Explore our certified range of molded case circuit breakers, miniature circuit breakers, and specialized DC isolation devices designed for high-availability systems.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is one of the premier professional suppliers of distribution switchgear, direct current (DC) protection gear, and control equipment in China. Rooted in Yueqing, Wenzhou—universally recognized as the "Capital of Electrical Appliances in China"—OFA has engineered an industrial ecosystem driving continuous progress in power distribution and control technology.
Owning independent top-tier brands such as "OFA", our structural portfolio encompasses critical low-voltage protection, intelligent energy management, industrial automation switches, and commercial microgrid components. Rooted in Yueqing for over a decade, we provide engineering partners worldwide with distribution switchgear and control equipment that feature ironclad thermal stability, exceptional short-circuit interrupting capabilities, and unparalleled cost-to-performance advantages.
The rapid global migration toward renewable electrification, high-density energy storage, and ultra-fast DC fast-charging infrastructure has fundamentally expanded the market requirement for specialized 100A DC Circuit Breakers. Unlike legacy AC protection devices, continuous direct current generates unbroken electrical arcs during contact separation due to the absence of periodic sinusoidal zero-crossing points. Consequently, global system integrators and EPC contractors demand highly tailored, robust protection equipment engineered specifically for high DC voltage stress.
Modern utility-scale and commercial solar arrays demand 100A DC breakers capable of sustaining system voltages up to 1000V DC and 1500V DC. Procurement standards mandate bi-directional current isolation, UV-resistant enclosures, and zero thermal derating at high ambient temperatures.
Containerized Lithium-ion and LFP battery systems require 100A DC protection units with exceptional prospective short-circuit breaking capacity ($I_{cu}$). Rapid arc quenching prevents thermal runaway hazards across rack-level sub-distribution units.
Commercial Level-3 ultra-fast EV chargers deploy 100A DC breakers inside internal distribution panels to safeguard power conversion modules, requiring long electrical endurance under repetitive switching dynamic loads.
Designing a resilient 100A DC Circuit Breaker requires advanced multi-physics simulation involving electromagnetic arc stretch, Lorentz-force movement, and thermal plasma dissipation. OFA's R&D framework focuses on three non-negotiable engineering pillars:
DC arcs do not self-extinguish at zero current crossings. OFA 100A DC units feature permanent magnetic blowout plates that generate a powerful transverse magnetic field. This force pushes the electric arc instantly into splitter plates, fragmenting and cooling the plasma within milliseconds.
Continuous operation at a 100A nominal rating demands zero contact degradation. We utilize high-percentage AgCdO/AgSnO2 alloy contacts delivering exceptionally low contact resistance, mitigating temperature rise under full-load operation in ambient environments reaching up to +70°C.
Modern microgrids experience bi-directional power flows during battery charge/discharge cycles. OFA's non-polar DC breakers operate reliably regardless of current vector direction, removing human installation error risks across complex BESS wiring setups.
| Performance Specification | Miniature DC Breaker (MCB Type) | Molded Case DC Breaker (MCCB Type) | OFA Heavy-Duty 100A DC Standard |
|---|---|---|---|
| Rated Current ($I_n$) | 1A – 63A | 100A – 1250A | 100A Continuous Full-Load |
| Rated Operational Voltage ($U_e$) | 12V DC – 500V DC | 250V DC – 1500V DC | Up to 1000V DC / 1500V DC Multi-Pole |
| Ultimate Short-Circuit Capacity ($I_{cu}$) | 6kA – 10kA | 15kA – 100kA | 20kA – 50kA (Engineered High-Breaking) |
| Trip Unit Technology | Thermal-Magnetic Fixed | Thermal-Magnetic / Electronic | Precision Calibrated Dual-Bimetal |
| Mechanical / Electrical Life | 8,000 / 1,500 Cycles | 15,000 / 4,000 Cycles | 20,000 / 5,000 Cycles Minimum |
Wenzhou OFA Electrical Technology Co., Ltd. does not simply supply individual protection hardware; we deliver systematic expertise. Our 100A DC equipment integrates directly into complex industrial architectures across multi-sector applications.
Modern green data centers transitioning to 380V HVDC distribution leverage OFA 100A DC protection devices between modular power supplies and server rack PDUs, delivering low internal power loss and fast fault isolation during short-circuit transients.
Remote cellular tower installations powered by combined solar-diesel-battery setups rely on our ruggedized 100A DC breakers to handle harsh outdoor ambient swings while guaranteeing uninterrupted telecom network uptime.
As a holistic provider of low-voltage and DC switchgear, OFA manufactures a wide range of complementary circuit components designed for complete installation integrity:
Complete series including BA88 Electronic, DCM1, DCOF1, OFM1, OFBLT, OF1, and OFA-M1 designed for severe overcurrent protection up to 630A and 1250A.
High-reliability modular units comprising OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFL7, OFL8, OFNC, OFPF, and OFP series.
OFW1 Intelligent Universal Circuit Breakers acting as heavy-duty main incoming breakers for low-voltage power distribution networks.
Residual current protection (OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFPM, OFC, NB1L) and Isolator Switches (OFIS-125A, OFIS-BH, OFIS-DS).
Quality is our non-negotiable bottom line. Wenzhou OFA Electrical Technology Co., Ltd. strictly executes a 100% full-inspection standard operating procedure (SOP) across every manufacturing phase. Rooted in an ISO9001 certified quality management system, our dynamic assembly lines combine digital inspection stations with automated testing jigs.
Thermal-magnetic trip curves are 100% calibrated using computerized current sources, ensuring precise trip times under 1.05x, 1.30x, and 5x nominal current ($I_n$) overload conditions.
Every batch undergoes rigorous high-voltage impulse insulation withstand verification, validating clearance and creepage distance standards mandated by IEC 60947-2.
From raw silver contact pads to incoming thermostatic bimetal strips, all material lots are linked via digital MES serial tracking, minimizing out-of-factory defects.
Navigating global power distribution markets requires strict adherence to regional safety frameworks. OFA products are engineered to conform fully to top-tier international standards, facilitating seamless project sign-off for EPC contractors worldwide:
Low-voltage switchgear specification for industrial protection units, governing rated operational voltages, dielectric withstand, and short-circuit interrupting capacities.
Specialized protection criteria for photovoltaic DC molded-case components, ensuring compliance across North American and European solar infrastructure projects.
China Compulsory Certificate compliance alongside continuous quality system management, delivering audited operational reliability.
Discover why system integrators, EPC engineers, and plant operations managers worldwide rely on Wenzhou OFA Electrical Technology Co., Ltd. for critical power automation:
"Deploying OFA's high-capacity DC circuit breakers across our solar storage sub-panels in Chile resolved recurring false-tripping issues caused by ambient temperature spikes. Their technical team guided product selection flawlessly via online remote support."
"As a European industrial system integrator, sourcing consistent breaker units with precise trip curves is critical. OFA's OEM/ODM capabilities and clear technical documentation reduced our on-site commissioning times significantly."
"We installed OFA power monitoring and DC isolation switchgear in our plant retrofits over a year ago. Operating stability has been 100%, and their competitive factory-direct pricing lowered overall BOM costs."
Clear, authoritative responses to critical engineering, procurement, and technical design questions regarding 100A DC protection gear.
Browse additional high-performance miniature circuit breakers, specialized solar DC MCCBs, and protective switchgear engineered by OFA.
Partnering with Wenzhou OFA Electrical Technology Co., Ltd. is designed to be streamlined, transparent, and engineering-driven. Whether you require standard catalogue 100A DC breakers or custom switchgear integration, our process ensures zero friction:
Submit your single-line diagrams (SLD) or product specs. Our electrical engineering team reviews system parameters (voltage, short-circuit withstand, ambient ranges) to match optimal equipment.
We provide detailed, transparent line-item pricing alongside CAD dimension drawings. For custom OEM/ODM projects, sample prototypes undergo rigorous laboratory verification prior to mass production.
Orders enter automated manufacturing under strict ISO9001 SOP control. Final goods undergo full dielectric and trip calibration testing before export packaging and dispatch.
OFA Electrical
