Explore our engineered portfolio of low-voltage breakers, molded case switchgears, and residual current protection devices custom-manufactured for global OEM clients.
As the global energy transition accelerates from traditional alternating current (AC) power distribution to localized, high-density direct current (DC) microgrids, the role of specialized DC circuit breakers has shifted from auxiliary hardware to critical system safeguards.
Unlike AC circuits where voltage crosses zero 100 or 120 times per second—allowing natural arc extinction—DC current maintains continuous electron flow. A 50 Amp DC breaker must artificially generate an arc voltage higher than the operational system voltage to rapidly extinguish high-energy DC arcs during short-circuit faults.
50A DC breakers feature specially calibrated bimetallic strips and magnetic trip coils. The thermal unit provides inverse-time delay protection against continuous overloads, while the electromagnetic element delivers instantaneous tripping within milliseconds upon sensing fault currents up to 10kA or 20kA.
Modern energy storage systems (BESS) require bi-directional power flow during charge and discharge cycles. Engineering a 50 Amp DC circuit breaker with permanent magnet arc-blowout capabilities ensures non-polarized protection, eliminating installation direction errors in field deployments.
The global demand for 50 Amp DC circuit breakers is expanding rapidly beyond traditional telecommunications backup power into high-growth clean energy sectors. Electrical EPC contractors, OEM equipment builders, and distribution partners prioritize four core engineering criteria during global sourcing:
The market for low-voltage DC protection devices is projected to maintain a Compound Annual Growth Rate (CAGR) exceeding 9.4% over the next decade. Strategic drivers include:
Wenzhou OFA Electrical Technology Co., Ltd. combines a decade of specialized R&D with Yueqing’s world-class electrical industrial cluster to deliver unmatched OEM manufacturing precision.
Our smart manufacturing lines utilize digital inspection stations and automated spot-welding robotics. Every 50A DC breaker unit undergoes automated thermal-magnetic trip calibration to guarantee exact trip curve compliance.
Operating under strict ISO9001 quality management standards, we enforce 100% full-inspection SOPs covering insulation resistance, temperature rise limits, dielectric strength, and short-circuit withstand capacity.
Situated in Wenzhou—the Capital of Electrical Appliances in China—we leverage vertical supply chain integration for raw materials, copper contacts, and molded housings to reduce lead times and buffer global logistics volatility.
Comparative parameter matrix across our flagship industrial DC MCB and MCCB series engineered for OEM deployment.
| Specification Parameter | OFD4Z7 Series (DC MCB) | OFID Series (DC MCCB) | OF1-250/PV Series |
|---|---|---|---|
| Rated Current (In) | 50 Amp (1A – 63A range) | 50 Amp (16A – 250A range) | 50 Amp (50A – 250A range) |
| Rated Voltage (Ue) | 12V DC – 500V DC (1P/2P) | 250V DC – 1000V DC | 500V DC – 1500V DC |
| Poles Configuration | 1P, 2P, 3P, 4P | 2P, 3P, 4P | 2P, 4P (Solar Dedicated) |
| Breaking Capacity (Icu) | 6kA / 10kA | 15kA / 25kA | 20kA / 35kA |
| Tripping Characteristic | C Curve (5-10In) / D Curve (10-14In) | Adjustable Thermal-Magnetic | Fixed Solar Protection Curve |
| Arc Extinction Technology | Permanent Magnet Arc Blowout | Multi-Plate Arc Chute + Magnet | De-ion Arc Chamber System |
| Operating Temperature | -35°C to +70°C | -40°C to +75°C | -40°C to +85°C |
| Standards Compliance | IEC 60947-2, GB/T 14048.2 | IEC 60947-2, UL 489B | IEC 60947-2, CE, RoHS |
Engineered for robust protection across mission-critical renewable and industrial DC environments worldwide.
Protects DC string arrays against back-feed reverse currents and overcurrent faults in residential rooftop and utility-scale solar farms.
Serves as primary isolation and short-circuit protection between LiFePO4 battery racks, inverters, and battery management systems (BMS).
Installed within DC fast-charging stations to protect auxiliary rectifiers, control circuits, and power conversion modules.
Provides dedicated -48V DC overcurrent protection for cell tower base transceiver stations, marine battery banks, and off-grid power systems.
Wenzhou OFA Electrical Technology Co., Ltd., rooted in Yueqing for over a decade (founded in 2013), has been providing global partners with distribution switchgear, control equipment, and supporting protection devices that feature rock-solid performance and structural cost advantages. Operating under the independent brand "OFA", our solution footprint spans power generation, renewable energy, industrial automation, commercial construction, and equipment manufacturing.
We adhere to transparent operations, having been rated as tax credit grade A for seven consecutive years, earning long-term trust from EPC partners and OEM brands across 50+ countries.
From initial engineering consultation to mass production and global delivery.
Comprehensive review of voltage levels, trip curves, thermal limits, and physical enclosures tailored to your target application.
Rapid prototyping, custom logo laser etching, and laboratory type-testing (thermal rise, mechanical endurance, dielectric strength).
Automated assembly under ISO9001 standards with full-process quality checkpoints minimizing out-of-factory defect rates.
Secure export packaging, full compliance documentation (CE, IEC), and long-term lifecycle technical support.
Engineering and procurement insights regarding 50 Amp DC Circuit Breakers and OEM partnership models.
Discover our extended line of MCBs, MCCBs, RCBOs, and isolation switches designed for high-reliability electrical automation.
Partner with Wenzhou OFA Electrical Technology Co., Ltd. for cost-effective, high-reliability 50 Amp DC Circuit Breakers and custom OEM/ODM solutions.
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