Explore our core engineered miniature circuit breakers, DC MCCBs, and protective switchgear for global power grids.
Driving Next-Gen Electrical Reliability from Yueqing, Wenzhou to Global Infrastructure Markets
Founded in 2013 and deeply anchored in Yueqing, Wenzhou—universally recognized as the "Capital of Electrical Appliances in China"—Wenzhou OFA Electrical Technology Co., Ltd. stands as a premier manufacturer and technical innovator in power distribution switchgear, low-voltage protection components, and digital energy management equipment.
Under our flagship proprietary brand "OFA", we engineer complete electrical protection and telemetry ecosystems that meet the rigorous operational demands of industrial manufacturing, renewable power grids (PV/BESS), commercial real estate, heavy infrastructure, and microgrid deployments. For seven consecutive years, OFA has been awarded a Tax Credit Grade A rating, establishing an unshakeable reputation for financial reliability, ethical corporate governance, and operational integrity.
As global industries transition toward Industry 4.0, smart factory automation, and decarbonized energy networks, low-voltage distribution devices have evolved from simple passive thermal-magnetic trip units into active, IoT-enabled diagnostic sentinels. OFA bridges this technological gap by combining lean automated manufacturing with deep field-proven R&D.
Engineered electrical protection platforms designed for harsh environments, high duty cycles, and continuous critical loads.
High-density DIN-rail MCB, RCCB, and RCBO installations designed to prevent electrical fires, earth leakage hazards, and system overloads in modern commercial towers and smart residential complexes.
Heavy-duty Molded Case Circuit Breakers (MCCB) and Air Circuit Breakers (ACB) featuring high short-circuit breaking capacity (Icu/Ics) to protect motor control centers (MCC), PLCs, and heavy machinery lines.
Specialized DC Molded Case Circuit Breakers (up to 1500V DC) tailored for solar combiner boxes, central inverters, and battery racks, offering zero-delay arc extinguishment under DC fault regimes.
Type B & Type A Residual Current Breakers specifically calibrated to detect smooth DC residual currents and high-frequency AC faults inherent in fast EV charger power electronics.
Industrial power networks are increasingly subjected to non-linear loads, high harmonic distortion, and steep surge impulses. OFA’s low-voltage circuit protection devices incorporate silver-alloy contacts, multi-plate arc-chutes, and precision electronic trip units (ETU) to guarantee selective tripping coordination (Selectivity Class 3), preventing cascade outages across critical industrial branches.
A comprehensive overview of our standardized and custom-engineered circuit protection product lines.
Primary power distribution isolation & overload protection from 16A to 1600A.
Precision DIN-rail circuit protection for terminal branch circuits (1A to 125A).
Intelligent main breaker up to 6300A with integrated Modbus micro-processor protection units.
High sensitivity (10mA - 300mA) earth leakage trip units protecting human life against direct contact.
Single-module space-saving overcurrent + earth leakage protection for critical telemetry racks.
High thermal withstand capacity isolators designed for reliable manual safety isolation during maintenance.
How Wenzhou OFA Electrical Technology Co., Ltd. ensures zero-defect factory dispatch for critical power equipment.
Unlike factories relying on batch sampling, OFA enforces a 100% full-process verification protocol. Every trip unit, magnetic coil, thermal bimetal strip, and silver contact undergo automated calibration.
In-house testing rigs rigorously test products for mechanical endurance (up to 20,000 operations), temperature rise limits, dielectric impulse withstand (Uimp), and extreme short-circuit arc quenching capacity.
All OFA component series comply with rigorous global market access frameworks, including IEC 60947-2 (Industrial Circuit Breakers), IEC 60898-1 (Household MCBs), CE marking, and ISO9001 quality management systems.
Transitioning from traditional thermal-magnetic protective devices to intelligent edge IoT analytics.
Next-generation OFA breakers incorporate embedded micro-sensors to wirelessly transmit real-time telemetry (current, phase voltage, internal terminal temperature, and leakage currents) via Modbus RTU/TCP or Wi-Fi to cloud SCADA platforms.
By moving from reactive tripping to active predictive maintenance, OFA’s algorithm-driven trip units analyze contact degradation, ambient heat accumulation, and micro-arc signatures to alert plant engineers prior to cataclysmic equipment failure.
Our commitment to green energy includes substituting legacy halogenated materials with fully recyclable, self-extinguishing polyamides that reduce carbon footprint during moulding without sacrificing flame retardation (UL94-V0 rated).
A structured, risk-mitigated path for EPC contractors, panel builders, and OEM integrators.
Ideal for: Retrofits, building upgrades, standard commercial distribution boards.
Ideal for: Power utility upgrades, multi-megawatt PV microgrids, bespoke switchgear enclosures.
Real feedback from engineers, facilities managers, and system integrators relying on OFA components.
"As a system integrator in Poland, we have collaborated with OFA on several industrial automation projects. Their product range is remarkably comprehensive, covering everything from protective relays to communication gateways. Product quality is consistent, eliminating on-site commissioning delays."
"We purchased OFA's intelligent power monitoring devices to upgrade the power distribution system in our plant in Germany. The installation was seamless, and their devices have operated flawlessly for over a year. The energy telemetry data helped us fix long-standing power loss anomalies."
"Deploying OFA's energy management solution across our commercial properties in Bangkok was a great investment. The system provided deep visibility into electricity consumption. Their technical support team answered all custom configuration questions promptly."
"Our utility PV plant in Chile demanded robust high-DC-voltage circuit protection. OFA's DC MCCBs met all technical specifications at a very competitive price point. Their remote engineering support during commissioning was outstanding."
Connecting with electrical engineers and procurement leaders across major worldwide expos.
Expert engineering answers to common technical queries regarding low-voltage protection equipment.
Select your required model to request technical datasheets, CAD drawings, and factory direct quotations.
OFA Electrical
