Engineered for maximum reliability, extreme arc quenching performance, and global regulatory compliance.
Addressing the complex engineering challenges of high-voltage direct current (HVDC) distribution in green energy and industrial automation ecosystems.
As global energy transitions accelerate toward clean electrification, direct current (DC) power networks have emerged as the foundational infrastructure for utility-scale photovoltaic (PV) plants, commercial Battery Energy Storage Systems (BESS), electric vehicle (EV) supercharging hubs, and modern telecom datacenters. Unlike traditional alternating current (AC) systems where current naturally crosses zero twice per cycle—facilitating standard arc suppression—direct current maintains a continuous voltage potential. Intercepting high-ampere DC fault currents at 80 Amperes across operating voltages up to 1000V DC or 1500V DC presents severe electrical dynamics, extreme thermal stress, and persistent ionization arcs.
Wenzhou OFA Electrical Technology Co., Ltd., operating from Yueqing, Wenzhou—the acknowledged Capital of Electrical Appliances in China—delivers advanced OEM 80a DC Circuit Breaker Solutions purpose-built to resolve these technical bottlenecks. Combining bi-directional magnetic arc-blowout technology, reinforced silver-alloy contact metallurgy, and precision thermal-magnetic trip calibration, OFA guarantees instantaneous clearance of overloads and short circuits, ensuring system resilience and operational continuity.
Direct current lacks a natural zero-crossing point. When an 80A DC circuit breaker trips under full load or short-circuit fault conditions (up to 10kA–20kA ultimate breaking capacity), the resulting plasma arc can reach temperatures exceeding 4,000°C. Standard AC breakers fail catastrophically in DC applications due to sustained arcing, contact welding, and thermal degradation of insulation materials. Precision-engineered DC breakers incorporate powerful permanent magnets within the arc chute to physically stretch and force the plasma arc into multi-plate quenching chambers.
Over a decade of manufacturing precision, tax credit excellence, and worldwide project fulfillment.
Deep-level engineering specifications designed for long-term stability in high-demand environments.
Integrated high-coercivity permanent magnetic blow-out coils generate an intense Lorentz force that rapidly directs plasma arcs into the arc chute array, quenching dangerous arcs within milliseconds regardless of current direction.
Designed for renewable energy storage systems (BESS) where current flows in dual directions (charging and discharging). Operates seamlessly without requiring directional wiring constraints or polarity derating.
Constructed with high-grade Bulk Molding Compound (BMC) resin offering superior dielectric insulation, high arc resistance, flame retardancy (UL94-V0), and mechanical stability across extreme temperatures (-40°C to +85°C).
Combines a calibrated bimetallic strip for precise inverse-time thermal overload protection with a high-speed electromagnetic coil for instantaneous short-circuit protection (Tripping Curves B, C, K).
Engineered with premium silver cadmium oxide or silver zinc oxide contact points ensuring minimal contact resistance, zero contact welding during fault clearance, and exceptional electrical lifespan exceeding 10,000 operations.
Compact 1P, 2P, 3P, and 4P physical form factors optimized for standard 35mm DIN-rail mounting. Compatible with shunt trips, auxiliary contacts, and remote signaling alarm accessories.
| Parameter | Standard Specification | High-Voltage PV Variant | Industrial ESS Heavy-Duty Variant |
|---|---|---|---|
| Rated Current (In) | 80A | 80A | 80A |
| Rated Operating Voltage (Ue) | 250V DC / 500V DC | 1000V DC | 1250V DC / 1500V DC |
| Number of Poles | 1P, 2P | 2P, 4P (In Series) | 2P, 4P Molded Case (MCCB) |
| Ultimate Breaking Capacity (Icu) | 6kA / 10kA | 10kA / 15kA | 20kA / 25kA |
| Service Breaking Capacity (Ics) | 100% Icu | 100% Icu | 75% - 100% Icu |
| Rated Impulse Withstand (Uimp) | 6 kV | 8 kV | 12 kV |
| Tripping Curve Characteristics | Curve C (7-10 In) | Curve K (10-14 In) | Adjustable Electronic Unit |
| Mechanical / Electrical Life | 20,000 / 8,000 Ops | 15,000 / 6,000 Ops | 10,000 / 4,000 Ops |
| Compliance Standards | IEC 60947-2, GB/T 14048.2 | IEC 60947-2 PV, EN 60947-2 | UL 489B, CE, ISO9001 |
Precision electrical protection integrated into critical energy management and distribution systems worldwide.
Positioned between high-voltage solar string arrays and central or string inverters. Provides reliable 80A isolation to prevent reverse-current faults, lightning surges, and DC busbar short circuits in commercial roof and utility solar farms.
Serves as the primary protective device between lithium-iron-phosphate (LFP) battery racks and power conversion systems (PCS). Designed to handle rapid high-current discharge spikes and bi-directional charge/discharge cycles.
Protects high-power fast-charging pedestals delivering 50kW to 360kW DC power directly to EV battery packs. Prevents insulation failure, over-current damage, and protects sensitive power electronics during fast-charge sequences.
Guards critical cellular base stations, 5G towers, and central server racks backed up by 48V DC battery banks. Ensures unyielding uptime, low voltage-drop performance, and rapid fault isolation without nuisance tripping.
Designed for electric marine propulsion, auxiliary onboard battery networks, and offshore platform power distribution. Resists salt-spray corrosion, continuous vibration, and extreme atmospheric humidity.
Protects industrial overhead cranes, DC servo controllers, conveyor systems, and electroplating equipment against stalled rotor over-currents and line-to-ground short circuits.
Rigorous 100% full-inspection standard operating procedures ensuring zero out-of-factory defect rates.
Wenzhou OFA Electrical Technology Co., Ltd. operates state-of-the-art automated manufacturing lines located in Yueqing, Wenzhou. Quality assurance is integrated into every phase of production—from raw silver contact inspection to automated magnetic arc chute assembly and digital thermal trip calibration.
Automated robotics execute contact rivet pressing, coil winding, and housing ultrasonic welding with sub-millimeter precision, eliminating human error and maintaining tight physical tolerances across millions of units annually.
Equipped with high-current impulse generators, temperature rise test benches, mechanical endurance rigs, and salt spray chambers. Every batch undergoes sample testing to verify breaking capacity (Icu) and thermal curve accuracy.
Certified to ISO9001 Quality Management Systems. OFA has earned tax credit grade A rating for seven consecutive years, testifying to transparent operations, commercial integrity, and long-term financial stability.
Pioneering the evolution from passive circuit tripping to predictive AI power management.
The future of low-voltage and medium-voltage power distribution demands intelligence. OFA's next-generation 80A DC circuit breakers are integrating micro-controller units (MCUs), RS485 Modbus, and wireless IoT communication protocols (Zigbee/LoRa) directly into standard DIN-rail profiles. This enables real-time monitoring of line current, busbar operating temperature, contacts wear status, and insulation degradation.
By transitioning from reactive fault clearing to predictive trip algorithms, power facility operators can prevent catastrophic arc flash events, schedule targeted maintenance, and remotely manage energy distribution across distributed microgrid architectures.
From initial design consultation to high-volume manufacturing and global logistics delivery.
Technical consultation with OFA engineers to analyze application voltage, required breaking capacity, trip curve characteristics, housing dimensions, and terminal connection types (tunnel terminal vs busbar bolt).
Execution of 3D thermal modeling and arc extinction simulations. Rapid delivery of customized prototypes with private label laser branding, custom shell colors, and specialized packaging within 10-15 business days.
Rigorous lab testing against client specifications or target market standards (CE, CB, IEC, UL). Production of full test reports and certification documentation packages for regional import clearance.
Mass manufacturing backed by automated inspection workstations. Automated calibration ensures 100% compliance with inverse-time thermal and magnetic trip thresholds before final sealing.
Heavy-duty export carton packaging, palletizing, and humidity protection. Expedited shipping options via ocean freight, air cargo, or express courier, complete with custom export documentation.
Ongoing technical support, post-sale warranty fulfillment, platform software updates (for smart variants), and continuous efficiency optimization based on site operational data.
See why international system integrators, EPC contractors, and distributors rely on OFA.
Technical Director, Energy Storage Integrator (Poland)
Head of Procurement, Solar EPC Solutions (Germany)
Infrastructure Project Director (Bangkok, Thailand)
Expert answers to critical technical questions regarding 80A DC circuit breaker selection, installation, and compliance.
Alternating current naturally crosses zero voltage twice per cycle (100 or 120 times per second), which breaks the electrical arc automatically. Direct current maintains continuous current flow and voltage potential, generating sustained high-energy electrical arcs when contacts separate. Standard AC breakers lack the permanent magnets, extended arc chutes, and contact gap distance needed to stretch and extinguish DC arcs, leading to melting, fire hazards, or catastrophic failure.
Polarized DC breakers require current to flow strictly from positive to negative terminals (inlet to outlet). If wired backwards, the internal permanent magnets deflect the arc in the wrong direction, bypassing the arc chute and destroying the breaker. Non-polarized 80A DC breakers utilize symmetric magnetic arc blowouts, allowing current to flow in either direction. This is critical for Energy Storage Systems (BESS) where batteries charge and discharge through the same circuit breaker.
Circuit breakers are calibrated to a standard baseline operating temperature of 30°C or 40°C. In high-temperature environments (such as sealed outdoor PV combiner boxes reaching 60°C+), thermal bimetallic strips expand earlier, causing nuisance thermal tripping below the nominal 80A rating. OFA provides detailed temperature derating curves, allowing engineers to size breakers correctly or opt for temperature-compensated electronic trip units.
For the European Union, CE marking compliant with IEC/EN 60947-2 (Low-voltage switchgear - Circuit-breakers) or IEC 60947-2 Annex PV is required. For North America, compliance with UL 489 (Molded-Case Circuit Breakers) or UL 489B (Circuit Breakers for Use in Photovoltaic Systems) is mandatory. OFA provides complete test report documentation supporting global access.
OFA provides end-to-end OEM/ODM services including customized trip curve calibration (Curves B, C, D, K), customized terminal block geometries, private label laser printing, shell color matching, custom voltage ratings (up to 1500V DC), and pre-wired auxiliary/shunt trip accessory integration.
Connecting multiple poles in series (e.g., 2-pole or 4-pole configurations) effectively multiplies the total arc gap distance and arc chute capacity. For example, a single pole rated for 250V DC arc suppression, when wired in series across 4 poles, can safely interrupt up to 1000V DC (250V x 4 = 1000V DC), expanding system rating without requiring massive physical redesigns.
Explore our extensive range of high-performance MCBs, MCCBs, ACBs, RCCBs, RCBOs, and Isolators.
OFA Electrical
