Engineered for high breaking capacity, rapid thermal-magnetic tripping responses, and industrial safety compliance.
In modern low-voltage electrical distribution networks spanning commercial complexes, industrial plants, renewable microgrids, and high-density residential buildings, the safety and operating continuity of downstream circuits depend on dependable protective devices. The OFDZ47 Series Miniature Circuit Breaker (MCB) is developed specifically to serve as an indispensable barrier against overcurrent, electrical overloads, and high-energy short-circuit faults.
Rooted in low-voltage electrical engineering expertise, the OFDZ47 platform combines precision bimetallic thermal element mechanisms for inverse-time overload protection with electromagnetic instantaneous release coils for instant short-circuit isolation. Engineered with flame-retardant thermohardening polymer housings (V-0 rating), high-extinction arc chutes, and silver-alloy contact tips ($AgNi$ or $AgSnO_2$), OFDZ47 units achieve superior breaking capacity, minimal contact erosion, and long mechanical endurance.
| Parameter | Technical Specification |
|---|---|
| Standard Compliance | IEC/EN 60898-1, IEC 60947-2, GB/T 10963.1 |
| Rated Current ($I_n$) | 1A, 3A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Pole Configurations | 1P, 2P, 3P, 4P (DIN-rail mounted) |
| Tripping Characteristics | B Curve (3-5 $I_n$), C Curve (5-10 $I_n$), D Curve (10-14 $I_n$) |
| Rated Voltage ($U_e$) | 230V/400V AC (50/60 Hz), DC variants up to 250V/1000V |
| Insulation Voltage ($U_i$) | 500V AC |
| Protection Degree | IP20 (IP40 in modular distribution enclosure) |
| Electrical/Mechanical Life | 10,000 Operations / 20,000 Operations |
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China. Over a decade of focused industrial accumulation has enabled OFA to evolve into a leading specialized manufacturer of power distribution switchgear, miniature circuit breakers, molded case circuit breakers, residual current devices, and industrial automation equipment.
We own independent proprietary brands such as "OFA" while acting as an experienced OEM/ODM partner for major global electrical distributors. Adhering to honest, transparent, and law-abiding operations, OFA has been officially rated as a Tax Credit Grade A Enterprise for seven consecutive years, earning enduring trust across international markets.
Driven by continuous progress in power distribution and control technology, OFA operates state-of-the-art automated assembly lines, digital inspection stations, and rigorous SOP quality control protocols to ensure every unit shipped meets stringent safety guidelines.
Our dedicated R&D team continuously refines arc quenching, contact geometry, and release mechanisms. Full-process type testing verifies mechanical life, thermal temperature rise, and dielectric insulation.
Combining standardized lean manufacturing with flexible OEM/ODM customization allows precise matching of client specifications while optimizing raw material utilization and cost-efficiency.
Automated assembly lines, laser marking systems, and online calibrated trip testing stations ensure zero-defect quality standards across every single pole leaving our facility.
Certified under ISO9001, our facility executes 100% full-inspection standard Operating Procedures (SOP), fulfilling international market access standards like CE, CB, and IEC.
Leveraging Wenzhou's industrial cluster to provide global partners with unmatched lead-time predictability and cost control.
Being located at the heart of China's largest low-voltage electrical cluster gives OFA direct access to top-grade raw materials (copper, silver alloy contacts, flame-retardant PA66 plastics) and specialized tooling within hours, eliminating supply chain bottlenecks.
From raw material incoming inspection (IQC) to in-process assembly calibration (IPQC) and final pre-shipment sampling (FQC), OFA enforces strict batch traceability to guarantee long-term operational safety in demanding environments.
With an extensive plant footprint, scalable modular assembly workstations, and over 96 skilled assembly personnel, OFA easily handles high-volume rush procurement orders without compromising quality standards.
Explore OFA's full line of protective devices engineered for diverse voltage tiers and operational scenarios.
Designed for main power distribution units and heavy industrial motor protection. Features adjustable thermal-magnetic and electronic trip units.
Compact, DIN-rail protective devices safeguarding branch circuits against overloads and short circuits in sub-distribution boards.
Specialized earth leakage protection units designed to prevent human electrocution and electrical fire hazards caused by insulation degradation.
High-capacity intelligent universal circuit breakers for main low-voltage switchboards in data centers, hospitals, and heavy plants.
High-reliability isolation switches and DC molded case breakers specially optimized for photovoltaic solar arrays and battery storage (BESS).
Tailored electrical equipment solutions featuring private label branding, customized trip characteristics, special enclosure colors, and custom packaging.
Deploying dependable circuit protection across diverse operational environments worldwide.
Providing high-density protection for consumer units and main distribution boards in apartment complexes, hotels, and office buildings. Ensures circuit selectivity to prevent nuisance total blackouts.
Custom DCOF1-250/PV breakers engineered specifically to handle high DC arc extinction requirements present in rooftop PV arrays, solar combiner boxes, and Battery Energy Storage Systems (BESS).
Guarding sensitive PLCs, variable frequency drives (VFDs), motor starters, and robotic control panels against transient surge currents and heavy inductive load overloads.
Delivering high-reliability ACBs and MCBs for server rack PDU protection, uninterrupted power supply (UPS) distribution panels, and critical backup generator changeover systems.
Specialized Type A / Type B residual current devices (RCBOs/RCCBs) designed to handle DC residual fault currents in electric vehicle AC wallboxes and fast DC charging piles.
Proven track record in Belt & Road municipal infrastructure, hospital backup power grids, airport terminal distribution systems, and educational institution facility upgrades.
Navigating the digital transformation of electrical distribution with smart, connected circuit protection.
Integrating RS485 Modbus and wireless IoT microchips into modular breakers, enabling real-time remote current tracking, voltage monitoring, energy metering, and predictive fault notifications directly to cloud dashboards.
Next-generation R&D exploring semiconductor-assisted breaking mechanism to achieve sub-millisecond fault isolation, drastically lowering arc energy ($I^2t$) and eliminating contact wear under heavy short circuits.
Adopting halogen-free thermoplastic materials and lead-free contact alloys to fulfill global RoHS and REACH environmental mandates, advancing sustainable green manufacturing across the product lifecycle.
From initial inquiry to site delivery, OFA ensures transparent engineering collaboration and rapid fulfillment.
Consultation with technical engineers to match electrical parameters, breaking capacity requirements, ambient temperature derating, and regional certification criteria.
Rapid dispatch of evaluation samples for client laboratory type testing, mechanical verification, and enclosure fitment confirmation prior to mass order commitment.
Automated manufacturing supported by strict SOP in-process inspections, terminal temperature rise verification, and custom laser branding/labeling.
Export packaging, container loading coordination (FOB/CIF/DDP), complete customs documentation, and post-delivery engineering support throughout the product lifecycle.
Discover why leading international electrical partners rely on Wenzhou OFA Electrical.
"As a system integrator, our company has collaborated with OFA on several industrial automation projects in Central Europe. Their product range is quite comprehensive, covering everything from protective relays to communication gateways, which simplifies our procurement work. The product quality is consistent."
"We purchased OFA's intelligent power monitoring devices to upgrade the distribution system in our workshop. The setup was simpler than expected, and integration went smoothly. They have been running stably for over a year, helping us identify previously unnoticed energy anomalies."
"Deploying OFA's energy efficiency management system for commercial office buildings was a wise decision. The system helped us gain detailed insights into electricity usage and achieve energy savings. Their technical support team is highly responsive."
Discover additional standard breaker series tailored for specialized industrial and commercial panel requirements.
Expert answers regarding OFDZ47 technical selection, manufacturing capabilities, and global procurement terms.
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