Industrial-grade miniature circuit breakers engineered for high-breaking capacity across mission-critical power distribution environments.
In-depth analysis of high-breaking capacity miniature circuit breakers engineered for critical low-voltage power distribution networks.
In modern industrial automation, commercial real estate, data centers, and renewable energy storage infrastructures, electrical distribution networks require absolute operational stability and extreme fault-isolation capabilities. The OF10KA C65 Series Miniature Circuit Breaker (MCB) represents the pinnacle of modern circuit protection technology, designed specifically to safeguard electrical installations against severe overloads and catastrophic short-circuit currents up to 10,000 Amperes (10kA) according to IEC/EN 60898-1 and IEC/EN 60947-2 standards.
Wenzhou OFA Electrical Technology Co., Ltd., operating from the global low-voltage electrical capital of Yueqing, Wenzhou, has engineered the OF10KA C65 Series to set a new benchmark for structural durability, contact longevity, and modular compatibility. The C65 footprint standard seamlessly retrofits into standard DIN-rail distribution boards while providing advanced thermal isolation and zero-halogen, flame-retardant polymer enclosure protection.
| Electrical & Mechanical Parameters | Technical Specification Value | Compliance Standard |
|---|---|---|
| Rated Current ($I_n$) | 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | IEC/EN 60898-1 |
| Poles Configuration | 1P, 2P, 3P, 4P, 1P+N, 3P+N | DIN 43880 Standard Footprint |
| Short-Circuit Breaking Capacity ($I_{cn}$) | 10,000 A (10kA) at 240/415V AC | IEC 60898-1 / EN 60898-1 |
| Service Short-Circuit Capacity ($I_{cs}$) | 100% $I_{cn}$ (10kA continuously verified) | IEC 60947-2 Category A |
| Instantaneous Tripping Curves | Type B (3-5 $I_n$), Type C (5-10 $I_n$), Type D (10-14 $I_n$) | Industrial & Commercial Selectivity |
| Rated Insulation Voltage ($U_i$) | 500V AC (Phase to Phase) | Pollution Degree 3 |
| Rated Impulse Withstand Voltage ($U_{imp}$) | 6 kV (1.2/50 $\mu$s wave surge isolation) | Overvoltage Category III / IV |
| Mechanical & Electrical Endurance | 20,000 Operations Mechanical / 10,000 Operations Electrical | ISO 9001 SOP Verification |
| Enclosure Protection Class & Material | IP20 (IP40 inside distribution panel), V-0 Flame Retardant PA66 | UL94 V-0 Flammability Standard |
How the OF10KA C65 Series achieves ultra-fast arc displacement and minimal contact erosion under maximum fault current conditions.
The arc chute comprises 12 nickel-plated steel splitter plates that rapidly divide the high-voltage electric arc into micro-arcs, cooling the plasma within 2.5 milliseconds and accelerating extinction.
Formulated with micro-alloyed silver-graphite matrix, the primary contacts resist contact welding under heavy current spikes up to 10kA while maintaining low contact resistance across thousands of operational cycles.
Integrates calibrated thermostatic bimetal strips for precise inverse-time thermal overload protection alongside solenoid-driven instantaneous magnetic tripping for short-circuit faults.
Leveraging Yueqing’s world-class electrical industrial cluster to deliver unmatched cost efficiency, precision manufacturing, and rapid global fulfillment.
Wenzhou OFA Electrical Technology Co., Ltd. is strategically situated in Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China. Operating in the heart of the world’s most dense and sophisticated low-voltage component ecosystem provides OFA with unmatched competitive advantages in raw material sourcing, automated tooling design, and scalable production agility.
Since our founding in 2013, OFA has developed a fully integrated supply chain model covering every stage of breaker manufacturing: from precision copper stamping, contact welding, and automated coil winding to plastic injection molding and digital testing verification.
By producing over 85% of critical internal sub-assemblies in-house, OFA eliminates supply chain bottlenecks and maintains tight control over physical tolerances, spring tension calibration, and material purity.
Every single OF10KA C65 circuit breaker undergoes automated end-of-line functional testing, verifying instant tripping currents, contact resistance, and thermal time-delay response under load before batch dispatch.
OFA has been officially rated as a Tax Credit Grade A Enterprise for seven consecutive years in China, demonstrating absolute corporate stability, compliance, and long-term financial integrity for overseas buyers.
With an experienced manufacturing workforce of 96+ specialists and state-of-the-art semi-automated assembly lines, OFA stably handles multi-container commercial orders and fast-track project deliveries.
Engineered to protect critical power infrastructure across extreme environmental and operational conditions worldwide.
Safeguards AC output side of string inverters and battery energy storage system (BESS) sub-distribution sub-panels against severe current spikes and reverse power flow faults.
Protects commercial Level 2 and Level 3 DC fast charger auxiliary control cabinets against short circuits, preventing costly downtime and equipment damage.
Serves as the frontline protection element inside Server Rack Power Distribution Units (PDUs) and uninterruptible power supply (UPS) distribution frames, maintaining system uptime.
Provides selective motor branch circuit protection (Curve D) for heavy inductive loads, high startup surge pumps, conveyor drives, and CNC machine panels.
Integrated into floor-level lighting control switchboards, HVAC energy management systems, and public facility sub-panels to ensure human and structural safety.
Meeting global grid entry requirements through comprehensive type-testing and continuous quality management.
International electrical markets require strict adherence to safety standards and environmental regulations. OFA’s manufacturing base operates under a comprehensive ISO9001:2015 Quality Management System. Every production batch of the OF10KA C65 Series undergoes rigorous full-process type testing in verified laboratory environments.
Fully compliant with European Norms for household and similar low-voltage electrical installations, guaranteeing 10kA breaking capacity under 230V/400V 50/60Hz grids.
Engineered to meet industrial circuit breaker requirements, enabling continuous duty cycles under severe ambient temperatures ranging from -35°C up to +70°C.
Constructed using non-hazardous, heavy-metal-free raw materials, ensuring full compliance with EU environmental directives and green building standards.
Pioneering the evolution from passive overload tripping to predictive energy management and smart grid telemetry.
As power systems transition toward digitized, decentralized smart microgrids, low-voltage protection devices must evolve beyond basic mechanical interruption. Wenzhou OFA Electrical Technology Co., Ltd. is actively expanding the OF10KA C65 architecture into the next generation of smart power distribution equipment.
Modular snap-on alarm switch (OF-AX) and shunt trip (OF-SH) accessories enable real-time contact status telemetry and remote electrical tripping from centralized SCADA systems.
Upcoming smart variants feature integrated RS485 / Modbus-RTU micro-modules for real-time current metering, terminal temperature monitoring, and predictive failure alerts.
R&D efforts target hybrid semiconductor-mechanical interruption technology to achieve sub-millisecond arc quenching for high-voltage DC and renewable energy circuits.
See why electrical system integrators, plant engineers, and EPC contractors worldwide rely on OFA.
"As a system integrator in Poland, we have collaborated with OFA across numerous industrial automation projects. Their OF10KA C65 series breaker range is remarkably consistent. The 10kA breaking rating provides the exact safety margins required by strict European site specifications."
"We upgraded our manufacturing workshop's sub-panels with OFA's miniature circuit breakers and residual current units. The installation on standard DIN rails was seamless, and the electrical stability over the past 24 months has been flawless. OFA is our go-to OEM partner."
Clear, direct answers regarding specifications, OEM options, logistics, and factory capabilities.
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