Explore our high-performance electrical distribution gear manufactured under rigorous ISO9001 and IEC standards.
A deep dive into direct current physics, magnetic blowout technology, and system-level thermal management.
Unlike Alternating Current (AC) electrical systems that pass through a zero-crossing point 100 or 120 times per second—allowing natural arc extinguishing—Direct Current (DC) maintains a continuous voltage and current flow. Interrupting a high-capacity 150 Amp DC load at 500V, 1000V, or 1500V DC requires specialized arc-chute geometry.
Our 150 Amp DC Circuit Breakers utilize permanent magnetic blowout coils and multi-plate arc splitter chutes to stretch, cool, and rapidly extinguish severe DC arcs in milliseconds, safeguarding critical equipment against destructive electrical fires.
Precision tripping response is crucial for modern high-density power architectures. The 150A DC rating represents a critical current threshold where continuous thermal load can induce stress on conductor terminals if contact resistance is uncalibrated.
Our engineering team integrates bimetallic thermal overload elements with adjustable magnetic short-circuit releases. This dual-protection matrix guarantees zero false tripping under high inrush currents while ensuring fast magnetic response within 5 to 10 milliseconds during dead-short conditions.
The internal contacts of a 150 Amp DC breaker must resist high-temperature arc erosion, contact welding, and surface oxidation over thousands of operational cycles. Traditional silver-cadmium oxide (AgCdO) has been replaced by eco-friendly, high-durability Silver Tin Oxide (AgSnO2) alloys.
This metallurgical refinement significantly enhances dielectric breakdown resistance, preserves low contact resistance throughout the mechanical life of 10,000 operations, and complies strictly with global RoHS directives.
Accelerating decarbonization, utility-scale battery energy storage systems, and high-power EV charging infrastructure are driving unprecedented demand for 150A DC overcurrent protection.
As grid-scale energy storage transitions to 1500V DC bus architectures, battery rack protection demands robust, fast-acting circuit breakers rated at 150A to 250A. These breakers serve as the primary defensive line between lithium-ion battery modules and central power conversion systems (PCS).
Our breakers withstand high fault current contributions from low-impedance battery banks, featuring short-circuit breaking capacities up to 25kA/50kA to mitigate catastrophic thermal runaway risks.
Ultra-fast Electric Vehicle Charging (EVSE) infrastructure operating on Combined Charging System (CCS2) and North American Charging Standard (NACS) protocols requires high continuous DC current delivery at elevated voltages.
Deploying reliable 150 Amp DC circuit breakers inside DC fast-charging power cabinets ensures isolation during insulation faults, protecting high-voltage power modules, liquid-cooled cables, and vehicle electronics.
Solar arrays continue to increase string capacity and system operating voltages. The 150A DC breaker is widely specified in DC combiner boxes and string inverters to isolate multiple parallel PV strings.
Design features such as non-polarity sensitivity, UV-resistant enclosures, and stable operation across extreme ambient temperatures (-40°C to +70°C) ensure uninterrupted yield over a 25-year solar plant lifespan.
Next-generation data centers, telecommunications base stations, and isolated microgrids are rapidly replacing legacy AC distribution with direct 380V/480V DC buses to eliminate double-conversion losses. 150A DC protection components form the core backbone of these modern, energy-efficient power networks.
Professional Manufacturer from the Capital of Electrical Appliances in China.
Founded in 2013 and rooted in Yueqing, Wenzhou—the heart of China’s low-voltage electrical cluster—Wenzhou OFA Electrical Technology Co., Ltd. specializes in the R&D, manufacturing, and sales of distribution switchgear, control equipment, and supporting accessories. We own independent brand identities such as "OFA", serving global power, energy, industrial automation, construction, and equipment manufacturing sectors.
We adhere to honest, law-abiding operations and have been rated as tax credit grade A for seven consecutive years, earning the long-term trust of international EPC contractors, OEM equipment manufacturers, and regional distributors. With 96+ skilled workers and state-of-the-art testing facilities, we deliver scalable solutions without compromising quality.
Our technical team continues to delve deep into the R&D and improvement of distribution switchgear and control equipment, equipped with full-process type testing and factory inspection devices for mechanical life, temperature rise, and dielectric verification.
Through flexible production combining standardization and custom OEM/ODM options, we precisely match client specifications and provide highly competitive factory-direct pricing across full product lifecycles.
We have introduced automated assembly lines and digital inspection stations, ensuring every step from electrical contact stamping to final calibration operates under strict in-process quality control.
Our products meet rigorous international market access standards (CE, IEC, CCC) and have successfully served power projects in over 50 countries across Europe, South America, and Asia.
Engineered to protect critical infrastructure across industrial, commercial, and green energy sectors.
Compact, highly reliable Miniature Circuit Breakers (MCB) and Residual Current Breakers with Overcurrent (RCBO) designed for residential panels, smart home automation, and distributed solar installations.
Heavy-duty Molded Case Circuit Breakers (MCCB) and Air Circuit Breakers (ACB) designed to manage complex building power grids, emergency backup gensets, and HVAC control units.
Intelligent protection devices integrated into DCS and SCADA networks, providing real-time trip diagnostics, auxiliary status signaling, and isolated motor branch protection.
High-voltage DC breakers (1000V/1500V DC) tailored for PV string protection, central inverter DC input cabinets, and commercial battery storage containers.
Fast-acting DC isolating breakers optimized for battery banks delivering critical backup power during mains failure without voltage dip risk.
Robust waterproof outdoor circuit protection (IP65 enclosure compatible) engineered for public EV charging hubs, transit signaling, and municipal smart street lighting systems.
Original factory equipment engineered for system-wide protection and seamless integration.
Molded Case Circuit Breakers maintain primary protection for breaking currents under normal and abnormal fault conditions like overloads and severe short circuits.
Space-saving DIN-rail mounted protection devices engineered for modern sub-distribution boards and machine panels.
Complete earth leakage, personal protection, and high-dielectric disconnect isolating solutions.
Pioneering the transition toward solid-state circuit protection, smart IoT diagnostics, and ultra-high voltage DC grid integration.
Mastering multi-pole series arc chutes to achieve 1500V DC rated isolation within compact MCCB frames. Enhancing contact silver alloy density to maintain temperature rise <45K at 100% continuous 150A load.
Integrating micro-sensors directly within 150A DC breaker frames to measure contact temperature, trip counts, and real-time load profile data. Seamless interface with solar SCADA and microgrid BMS platforms.
Combining Silicon Carbide (SiC) power semiconductors with mechanical contactors. Achieving ultra-fast arc-free interruption in under 10 microseconds, revolutionizing fault protection for AI data centers and MW charging hubs.
From initial technical matching to agile factory production and global site delivery.
Ideal for: Rapid procurement, commercial building retrofits, standard PV combiner boxes.
Ideal for: Large-scale equipment manufacturers, BESS container integrators, military/marine contracts.
See why global industry leaders rely on OFA for their electrical distribution systems.
“We purchased OFA's intelligent power monitoring devices to upgrade the power distribution system in our old workshop. The installation was simpler than expected. Most importantly, they have been running very stably for over a year, and the electricity data provided helped us identify energy consumption anomalies.”
Maintenance Manager, Manufacturing Plant (Germany)
“Deploying OFA's energy efficiency management system for several office buildings we manage was a wise decision. The system helped us gain detailed insights into electricity usage in different areas. Their online support team is responsive and effectively answers our technical questions.”
Facilities Supervisor, Commercial Property (Bangkok, Thailand)
“Our PV project required reliable communication management and data acquisition equipment. OFA's products met our core needs at a reasonable price and adapted well to our local outdoor environment. Their engineers provided excellent configuration guidance.”
Site Engineer, Solar Power Plant (Chile)
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