Explore our core high-performance circuit breakers, precision-engineered to meet stringent international standards for overload, short-circuit, and earth leakage protection.
Modern electrical distribution networks are undergoing a profound paradigm shift driven by high-density industrial automation, distributed renewable energy integration, and stringent carbon neutrality targets. At the core of low-voltage main distribution panels (MDPs) and substations worldwide, the Air Circuit Breaker (ACB) acts as the critical protective safeguard against catastrophic short-circuit faults, extreme overloads, and electrical arc hazards.
Modern ACBs must handle immense thermal and electromagnetic stresses during short-circuit events. Devices manufactured under IEC 60947-2 standards are required to offer superior ultimate short-circuit breaking capacities ($I_{cu}$) alongside matching service breaking capacities ($I_{cs}$), ensuring total operational integrity without catastrophic failure under extreme fault currents reaching up to 100kA or higher.
Legacy mechanical trip mechanisms are rapidly giving way to digital Electronic Trip Units (ETU). Equipped with real-time microprocessors, modern intelligent ACBs enable precise LSI/LSIG protection (Long-time, Short-time, Instantaneous, Ground-fault), energy consumption logging, harmonic spectrum analysis, and seamlessly interface with SCADA and IoT platforms via Modbus-RTU, Profibus, or Ethernet protocols.
In critical industrial facilities such as semiconductor fabrication plants, continuous-process chemical sites, and hyperscale data centers, downstream fault isolation is paramount. High-quality ACBs utilize advanced arc-extinguishing chambers (arc chutes) that eliminate line-to-earth flashover risks while maintaining zero arc-out distance. This allows compact panel assembly design while preventing unnecessary upstream main breaker trips through microsecond selective time-delay grading ($I_{cw}$ withstand ratings).
Rooted in Yueqing, Wenzhou—the Capital of Electrical Appliances in China—OFA Electrical Technology Co., Ltd. has established itself as an authoritative power automation and low-voltage equipment manufacturer since 2013.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is one of the professional suppliers of distribution switchgear and control equipment 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.
Rooted in Yueqing for over a decade, we provide partners with distribution switchgear, control equipment, and supporting products featuring stable performance and cost advantages. We adhere to honest and law-abiding operations, have been rated as tax credit grade A for seven consecutive years, and have earned the long-term trust of numerous global clients.
Our team has solid experience in the R&D and manufacturing of components for power, energy, industrial automation, and other fields, enabling us to provide flexible solutions for different application scenarios. We never compromise on quality, gradually building a reputation as a down-to-earth and responsible electrical manufacturer.
We have introduced automated assembly lines and digital inspection stations, ensuring every step from parts to finished products is under strict in-process control, steadily outputting high-quality products at reasonable cost and minimizing the out-of-factory defect rate.
Our technical team continues to delve deep into the R&D and improvement of distribution switchgear and control equipment accessories, equipped with full-process type testing and factory inspection devices for rigorous verification of mechanical life, temperature rise, and insulation performance.
Our factory strictly adheres to ISO9001 quality management system certification, guaranteeing traceable batch production and standardized component sourcing across all product lines.
Our products comply with international market standards including CE, UL, and IEC standardizations, having served overseas partners in over 50 countries, including Belt & Road and BRICS projects.
We practice eco-responsible manufacturing, optimizing material consumption, reducing thermal losses in contact bridges, and developing compact switchgears with high energy efficiency.
From high-capacity main feed air circuit breakers to sub-circuit miniature units, OFA provides a seamlessly integrated low-voltage component ecosystem.
Our Intelligent Air Circuit Breaker (ACB) product line (such as the OFW1 Intelligent Universal Circuit Breaker Series) is precisely designed as a high-performance core protection and control device for low-voltage mains. Features deep intelligence, modular accessories, and high short-time withstand currents.
MCCB primary function is to make, carry, and break currents under normal circuit conditions, and to break currents under abnormal conditions like overload/short circuit. Includes BA88 Electronic, DCM1, DCOF1, OFM1, OFBLT (e.g., 2P 320A), OF1, and OFA-M1 (63A to 630A) Series.
At the end of modern low-voltage power distribution systems, MCBs protect terminal branch circuits. High performance and space-saving design. Includes OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, and OFP Series.
Specialized high-reliability residual current protection preventing electrocution hazards and insulation failure fires. Includes OFAP6-AC, OFDPN, OFDX, OFGX, OFID 4P DC Residual Current Operated Circuit Breakers, OFL7, and OFPM Series.
Innovatively integrates three core functions—overload protection, short-circuit protection, and earth leakage protection—into a single compact unit. Includes OFC, OFKL-80A, NB1L 1P+N, OFMIN, OFOM, and OFR1 Series.
Innovatively integrates complete switching & isolation functions for safe operational maintenance disconnections. Includes OFIS-125A, OFIS-BH, and OFIS-DS Series (e.g., C63 2P).
Engineering parameters comparing key protection categories to aid EPC contractors and switchboard builders in technical selection.
| Equipment Category | Primary Application Point | Rated Current Range ($I_n$) | Ultimate Breaking Capacity ($I_{cu}$) | Key Protection Characteristics |
|---|---|---|---|---|
| Air Circuit Breakers (ACB) | Main Incomer / Transformer Secondary | 630A - 6300A | 50kA - 120kA | LSI/LSIG, Selective Time Delay ($I_{cw}$), Network Protocol Communications |
| Molded Case Breakers (MCCB) | Sub-distribution Feeders / Heavy Machinery | 16A - 1600A | 25kA - 85kA | Thermal-Magnetic / Electronic Tripping, Compact Footprint, Shunt Trip Option |
| Miniature Circuit Breakers (MCB) | Final Branch Distribution / Control Circuits | 0.5A - 125A | 6kA - 10kA | Fast Magnetic Tripping, DIN-Rail Mounting, High Mechanical Endurance |
| Residual Current Devices (RCBO/RCCB) | Personal Safety & Wet Environment Feeder | 6A - 80A | 4.5kA - 10kA | 10mA - 300mA Earth Leakage Detection, Immediate Differential Tripping |
Our electrical equipment is designed for diverse operational environments, from simple circuit protection to complex multi-energy system integration across public infrastructure, commercial facilities, and heavy industrial plants.
Compact MCBs and high-sensitivity RCBOs safeguarding residential end-users from overloads, short circuits, and dangerous ground fault shocks.
Sub-distribution panelboards in office towers, retail centers, and hospitality projects with optimized heat dissipation and easy busbar integration.
Reliable motor protection circuit breakers and auxiliary contact blocks supporting automated production lines, robotics, and CNC machinery panels.
Specialized DC Molded Case Circuit Breakers (such as DCOF1-250/PV) and high-voltage DC switchgear managing photovoltaic string combiner boxes and inverter outputs.
Edge control devices and IoT-enabled circuit breakers facilitating remote power toggling, smart metering, and automated load shedding.
High-reliability ACBs and MCCBs delivering uninterruptible power supply (UPS) distribution with zero tolerance for nuisance tripping.
Type A and Type B residual current devices combined with heavy-duty breakers for fast DC electric vehicle charging posts.
Bidirectional DC circuit breakers optimized for energy storage containerized banks, protecting lithium batteries against sudden short-circuit surges.
Heavy-duty switchgears deployed across municipal water treatment works, airport terminals, and rail transit power distribution centers.
We provide integrated power and energy management solutions covering the entire process from system planning and hardware-software development to on-site deployment.
Core Needs: Proven solutions, rapid delivery, clear ROI, easy maintenance.
Core Needs: Redundant high-reliability design, system integration, sustainable optimization.
See why global industry leaders, system integrators, and facility managers rely on OFA for their electrical safety systems.
"As a system integrator, our company has collaborated with OFA on several industrial automation projects. Their product range is quite comprehensive, covering everything from protective relays to communication gateways, simplifying procurement and integration work."
"We purchased OFA's intelligent power monitoring devices to upgrade the power distribution system in our old workshop. Setup was simple, integration with our existing system went smoothly, and electricity data helped us identify energy anomalies."
"Deploying OFA's energy efficiency management system for office buildings we manage was a wise decision. The system helped us gain detailed insights into usage across areas and achieve cost savings."
"Our PV project required reliable communication management and data acquisition equipment. OFA's products met our core needs at a reasonable price and adapted well to our local outdoor climate."
Pioneering next-generation electrical safety through active AI diagnostics, eco-friendly materials, and smart microgrid communication architecture.
Transitioning from passive tripping to active fault prediction. Integrating high-speed infrared thermal sensing and high-frequency current wave analysis inside ACB arc chutes allows predictive warning of contact wear prior to arc flashes.
Embedding native wireless protocol stacks (MQTT, NB-IoT) directly into ACB Electronic Trip Units (ETU) to synchronize breaker status, temperature, and trip events with enterprise energy management platforms without external gateways.
Adopting zero-global-warming-potential (GWP) arc extinguishing mediums, lead-free contact alloys, and recyclable thermoplastic housings to meet global ESG compliance for sustainable green building projects.
Find authoritative answers regarding company qualifications, product specifications, customization policies, and international engineering logistics.
Browse our extended range of specialized DC circuit breakers, high-current MCCBs, and modular residual switches.
OFA Electrical
