Precision-engineered miniature and molded case circuit breakers designed for high ambient temperatures, rapid arc quenching, and continuous solar grid reliability.
As the global solar utility landscape transitions from 1000V DC to 1500V DC systems, circuit protection components face unprecedented thermal stress, arc suppression demands, and fault-current conditions.
Modern commercial and utility-scale solar arrays leverage higher system voltages to diminish transmission losses and cable costs. However, DC arcs lack a natural zero-crossing point unlike AC power. This requires engineered DC circuit breakers with augmented magnetic blowout chambers, split arc chute plates, and high thermal capacity silver-alloy contact materials to extinguish high-energy DC arcs within milliseconds.
The integration of Battery Energy Storage Systems (BESS) introduces high bidirectional short-circuit prospective currents. OEM solar circuit breakers must provide reliable overcurrent and short-circuit protection capable of handling both solar panel generation feeding into storage and rapid battery discharge back into central inverters or microgrids during peak demand cycles.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou—the world-renowned capital of electrical appliances. Owning independent proprietary brands such as "OFA", our company has established itself as an authoritative leader in low-voltage power distribution switchgear and intelligent control equipment.
Over a decade of pragmatic manufacturing and strict compliance has earned OFA a Tax Credit Grade A rating for seven consecutive years. We operate fully digitized assembly lines, automated calibration benches, and digital inspection stations ensuring every component meets global benchmark standards.
From solar string miniature circuit breakers to heavy-duty intelligent air circuit breakers, OFA manufactures complete circuit protection solutions designed for optimal safety and longevity.
| Product Category | Key Series Models | Technical Characteristics | Primary Solar & Distribution Applications |
|---|---|---|---|
| DC MCB (Miniature) | DCOF1-125/PV, OFDZ47-DC | Rated Voltage up to 1000V/1200V DC; 1P to 4P; In: 1A to 125A; Non-polar protection, fast magnetic trip. | Solar PV Combiner Boxes, Rooftop Inverter DC Inputs, Battery String Protection. |
| DC MCCB (Molded Case) | OF1-125/PV, DCM1-DC, BA88 Series | Rated Voltage to 1500V DC; In: 63A to 630A; Icu up to 25kA; Adjustable thermal-magnetic trip units. | Main DC Distribution Panels, Commercial Inverters, Utility Solar Central Protection. |
| AC MCB & Distribution | OF6KA, OF10KA C65, OFEU, OFKL | Breaking capacity 6kA/10kA; Curve B, C, D; 1P, 2P, 3P, 4P; Compact din-rail modular design. | AC Side Solar Inverter Output, Sub-panel Distribution, Residential & Commercial AC Systems. |
| Earth Leakage (RCBO/RCCB) | OFDPN, NB1L, OFOM, OFID Series | Residual current protection combined with overcurrent; Type A/AC/B residual current detection. | EV Charging Stations, Damp Outdoor Solar Combiners, Personnel Safety Shock Protection. |
| Air Circuit Breakers (ACB) | OFW1 Intelligent Universal Series | In: 630A to 6300A; High short-time withstand current (Icw); Embedded intelligent controller. | Main Low Voltage Switchgear in Utility Solar Power Plants and Industrial Substation Main Frames. |
| Isolator Switches (IS) | OFIS-125A, OFIS-DS Series | Safe physical isolation under load; Compact modular design; High endurance contact structure. | Solar Inverter Maintenance Disconnect, Emergency Cutoff Switches, Isolation Panels. |
Equipped with bimetallic thermal elements for inverse time-delay overload protection and instantaneous electromagnetic armatures for high-energy fault currents, ensuring selective tripping across multi-stage distribution networks.
Incorporates localized permanent magnets to physically stretch and force the electric arc into multi-grid arc splitter plates. This rapidly elevates arc voltage above system voltage to safely extinguish direct current arcs.
V0 grade flame-retardant thermoplastics, silver-tin-oxide contacts resisting welding under high inrush currents, and ambient temperature compensation spanning -40°C up to +70°C for extreme outdoor enclosure mounting.
OFA solar circuit protection devices are deployed globally in challenging environments ranging from high-altitude desert solar farms to humid coastal battery storage facilities.
Installed inside string combiner boxes and main DC distribution switchboards. OFA DC MCBs and MCCBs safeguard multi-megawatt solar arrays against reverse-current faults caused by shading or panel degradation, mitigating risk of localized thermal damage.
Providing compact modular protection within rapid shutdown systems and string inverters. Designed for easy DIN-rail mounting inside IP65 weather-proof consumer units, ensuring rapid installation and effortless compliance maintenance.
Heavy-duty DC molded case circuit breakers and air circuit breakers protecting lithium-ion battery racks. They prevent dangerous overcurrent surges during rapid charging/discharging phases and isolate battery modules during emergency faults.
Integrating residual current circuit breakers with overcurrent protection (RCBO Type A / Type B) within DC fast charging pedestals to ensure complete shock protection for users and protect internal electronics against grid transients.
Providing intelligent circuit control with auxiliary alarm contacts and shunt trip accessories, allowing remote automated tripping via supervisory control and data acquisition (SCADA) platforms during microgrid islanding.
High breaking capacity AC miniature circuit breakers safeguarding critical power distribution units (PDUs), industrial motor control centers, and automated manufacturing lines against phase-to-phase and phase-to-ground short circuits.
Global energy markets require strict compliance with international electrical standards. OFA switchgear undergoes rigorous testing protocols to meet regional grid codes worldwide.
Our OEM solar breakers and low-voltage distribution components are engineered in alignment with internationally recognized standard specifications:
Solar arrays are frequently constructed in harsh desert environments or elevated altitudes above 2000 meters where low air density reduces cooling efficiency and dielectric strength:
Our housings utilize UV-stabilized, high-impact polycarbonate and polyamide materials capable of enduring extreme thermal cycling from -40°C during cold nights to +70°C inside sealed outdoor combiner boxes under direct solar exposure.
OFA is committing substantial R&D resources toward the digital transformation of electrical switchgear, transitioning from passive protection devices to active predictive smart protection systems.
Embedding RS485 Modbus, Wi-Fi, and Zigbee communication modules directly into miniature circuit breakers to transmit real-time voltage, current, contact temperature, and power consumption telemetry straight to cloud-based SCADA platforms.
Utilizing high-speed microcontrollers to analyze current waveform signature anomalies, detecting micro-arcing phenomena prior to full arc ignition and proactively isolating solar strings before fire hazards manifest.
Pioneering hybrid solid-state semiconductor breaker technology offering interruption speeds measured in microseconds rather than milliseconds, eliminating physical contact erosion and mechanical wear entirely.
From standard power efficiency retrofit components to complex custom-engineered switchgear solutions, OFA delivers end-to-end engineering support.
Ideal for distributors, panel builders, and contractors requiring rapid procurement of proven electrical protection components:
Tailored engineering collaboration designed specifically for inverter manufacturers, combiner box builders, and large EPC contractors:
Discover how system integrators, plant managers, and solar EPCs around the world rely on OFA electrical solutions for mission-critical operations.
"As a system integrator in Poland, we collaborated with OFA on several industrial solar and automation projects. Their product range is comprehensive, covering protective relays, DC breakers, and isolating switches, which greatly simplified our procurement and integration work."
"We deployed OFA's intelligent power monitoring and circuit protection devices to upgrade our plant power distribution. The installation went smoothly, and the devices have operated with zero downtime for over a year under harsh manufacturing conditions."
"Our utility solar project in Chile required highly durable 1000V DC miniature circuit breakers capable of enduring high desert temperatures and intense UV exposure. OFA supplied customized breaker units that met all local compliance checks seamlessly."
Get clear, expert answers regarding solar circuit breaker selection, OEM customization, compliance standards, and logistics.
A: Direct Current (DC) arcs do not have a natural zero-crossing point like Alternating Current (AC) sine waves, making DC arcs extremely difficult to extinguish. DC circuit breakers are engineered with specialized permanent magnetic blowout systems and expanded arc chute chambers to physically stretch and force the electrical arc away from contacts to quench it safely.
A: Yes. OFA specializes in comprehensive OEM/ODM manufacturing. We can customize breaker casing color schemes, laser-etched branding, specific current/voltage trip parameters, custom terminal configurations, and packaging tailored to your brand's market requirements.
A: The selection depends on your solar string open-circuit voltage (Voc) under lowest expected ambient temperature conditions. Residential and light commercial solar installations typically operate up to 1000V DC (protected by models like DCOF1-125/PV), whereas modern utility-scale solar farms utilize 1500V DC architectures (protected by heavy-duty DC MCCBs like OF1-125/PV) to maximize efficiency.
A: OFA operates under an ISO9001 certified quality management system. Our core products are manufactured in compliance with international standard IEC/EN 60947-2 and IEC 60898-1, carrying CE certification. Furthermore, OFA has maintained a Grade A Tax Credit rating in China for seven consecutive years, demonstrating our corporate reliability.
A: Standard stocked circuit breakers ship within 7 to 15 business days. Customized OEM batch orders generally take 25 to 35 days depending on standard tooling requirements. We provide flexible FOB, CIF, or DDP logistics via sea, air, or express freight with complete export documentation.
Select from high-performance MCBs, MCCBs, RCCBs, and isolating switches engineered for reliable low-voltage power automation.
OFA Electrical
