Explore our high-performance Molded Case Circuit Breakers, RCBOs, and protection switchgear engineered for severe industrial duty cycles.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China. Operating under proprietary brands such as "OFA", the company has grown into an authoritative OEM/ODM manufacturer specializing in low-voltage distribution switchgear, industrial automation components, and green energy control equipment.
Upholding a culture of engineering rigor and operational transparency, OFA has been rated as a Tax Credit Grade A Enterprise for seven consecutive years. With certified compliance under ISO9001 quality management standards, OFA combines full-process type testing with precise digital manufacturing to serve EPC contractors, electrical panel builders, and industrial distributors in more than 50 countries.
The MCCB DCM1 Series represents a technological evolution in molded case circuit breakers. Engineered to isolate circuits under overload and severe short-circuit conditions, the DCM1 range integrates advanced arc-extinguishing chute design, superior thermal-magnetic trip units, and high breaking capacity rating up to 100kA (Icu).
Molded Case Circuit Breakers (MCCBs) serve as critical defense nodes within modern low-voltage distribution networks. The DCM1 Series developed by Wenzhou OFA Electrical Technology Co., Ltd. is designed in full compliance with international standards IEC/EN 60947-2 and GB/T 14048.2.
During high-current fault interruptions, electric arcs can reach temperatures above 6,000K. The DCM1 Series utilizes a multi-grid splitter plate assembly manufactured from high-purity magnetic steel. The arc is dynamically driven into the arc chute via electromagnetic forces, cooling and deionizing the arc plasma in milliseconds to prevent re-ignition and switchgear catastrophic damage.
The DCM1 family offers dual thermal-magnetic and electronic trip unit (ETU) topologies. The inverse time thermal bimetallic strip provides precise protection against sustained small overloads, while the electromagnetic instantaneous trip element trips under severe short circuits within 10ms, safeguarding transformer loops and downstream motor systems.
Constructed with unsaturated polyester BMC/DMC high-temperature flame-retardant molding materials, the DCM1 frame offers exceptional dielectrical strength and impact toughness. Designed for over 10,000 mechanical operations and 2,000 electrical operations under full load, it ensures extended service life even under high-humidity and corrosive industrial ambient conditions.
| Frame Size / Model | Rated Current ($I_n$) Range | Poles (P) | Rated Insulation Voltage ($U_i$) | Ultimate Breaking Cap. ($I_{cu}$) @ 400V | Service Breaking Cap. ($I_{cs}$) @ 400V | Trip Unit Technology |
|---|---|---|---|---|---|---|
| DCM1-63 Frame | 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | 1P, 2P, 3P, 4P | 800V AC | 25kA - 35kA | 75% $I_{cu}$ | Thermal-Magnetic Fixed |
| DCM1-125 Frame | 16A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A | 1P, 2P, 3P, 4P | 800V AC | 35kA - 50kA | 100% $I_{cs}$ Option | Thermal-Magnetic / Adj. Instantaneous |
| DCM1-250 Frame | 125A, 140A, 160A, 180A, 200A, 225A, 250A | 3P, 4P | 800V / 1000V | 50kA - 65kA | 100% $I_{cs}$ | Adjustable Thermal-Magnetic / ETU |
| DCM1-400 Frame | 250A, 315A, 350A, 400A | 3P, 4P | 1000V AC | 65kA - 85kA | 100% $I_{cs}$ | Microprocessor Electronic Trip Unit |
| DCM1-630 Frame | 400A, 500A, 630A | 3P, 4P | 1000V AC | 70kA - 100kA | 100% $I_{cs}$ | Microprocessor LSI + IoT Comm. Module |
Global industrial decarbonization, expanding hyperscale data hubs, and the proliferation of renewable grid ties require robust circuit breaker hardware. OFA delivers integrated protection solutions matching specific sector challenges.
Photovoltaic arrays and battery systems experience continuous high DC currents and potential reverse-feed fault dynamics. The DCM1/PV & DCOF1 DC Molded Case Circuit Breaker series provides high voltage ratings up to DC 1500V. Featuring polarized magnetic arc blow-out systems, these breakers safely isolate string inverters and energy storage switchboards.
Factory automation lines subject distribution switchgear to direct-on-line motor starts, inrush currents, and severe harmonic distortion. DCM1 units fitted with motor-protection characteristics (Type M) absorb severe magnetizing current spikes without nuisance tripping, guaranteeing continuous plant productivity.
Uninterrupted uptime is mandatory for cloud servers and telecommunications. DCM1 electronic trip breakers provide full selective coordination (discrimination). In the event of a branch short circuit, only the immediate downstream DCM1 breaker trips, preventing upstream master ACB trip and keeping main servers online.
High-power DC fast chargers (150kW–480kW) present rapid load fluctuations and potential DC ground leakage currents. Integrating DCM1 MCCBs with OFA’s OFID DC Residual Current Circuit Breakers delivers dual overcurrent and smooth DC ground fault defense required by IEC 61851-23 charging standards.
Modern commercial high-rises rely on dynamic energy monitoring. DCM1 MCCBs can be customized with shunt releases, auxiliary contacts, and Modbus-RTU RS485 communication modules, giving building management systems (BMS) live operational telemetry and remote trip control.
Wenzhou OFA Electrical Technology Co., Ltd. continuously invests in R&D to bridge traditional mechanical protection with digital edge intelligence. Our decade-long roadmap focuses on three technological pillars:
Transitioning from reactive protection to predictive maintenance. Future DCM1 iterations integrate micro-MEMS temperature sensors and high-frequency current sampling at 10kHz. Utilizing algorithm-driven wave analysis, the system identifies micro-arcing and contact degradation long before equipment failure occurs.
To meet extreme short-circuit breaking speed requirements in microgrids, OFA engineers are pioneering hybrid SSCB technology. By combining semiconductor SiC/GaN switches with mechanical isolation, breaking times are reduced from 10 milliseconds to sub-millisecond levels ($<1\text{ms}$), eliminating fault energy stress.
In accordance with global ESG directives and EU RoHS/REACH compliance, OFA is replacing legacy halogenated plastics with 100% recyclable bio-based thermoplastics. Production processes incorporate low-carbon silver matrix contact sintering to reduce lifetime environmental footprint.
Procurement directors and engineering buyers face increasing challenges: supply chain volatility, strict local compliance standards, and rising total cost of ownership (TCO). OFA’s structured OEM/ODM manufacturing framework solves these bottlenecks.
Whether you require customized trip current curves, custom brand badging, modular internal accessories (Auxiliary Switch, Alarm Contact, Shunt Release, Undervoltage Release), or specialized enclosure dimensions, OFA provides tailored rapid-prototyping and engineering support.
Every DCM1 unit undergoes automated end-of-line (EOL) verification tests, including dielectric voltage withstand, mechanical operating characteristics, calibration of thermal-magnetic trip curves, and temperature rise verification under nominal current load ($I_n$).
Beyond the flagship DCM1 Series, Wenzhou OFA Electrical Technology Co., Ltd. produces a comprehensive portfolio of low-voltage switchgear components, enabling system integrators to source end-to-end electrical panels from a single reliable manufacturer.
Primary protection for industrial switchboards against high overloads and heavy short circuits.
Final circuit protection for residential, commercial, and control panel auxiliary circuits.
Master incoming protection for low-voltage main distribution boards (MDB).
Life-safety residual earth leakage protection and fire risk mitigation devices.
Safety isolation switches for circuit maintenance and manual power disconnection.
OFA provides system topology verification, short-circuit calculations, custom trip curve matching, and full documentation support for EPC submittals worldwide.
Request Solution EngineeringSee how global engineering leaders rely on Wenzhou OFA Electrical Technology Co., Ltd. for critical power systems.
"As a system integrator in Poland, we collaborated with OFA on multiple heavy manufacturing automation projects. Their product range—from protective relays to DCM1 MCCBs and communication gateways—simplifies our procurement. The product quality is consistent, significantly reducing on-site commissioning delays."
"We deployed OFA's intelligent DCM1 electronic MCCBs and power monitoring devices to retrofit our workshop distribution system in Germany. Installation was seamless, and the units have operated with zero fault downtime for over 18 months under high ambient temperature conditions."
"Deploying OFA energy efficiency management platforms and MCCB protection gear for commercial office complexes in Bangkok was a wise strategic decision. Their online technical support team is highly responsive, aiding our engineering staff through remote commissioning."
"Our utility-scale PV site in Chile required robust DC circuit breakers capable of operating under harsh desert temperature swings and high UV exposure. OFA's DCOF1 and DCM1/PV breakers met all IEC specifications at highly competitive contract pricing."
Find authoritative answers to common engineering, procurement, and installation questions regarding the DCM1 Series Molded Case Circuit Breakers.
Discover our complete range of DC Molded Case Circuit Breakers, Residual Current Breakers with Overcurrent Protection (RCBO), and DIN-rail Miniature Circuit Breakers.
Contact Wenzhou OFA Electrical Technology Co., Ltd. today to discuss custom OEM/ODM manufacturing, request technical submittal packages, or obtain factory-direct wholesale pricing for your next power project.
OFA Electrical
