Explore our core engineered low-voltage protection units, designed for industrial automation, renewable integration, and smart building management.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is a premier manufacturer and technical innovator based in Yueqing, Wenzhou—the world-renowned Capital of Electrical Appliances in China. We operate under independent proprietary brands such as "OFA", driving continuous advancements in low-voltage power distribution, smart grid hardware, and industrial control switchgear.
Operating with absolute commercial integrity, OFA has been rated as a Tax Credit Grade A Enterprise for seven consecutive years. Our engineering facility integrates automated micro-assembly, 100% SOP full-inspection protocols, and digital type-testing laboratories to output high-performance Miniature Circuit Breakers (MCB), Molded Case Circuit Breakers (MCCB), Air Circuit Breakers (ACB), Residual Current Circuit Breakers (RCCB/RCBO), and Isolator Switches (IS).
Understanding how smart telemetry, microprocessor-based tripping units, and real-time communication modules transform electrical safety and operational efficiency.
Unlike traditional bimetallic thermal-magnetic units, intelligent circuit breakers utilize integrated microcontrollers to constantly measure RMS current, voltage, and harmonics. This enables customizable trip curves (LSIG protection) and ultra-fast arc-fault sensing.
Equipped with Modbus-RTU, RS485, WiFi, Zigbee, or Ethernet interfaces, smart breakers stream power telemetry directly to Energy Management Cloud Systems (EMS) or SCADA, permitting automated remote reset and status reporting.
Through embedded thermistors at critical terminal contacts, intelligent protection equipment identifies abnormal contact resistance elevation long before thermal runaway occurs, mitigating industrial fire risks actively.
Information Gain Insight: Modern industrial procurement no longer evaluates circuit breakers purely on standard short-circuit breaking capacity (Icu/Ics). The key competitive parameter is Predictive Telemetry Efficiency—the ability to prevent operational downtime via early fault detection, transient surge analysis, and automated load shedding.
Engineered for global OEM, ODM, and EPC requirements across residential, commercial, industrial, and solar applications.
| Product Category | Primary Function & Mechanism | Key Technical Specifications | Target Applications |
|---|---|---|---|
| MCCB (Molded Case Circuit Breaker) | Makes, carries, and automatically breaks currents under overload & short-circuit anomalies in main lines. | Frame Current: 63A to 630A+, Electronic/Thermomagnetic Trip, High Breaking Capacity (up to 50kA+). | Main distribution panels, heavy industrial motors, manufacturing facility mains. |
| MCB (Miniature Circuit Breaker) | End-of-line circuit protection against current overload and low-magnitude short circuits. | Poles: 1P, 2P, 3P, 4P; Curves: B, C, D; Breaking Capacity: 6kA, 10kA (OF6KA, OF10KA Series). | Residential sub-panels, commercial lighting branch circuits, OEM machinery panels. |
| ACB (Air Circuit Breaker) | High-capacity universal protection device with deep digital intelligence and multi-channel monitoring. | Currents up to 6300A, Modular Trip Units (OFW1 Intelligent Universal Breaker Series). | Power generation plants, data centers, regional utility sub-stations, transformer protection. |
| RCCB & RCBO | High-sensitivity earth leakage current protection integrated with overload and short-circuit isolation. | Sensitivity: 30mA, 100mA, 300mA; Type A, AC, B residual current protection; Graded selectivity. | EV charging stations, wet laboratory environments, hospital power supplies, domestic circuits. |
| IS (Isolator Switch Series) | Innovatively integrates full protective isolation capability into a compact modular footprint. | Rated Current: 16A to 125A (OFIS-125A, OFIS-BH Series), visible separation index. | Solar PV string isolators, HVAC external cut-off switches, emergency maintenance isolation. |
Electronic BA88, DCM1, DCOF1, OFM1, and OFA-M1 series delivering high breaking capacity and robust system safety.
OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDZ47, OFEU, OFKL-NXB, and OFL7/8 ultra-compact series.
OFW1 Intelligent Universal Circuit Breakers engineered for deep digital integration and flexible expandability.
Procurement managers and electrical project developers face increasing pressure to balance cost efficiency, structural reliability, and fast project timelines. Rooted in Yueqing, Wenzhou—the center of China's low-voltage electrical industry—OFA provides strategic procurement benefits that simplify international supply chains:
A look inside our ISO9001 certified production lines, precision calibration equipment, and type-testing setups.
From solar microgrids to critical enterprise data centers, OFA intelligent equipment guarantees stable operational continuity.
DC-rated MCCBs (DCOF1-125/PV) and high-voltage DC miniature circuit breakers engineered specifically to handle bidirectional current flow, rapid arc suppression, and elevated ambient temperature environments common in solar combiner boxes.
Type A/B RCBOs (OFC, NB1L, OFKL-80A series) designed to protect fast DC and AC electric vehicle chargers against high-frequency residual currents, smooth DC leakage, and lightning voltage spikes.
Ultra-fast tripping MCBs with selective coordination capability, ensuring localized fault isolation without cascading upstream interruptions in mission-critical server racks and UPS units.
Smart breakers integrated into centralized Building Management Systems for automated energy sub-metering, scheduling, and remote emergency tripping upon fire alarm activation.
Motor-protection rated MCCBs capable of handling heavy inductive inrush currents without nuisance tripping, featuring adjustable magnetic overload thresholds.
Distribution switchgear engineered to withstand extreme ambient temperatures, humidity, and high vibrational shock in municipal utility grids and railway stations.
Meeting international electrical safety standards is non-negotiable. OFA circuit breakers are certified and engineered to comply with key global frameworks, ensuring smooth customs clearance and seamless grid acceptance across Europe, the Americas, Asia-Pacific, and the Middle East:
A streamlined, transparent 4-step engineering workflow tailored for distributors, system integrators, and brand owners.
Submit your site electrical parameters, required tripping curves (B/C/D), rated voltages, breaking capacities, and enclosure mounting constraints to our engineering team.
OFA engineers develop dynamic circuit topologies, select precise models (MCB/MCCB/ACB), supply 3D CAD models, and present transparent volume pricing.
We manufacture pilot batch units for customer lab verification, testing dielectric strength, thermal response times, and communication protocol compatibility.
Full-scale automated assembly under ISO9001 standards, complete with custom laser engraving, international export packaging, and freight tracking.
Discover why global power system integrators, facilities managers, and renewable developers trust OFA.
Clear, direct answers regarding corporate capabilities, custom technical parameters, compliance certifications, and global logistics.
Browse our extended range of specialized molded case, high-capacity, and solar DC protective equipment.
OFA Electrical
