Explore our flagship power distribution components engineered for extreme industrial environments, utility grid protection, and renewable energy integration.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou — recognized worldwide as the Capital of Electrical Appliances in China. We specialize in the precision R&D, advanced manufacturing, and global export of high-performance distribution switchgear, medium voltage apparatus, control equipment, and low-voltage protection components.
Upholding independent brands such as "OFA", our solution architecture spans key international sectors including power distribution utilities, renewable energy microgrids, industrial automation plants, commercial infrastructure, and high-tech equipment manufacturing. Rated as Tax Credit Grade A for seven consecutive years, we maintain rigid adherence to legal compliance, operational integrity, and full-process quality control.
Driving Progress in Power Distribution: Our mission is enabling global power networks to operate safer, smarter, and greener through continuous technical innovation, full-process type testing, and tailored engineering support.
Understanding the global transition toward decarbonized power grids, modern medium-voltage distribution architectures, and fault isolation mechanisms.
In modern electrical distribution networks, 11kV (Medium Voltage) system voltage serves as the primary backbone for primary sub-transmission and primary distribution grids. 11kV Vacuum Circuit Breakers (VCBs) and Air Insulated/Gas Insulated Switchgear (AIS/GIS) act as the frontline defense against thermal overloads, short-circuit earth faults, and transient network anomalies. China's manufacturing ecosystem provides critical cost efficiency, technological density, and rapid scalability for international utilities seeking supply chain resilience.
The industry pivot away from Sulfur Hexafluoride (SF6) gas due to high Global Warming Potential (GWP) has accelerated the demand for 11kV Vacuum Interrupters (VI). Utilizing advanced copper-chromium (CuCr) contact metallurgy, 11kV VCBs extinguish electrical arcs during zero-current crossing within a high-vacuum chamber (<10-5 Pa). This prevents contact erosion, eliminates toxic gas byproducts, and guarantees up to 10,000 to 30,000 mechanical operations without maintenance.
Commercial installations, heavy manufacturing units, and utility substations require circuit breakers capable of handling rated short-circuit breaking currents up to 31.5kA or 40kA at 11kV. The equipment must execute standard duty cycles such as O - 0.3s - CO - 15s - CO without mechanical failure or thermal runaway, safeguarding multimillion-dollar power transformers, busbars, and downstream switchboards.
From mechanical spring mechanisms to smart IoT condition monitoring, explore how Chinese manufacturers lead power equipment innovation.
Traditional air or oil insulation is being rapidly replaced by Automatic Pressure Gelation (APG) epoxy resin solid encapsulation. Solid-insulated 11kV vacuum breakers shield live conductor parts from harsh environmental factors like ambient moisture, salt spray, chemical dust, and high altitude degradation.
Moving beyond conventional spring-operated mechanisms, Permanent Magnet Actuators reduce mechanical component counts by up to 60%. With fewer moving latches, gears, and springs, PMA drives deliver sub-cycle response times, eliminating mechanical fatigue and enhancing operational endurance for smart grid automatic reclosers.
Next-generation 11kV equipment features embedded fiber-optic temperature sensors, contact wear tracking, dynamic vibration analysis, and micro-controller telemetry. Supporting IEC 61850 GOOSE communications, these breakers transition utility maintenance from reactive repair to AI-driven predictive health monitoring.
A complete electrical system relies on seamless coordination between primary 11kV MV breakers and downstream Low Voltage (LV) distribution gear. OFA manufactures complete, co-ordinated protection lineups.
OFA MCCBs deliver primary isolation and overload protection for secondary industrial distribution panels. Primary functions include making, carrying, and breaking normal current cycles alongside specified fault short circuits.
Serving as terminal point guardians, OFA MCBs safeguard commercial and residential final circuits. Compact, DIN-rail mounted designs deliver fast arc quenching and precise trip curves (B, C, D curves).
Our Intelligent Air Circuit Breakers (OFW1 series) serve as main incoming power guardians in low-voltage substations, handling continuous currents up to 6300A with deep micro-processor intelligence.
OFA residual current devices combine ground fault leakage protection with thermal-magnetic overcurrent trips, preventing electric shock hazards and insulation fire risks in sensitive facilities.
The IS Series seamlessly merges high-capacity main load disconnection with physical isolation gaps, giving maintenance engineers absolute safety during downstream system servicing.
From utility substations to hyperscale data centers, discover how our custom power solutions fit rigorous operational environments.
Solar step-up transformer substations require 11kV VCBs capable of enduring high ambient temperatures, harmonic distortion, and frequent bidirectional switching cycles. OFA supplies localized high-altitude and solar-tailored breaker assemblies.
Uninterrupted operational availability demands dual-feed 11kV ring main units (RMU) coupled with ultrafast automatic transfer switches (ATS). Low partial discharge rates (<5pC) ensure zero system downtime for server racks.
Megawatt-level electric vehicle charging stations place intense dynamic impulse loads on localized medium-voltage transformers. OFA's coordinated breaker setups safeguard municipal grids from harmonic transients.
Corrosive atmosphere environments require solid-insulated epoxy switchgear housings. Our dust-proof and moisture-sealed switchboards exceed IP65 protection specs, meeting harsh mining and oil & gas standards.
Inside Wenzhou OFA's Yueqing manufacturing ecosystem: How certified compliance guarantees zero out-of-factory defects.
Quality is our non-negotiable baseline. Unlike manufacturers that rely on random sampling, OFA enforces a 100% full-inspection SOP across every single component leaving our assembly line.
Transparent, structured technical collaboration designed for EPC contractors, system integrators, and OEM partners.
See how partners in over 50 countries optimize their power reliability with OFA circuit breaker solutions.
Direct answers to crucial technical queries regarding 11kV circuit breaker selection, OEM capabilities, and compliance standards.
Complete your electrical distribution architecture with our full suite of certified low-voltage circuit breakers and isolator switches.
Engineered for high reliability, competitive cost advantages, and lifetime support. Contact Wenzhou OFA Electrical Technology Co., Ltd. today for technical consultations and targeted project quotes.
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