 In - 10 In | General commercial lighting, household appliances, small motors, control circuits | OF10KA C65, OFD4Z7, OFKL-NXB |
| D Curve | 10 In - 20 In | High inductive loads, industrial transformers, heavy motors, UPS systems, X-ray equipment | OFL8, OFPF, OFAFT |
Delivering uncompromised electrical safety across complex infrastructure environments worldwide.
Ensuring complete safeguard against overload spikes, short circuits, and residual leakage for modern residential consumer units.
Modular protection for high-density distribution boards in office complexes, retail centers, and hospitality facilities.
Precise overcurrent isolation for PLC panels, variable speed drives (VFDs), and automated assembly machinery.
Specialized DC rated MCBs designed to isolate photovoltaic string inputs and combiner boxes up to 1000V DC.
Ultra-reliable selective tripping preventing total rack blackouts during localized server supply faults.
Type B RCCB and RCBO solutions ensuring earth fault isolation for electric vehicle supply equipment (EVSE).
Streamlined OEM/ODM Collaboration and Project Implementation Workflow.
Core Needs: Proven and stable solutions, rapid implementation, clear return on investment, and easy maintenance. Applicable to scenarios such as industrial/commercial energy-saving retrofits, building power monitoring, and distributed PV grid integration.
Review standardized solutions or submit site data. OFA engineers match mature framework solutions immediately.
OFA provides a detailed system configuration list, wiring topology, and energy efficiency benefit simulations.
Transparent quotation generated. Standardized factory inventory enables rapid delivery of stock items.
Clear installation guidelines and remote video guidance ensure smooth commissioning and formal acceptance.
Core Needs: High-reliability design with redundancy, seamless integration with existing systems, professional full-cycle technical collaboration, and sustainable operational optimization.
Technical team conducts deep online or site evaluation to diagnose operational bottlenecks and technical boundaries.
Detailed architecture covering smart hardware + software platforms + system integration confirmed layer by layer.
R&D engineering conducts pre-connection testing in OFA labs to eliminate on-site integration risks.
Assigned project managers cooperate with construction teams for network config, software deployment, and debugging.
Full operator documentation, staff training, and continuous efficiency data reports provided post-deployment.
See why global industry leaders rely on OFA for their low-voltage electrical systems.
A glimpse into our production capabilities, automated assembly lines, and global exhibitions.
Clear, direct answers regarding OFA products, technical capabilities, OEM procurement, and global support.
OFA is a technology enterprise specializing in integrated power automation and energy efficiency management solutions. We provide end-to-end solutions from smart hardware and edge control to cloud analytics, helping global industrial and commercial clients achieve safety, reliability, efficiency, and intelligence in their power systems.
Our core strength lies in our system-level solution capability. We do not just sell individual products. Instead, we leverage over a decade of industry experience to deliver deeply integrated hardware-software solutions tailored to specific operational scenarios, supported by self-developed technology platforms and full project lifecycle engineering support.
Our portfolio includes Smart Hardware (intelligent measurement & control devices, protective relays, MCB, MCCB, RCCB, RCBO, ACB, IS), Software Platforms (Energy efficiency management cloud, SCADA, O&M management), and Turnkey Solutions for distribution automation and microgrids.
Yes, we have strong custom development capabilities. Based on our self-developed platforms, we offer flexible configuration and deep customization in hardware functions, breaking capacity specifications, communication protocols, software interfaces, and physical labeling under a "standard platform + custom application" service model.
Our core products are certified to international standards such as CE, IEC 60898-1, and IEC 60947-2. Our factory operations strictly adhere to ISO9001 quality management system standards. Every single batch undergoes 100% full-inspection SOPs before factory dispatch.
We provide complete project support for international clients including pre-project consultation & solution matching, implementation guides with wiring diagrams & remote video debugging, and post-project remote fault diagnosis and data platform optimization.
We accept common international payment methods including T/T. We offer flexible MOQ policies for standard products. Working with long-term international logistics partners, we arrange sea freight, air freight, or express courier services along with complete export documentation.
An RCBO combines overcurrent, short-circuit, and earth leakage protection within a single compact module. Unlike modular MCB + RCD assemblies, RCBOs reduce external busbar wiring points, minimize thermal resistance, save panel DIN-rail space, and isolate faults on specific single circuits without causing total panel trips.
High-reliability switchgear components direct from our Yueqing manufacturing hub.
OFA Electrical
