Explore our core OEM switchgear portfolio designed for extreme fault level isolation, zero-defect operations, and rapid installation.
In modern industrial grids, residual current devices (RCDs) and low-voltage protection equipment have shifted from simple electromechanical trip units to intelligent, IoT-enabled diagnostic nodes.
Traditional protection relied strictly on passive thermal-magnetic tripping after a fault occurred. Today’s industrial automation environments demand active predictive analysis. Next-generation RCBOs and Smart MCCBs monitor micro-leakage currents, harmonic distortion, and contact wear, broadcasting diagnostic telemetry via Modbus/RS485 or wireless mesh to SCADA systems prior to thermal runaway.
With the exponential expansion of photovoltaic (PV) inverters, variable frequency drives (VFDs), and EV fast-charging stations, smooth DC residual currents can blind standard Type AC RCDs. OEM manufacturers are rapidly shifting production towards Type A and Type B residual current devices capable of detecting high-frequency AC and smooth DC fault currents up to several kilohertz.
As power grid density increases, fault level stress on distribution boards multiplies. Modern commercial installations mandate miniature circuit breakers (MCBs) with 10kA to 15kA breaking capacity (IEC 60898-1) and MCCBs reaching 50kA–100kA breaking capability (IEC 60947-2), featuring zero-arc chute technologies and silver-alloy contact tips.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China. Operating under independent brands such as "OFA", the company delivers high-reliability switchgear and control components engineered for power generation, renewable energy, industrial automation, commercial infrastructure, and OEM equipment manufacturing.
Upholding a rigorous corporate philosophy of "Professionalism, Integrity, and Pragmatic Innovation," OFA has achieved a Tax Credit Grade A rating for seven consecutive years. By combining regional supply chain efficiency with automated precision assembly, OFA guarantees exceptional cost-performance ratios without compromising dielectric strength, mechanical life, or thermal stability.
From main distribution panel protection to terminal load branching, our switchgear series fulfills all low-voltage isolation, overcurrent, short-circuit, and residual earth leakage protection demands.
Designed for primary power distribution control up to 1250A. Features electronic micro-processor trip units or thermal-magnetic trip mechanisms to break heavy fault currents up to 100kA safely under overload and short-circuit conditions.
Series: BA88 Electronic, DCM1, DCOF1, OFM1, OFBLT, OF1, OFA-M1
Compact DIN-rail modular breakers safeguarding commercial and residential branch circuits. Featuring fast arc-extinction chambers, B/C/D tripping characteristic curves, and current ratings from 1A to 125A.
Series: OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, OFP
Dedicated residual voltage-independent electromechanical safety switches detecting earth fault currents (10mA to 300mA sensitivity) to prevent electrocution hazards and electrical fires caused by insulation failure.
Series: OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, OFPM 4P
All-in-one integrated devices packing thermal overload, magnetic short-circuit, and high-sensitivity residual earth leakage protection into a space-saving 1P+N or 3P+N modular width, reducing enclosure footprint by up to 50%.
Series: OFC, OFKL-80A, NB1L, OFMIN, OFOM, OFR1
Heavy-duty intelligent universal main distribution breakers designed for low-voltage power station incoming feeders up to 6300A, offering micro-processor controller units, zone selective interlocking, and busbar isolation.
Series: OFW1 Intelligent Universal Circuit Breaker Series
High-end isolation units providing visible contact separation for safe downstream maintenance. Built with high mechanical endurance, padlocking options, and thermal capacity up to 125A.
Series: OFIS-125A Series, OFIS-BH Series, OFIS-DS Series
Engineered to perform in harsh environmental conditions, high-vibration atmospheres, and high-harmonic industrial grid architectures.
Specialized DC isolators and Type B RCCBs protecting solar strings, multi-MPPT inverters, and energy storage containerized cabinets from high-voltage DC arcs and leakage.
Type A/B RCBOs providing 6mA DC smooth residual current detection according to IEC 62955, eliminating blind spots in AC/DC charging points.
High breaking capacity MCBs (15kA) and selective trip MCCBs maintaining continuous uptime in PDU distribution cabinets, preventing nuisance tripping.
Integrated SCADA-connected breakers offering motor protection curves (Type K/D), shunt trip accessories, and auxiliary status signaling.
How OFA collaborates with global EPC contractors, panel builders, and brand distributors to turn custom switchgear specifications into scalable manufacturing reality.
Engineering review of site single-line diagrams (SLD), ambient temperature compensation requirements, breaking capacity (Icu/Ics), trip curves (B, C, D, K), and accessory integration (auxiliary contacts, shunt trips).
Rapid custom tooling, plastic enclosure flame retardancy (UL94-V0) testing, laser marking, and customized terminal block configuration for private-label brand requirements.
Every batch undergoes 100% thermal-magnetic calibration, dielectric withstand testing (2000V/1min), and secure export packaging for sea, air, or rail shipment.
"As a system integrator in Poland, we collaborated with OFA on multiple factory distribution upgrades. Their product catalog is comprehensive, covering protective relays, MCBs, and MCCBs. Production quality is reliable, significantly reducing commissioning delays."
"We sourced OFA’s power monitoring breakers for workshop power modernization in Germany. The installation was straightforward, and unit trip characteristics matched datasheet specs precisely. Stable operation for over 18 months."
"Our utility-scale PV site in Chile required robust isolators and RCDs capable of operating in dusty, high-altitude conditions. OFA provided engineered samples within 10 days and delivered the complete order on time within budget."
Browse our OEM/ODM custom series engineered for industrial switchboard manufacturers and regional distributors.
Comprehensive technical and commercial answers to help procurement managers and electrical engineers make informed decisions.
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