Explore our flagship series of miniature and molded case circuit breakers designed specifically for harsh DC solar applications, utility-scale arrays, and commercial distribution networks.
The global energy transition has driven rapid scaling of solar photovoltaic (PV) systems and battery energy storage systems (BESS). As system voltages shift from legacy 1000V DC to ultra-efficient 1500V DC architectures, circuit protection demands have intensified exponentially.
Modern utility-scale solar farms utilize 1500V DC topology to reduce balance-of-system (BOS) costs, lower cable copper consumption, and minimize transmission line losses. However, breaking DC arcs at 1500V without natural zero-crossing points requires innovative multi-pole series arc chutes and permanent magnet blowouts engineered into custom DC circuit breakers.
With solar storage systems becoming ubiquitous, DC circuit breakers must handle complex bidirectional current flows during battery charging and discharging cycles. Advanced non-polarized DC MCCBs ensure safe trip operation regardless of current direction, preventing thermal runaway and catastrophic equipment failure.
The integration of microprocessors into molded case circuit breakers enables real-time sensing of contacts temperature, load current waveforms, insulation degradation, and early arc fault detection. Digital Modbus/RS485 and CAN communication interfaces seamlessly feed data into SCADA and energy platforms.
Unlike Alternating Current (AC), which naturally passes through zero voltage 100 or 120 times per second, Direct Current (DC) maintains a continuous electric arc when contacts separate under load. To extinguish a 1500V DC arc within milliseconds, OFA PV Circuit Breakers integrate specialized silver-alloy main contacts, high-magnetic magnetic blow-out coils, and elongated arc runner splitter plates. This forces the electric arc into multi-chamber arc chutes, rapidly increasing arc voltage above the system operational voltage to achieve instantaneous interruption.
International EPC contractors, solar panel integrators, and commercial developers require strict adherence to international electrical standards to guarantee 25-year solar asset reliability.
| Standard / Certification | Target Region | Technical Focus & Application Scope | OFA Compliance Standard |
|---|---|---|---|
| IEC 60947-2 (Annex P) | Europe, Asia, Middle East | Low-voltage switchgear - DC circuit breakers for photovoltaic installations up to 1500V DC. | 100% Certified / Full Type Test Reports |
| UL 489B | North America, LATAM | Molded-Case Circuit Breakers, Switches, and Circuit-Breaker Enclosures for Photovoltaic (PV) Systems. | Engineered to meet stringent UL dielectric & endurance curves |
| AS/NZS IEC 60947.3 | Australia, New Zealand | Switches, disconnectors, switch-disconnectors and fuse-combination units for residential/commercial PV arrays. | Classified for rooftop outdoor installation IP66 rated enclosures |
| GB/T 14048.2 | China, Belt & Road Markets | Low-voltage switchgear and controlgear - Circuit-breakers for heavy industrial and power grid automation. | CCC Certified with Tax Credit Grade A manufacturing verification |
Situated in Yueqing, Wenzhou—the globally recognized Capital of Electrical Appliances—Wenzhou OFA Electrical Technology Co., Ltd. combines localized supply chain density with digital smart manufacturing.
Yueqing’s industrial ecosystem provides zero-distance sourcing for precision copper stamping, silver-cadmium contact alloys, flame-retardant BMC/PA66 plastics, and custom arc chutes. This structural cost advantage enables OFA to offer high-performance protection gear at competitive price points without compromising materials engineering.
From automated SMT circuit board soldering for trip units to robotized calibration of thermal bimetal strips, our digital assembly lines enforce zero-defect quality control. Every batch undergoes 100% routine dielectric withstand tests, contact resistance measurement, and mechanical endurance cycling prior to export.
Wenzhou OFA Electrical Technology Co., Ltd. delivers engineered switchgear components tailored for grid stability, solar protection, energy storage systems, and industrial automation.
Designed to make, carry, and interrupt currents under normal conditions and safely break high fault short-circuit currents up to 80kA. Includes BA88, DCM1, DCOF1, OFM1, and OFBLT series with ratings up to 800A/1500V DC.
Essential final distribution protection for branch circuits. Featuring high breaking capacity (6kA/10kA), DIN-rail mounting, compact footprints, and customized tripping curves (B, C, D, K, Z) for solar arrays and building automation (OF6KA, OF10KA, OFL7, OFL8, DCOF1-125/PV).
High-capacity main distribution circuit breakers (OFW1 series) for main incoming panels, transformer stations, and heavy industrial facilities. Features intelligent micro-processor controllers, selective protection, and remote operation capabilities.
Dedicated earth leakage protection devices (OFAP6-AC, OFDPN, OFDX, OFGX, OFID) designed to detect micro-ampere residual leakage current, safeguarding personnel from fatal electrical shocks and preventing fire hazards caused by insulation deterioration.
Innovatively unifies overload, short-circuit, and high-sensitivity earth leakage protection into a single modular unit (OFC, OFKL-80A, NB1L, OFMIN). Saves up to 50% cabinet space compared to combined MCB + RCD modules.
High-reliability isolation switches (OFIS-125A, OFIS-BH, OFIS-DS) designed for visual contact gap verification during maintenance on solar string combiner boxes, inverter DC disconnects, and industrial sub-panels.
From harsh desert utility solar farms to high-humidity coastal commercial rooftops and mission-critical data centers, OFA electrical components deliver reliable power protection globally.
Installed directly between solar module strings and central/string inverters. Built to withstand continuous high DC operational temperatures up to +70°C inside sealed NEMA/IP65 combiner enclosures.
Compact MCBs and MCCBs provide reliable isolation and overcurrent protection for commercial factory rooftops, helping businesses meet carbon-neutrality goals while protecting structural real estate investment.
High-capacity DC MCCBs safeguard lithium-ion battery racks, containerized energy storage units, and microgrid power conversion systems (PCS) from extreme short-circuit fault currents during thermal runaway events.
Integrates specialized Type B RCCBs and high-capacity MCBs into ultra-fast DC electric vehicle chargers to prevent insulation breakdown, direct current residual leakage, and grid disruption.
Mission-critical power backup systems depend on OFA ACB and MCCB units to handle rapid load transfer switching, high inrush currents, and severe harmonic distortion in hyperscale facilities.
Deployable in smart municipal lighting grids, railway electrification switchgear, water treatment control panels, and highway traffic management distribution boxes.
Discover why system integrators, EPC developers, and commercial maintenance engineers in over 50 countries choose Wenzhou OFA Electrical Technology Co., Ltd.
From standard catalogue order fulfillment to complete custom OEM circuit breaker development, OFA delivers end-to-end engineering collaboration.
Ideal for: Rapid inventory replenishment & standard solar project installations.
Ideal for: Switchgear brand owners, solar inverter manufacturers, and specialized EPC contracts.
Clear, authoritative answers regarding solar PV circuit breaker selection, technical parameters, manufacturing standards, and export logistics.
Discover our comprehensive range of high-performance DC breakers, high-capacity molded case units, and modular sub-panel accessories.
Rooted in Yueqing, Wenzhou—the Capital of Electrical Appliances in China—OFA has spent over a decade advancing low-voltage electrical protection and grid distribution switchgear. Adhering to honest, law-abiding operations and rated as Tax Credit Grade A for seven consecutive years, we provide global partners with stable performance, competitive pricing, and responsive engineering support.
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