Explore our primary industrial catalog of high-performance OFDPN miniature circuit breakers, RCBOs, and MCCB units engineered for precision circuit isolation and automated fault protection.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. operates from Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China. Over a decade of specialized industrial manufacturing has established OFA as an authoritative tier-1 supplier of distribution switchgear, control equipment, and terminal circuit protection devices.
Our operations strictly adhere to international engineering paradigms. By holding tax credit Grade A status for seven consecutive years and operating under full ISO9001 Quality Management System accreditation, we provide OEM, ODM, and EPC procurement partners across 50+ countries with robust hardware, predictable delivery lifecycles, and traceable reliability.
Why Modern Industrial Switchboards Are Transitioning from Traditional 2P Breakers to High-Density 18mm OFDPN Solutions.
Standard 2-pole circuit breakers require a 36mm DIN-rail footprint. The OFDPN series achieves phase (L) overload thermal-magnetic protection and switching neutral (N) path isolation within a single standard 18mm module width. This doubles panel enclosure density without compromising clearance.
Equipped with a synchronized mechanical linkage, the OFDPN breaker disconnects both live and neutral conductors simultaneously upon fault detection or manual operation. This prevents neutral floating voltages from back-feeding into downstream control logic and human operators.
Utilizing a 12-plate arc chute matrix combined with magnetic blow-out runners, the OFDPN series rapidly splits electrical arcs generated during short circuits, quenching high-voltage ionization gases in under 10 milliseconds ($t < 10ms$).
The following data grid outlines key operational parameters tailored for power distribution engineers, panel builders, and procurement officers.
| Technical Parameter | OFDPN MCB (1P+N) | OFDPN RCBO (1P+N / 2P) | Industrial Benchmark (Standard) |
|---|---|---|---|
| Rated Current ($I_n$) | 6A, 10A, 16A, 20A, 25A, 32A, 40A | 6A, 10A, 16A, 20A, 25A, 32A, 40A | IEC 60898-1 Standard Range |
| Rated Voltage ($U_e$) | 230V / 240V AC (50/60Hz) | 230V / 240V AC (50/60Hz) | 230V nominal single-phase systems |
| Breaking Capacity ($I_{cn}$) | 4.5kA / 6.0kA / 10.0kA | 6.0kA / 10.0kA | Class 3 Energy Limiting ($I^2t$) |
| Tripping Characteristics | B Curve (3-5 $I_n$), C Curve (5-10 $I_n$), D Curve (10-14 $I_n$) | B & C Curve | EN 60898-1 Instantaneous Trip Curve |
| Residual Current ($I_{\Delta n}$) | N/A | 10mA, 30mA, 100mA, 300mA (Type AC & Type A) | IEC 61009-1 High Sensitivity protection |
| Pole Width Footprint | 18mm (1 Pole Module) | 18mm (Compact) / 36mm | DIN 43880 Standard Sizing |
| Mechanical / Electrical Life | 20,000 / 10,000 Operations | 20,000 / 10,000 Operations | ISO Heavy Industrial Grade Requirement |
| Protection Degree & Casing | IP20 (IP40 in enclosure), Flame Retardant VO | IP20 (IP40 in enclosure), Self-Extinguishing | IEC 60529 / UL94-V0 compliance |
Wenzhou OFA Electrical Technology Co., Ltd. supplies integrated electrical component solutions customized to diverse commercial, renewable, and industrial infrastructure demands.
In high-density commercial real estate, data hubs, and retail centers, distribution space is severely limited. OFDPN 1P+N MCBs allow panel builders to integrate up to double the circuit branch outputs within standard lighting and power distribution boards (PDBs), ensuring localized isolation without increasing enclosure footprint.
Deploying renewable energy requires robust AC/DC component isolation. Alongside our specialized DCOF1-125/PV DC Miniature Circuit Breakers, the OFDPN AC series acts as a robust secondary protection unit on inverter output AC combiner boxes, protecting battery energy storage systems (BESS) from grid fluctuations.
Precision PLCs, robotics controllers, and automated conveyor systems demand noise-free, reliable tripping dynamics. OFDPN breakers with Type C/D curves handle high inductive inrush currents from small motors and control transformers while safeguarding delicate semiconductor relays.
Integrating OFDPN RCBOs into commercial Level-2 EV charging posts provides essential Type A or Type AC 30mA residual current protection alongside overcurrent tripping, ensuring user safety during cable plugging and vehicle charging cycles.
Remote cellular towers and outdoor telecom cabinets require compact components capable of functioning reliably across ambient temperature swings (-25°C to +60°C). OFDPN breakers deliver consistent trip calibration under harsh environmental conditions.
Homeowners upgrading electrical panels to support modern high-wattage appliances (heat pumps, induction cooktops) benefit from OFDPN breakers. Existing sub-panels can double their available sub-circuits without replacing the main metal enclosure.
For global electrical wholesalers, catalog distributors, and system integrators, selecting a trustworthy manufacturing partner is paramount. Wenzhou OFA Electrical Technology Co., Ltd. has refined a comprehensive supply chain model designed to eliminate technical risk and shorten delivery windows.
Engineering evaluation of nominal voltage, breaking capacity, breaking curve (B/C/D), and ambient operating parameters.
Dispatch of customized samples for client laboratory validation, dielectric testing, and enclosure fitment check.
Automated calibration, laser etching, and 100% routine testing under ISO9001 certified shop-floor controls.
Export-grade seaworthy packaging, customs documentation support, and dedicated post-sales technical assistance.
As global power distribution transitions toward IoT integration, smart microgrids, and active energy management, OFA’s R&D division is advancing core circuit breaker technologies.
Integrating miniature RS485 / Modbus RTU communication chips into DIN-rail circuit breakers. Real-time monitoring of current telemetry, line operating temperatures, leakage current levels, and remote open/close actuation.
Researching semiconductor-assisted contact arc reduction to achieve microsecond ($<100\mu s$) fault clearing times. Solid-state architecture virtually eliminates physical contact erosion, dramatically increasing electrical lifespan.
Transitioning to 100% halogen-free, recyclable polymer housings and lead-free contact matrices compliant with evolving global environmental mandates (RoHS 3.0 & REACH).
Expert responses regarding OFDPN series selection, operational mechanics, installation compliance, and supplier logistics.
Browse additional heavy-duty switchgear units, molded case circuit breakers, DC solar breakers, and high-sensitivity RCBO series manufactured by OFA.
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