Explore our certified low-voltage circuit breakers and isolators designed for reliable industrial automation deployment.
Analyzing the paradigm shift toward smart distribution switchgear, digital energy management, and reliable OEM/ODM component sourcing.
Modern manufacturing facilities require non-stop operational continuity. Low-voltage distribution switchgear serves as the neural network of industrial plants, integrating Air Circuit Breakers (ACB), Molded Case Circuit Breakers (MCCB), and Miniature Circuit Breakers (MCB) with advanced telemetry to prevent costly thermal overloads, short-circuits, and phase imbalances.
Global procurement teams face increasing pressures regarding lead times, custom enclosure constraints, and stringent regulatory compliance (IEC/EN 60947, UL 489, CE). Partnering with a vertically integrated OEM manufacturer eliminates multi-tier markups while ensuring total component traceability and standard operating procedures (SOPs) across high-volume orders.
With the exponential growth of distributed solar photovoltaic (PV) arrays, Battery Energy Storage Systems (BESS), and EV fast-charging stations, circuit protection devices must handle bidirectional currents, high DC working voltages (up to 1500V DC), and rapid transient suppression. Specialized DC MCCB and DC MCB architectures are now mandatory for renewable energy panels.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is strategically located in Yueqing, Wenzhou — China’s premier low-voltage electrical apparatus industrial cluster. We specialize in the full spectrum of distribution switchgear, industrial control gear, power monitoring hardware, and bespoke electrical accessories under our flagship proprietary brand "OFA" as well as flexible OEM/ODM manufacturing partnerships.
Recognized for unyielding product integrity, our company has maintained a tax credit grade A for seven consecutive years. Operating under ISO 9001 certified quality management systems, our modern manufacturing facility utilizes automated assembly lines, digital inspection stations, and rigorous type-testing equipment to systematically eliminate out-of-factory defects.
Engineered to handle extreme thermal stresses, high breaking capacities (Icu/Ics), and complex operational environments.
Designed to make, carry, and break currents under normal conditions while isolating abnormal overload and short-circuit faults in heavy commercial & industrial main feeders. Series include BA88 Electronic, DCM1, DCOF1, OFM1, and OFBLT series with working currents up to 630A and breaking capacities reaching 50kA.
Compact, DIN-rail mounted circuit protection for final branch distribution panels. Featuring quick-trip mechanisms, thermal-magnetic trip units, and multiple characteristic curves (B, C, D). Includes OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDZ47, OFEU, OFKL, and OFPF series optimized for residential and commercial circuits.
The core protective brain for low-voltage transformer incoming feeders and high-power industrial sub-stations. The OFW1 Intelligent Universal Circuit Breaker series integrates programmable micro-processor controllers, network communication interfaces (Modbus/RS485), selective protection functions, and real-time energy metering.
High-sensitivity earth leakage current protection designed to prevent lethal electric shocks and electrical fire hazards caused by insulation degradation. Portfolio features OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, and OFPM series providing instant magnetic tripping upon detecting low residual leakage currents.
Innovatively combining thermal overload protection, magnetic short-circuit tripping, and residual earth leakage protection into a single module. The OFC, OFKL-80A, NB1L, OFMIN, OFOM, and OFR1 series maximize enclosure space efficiency while delivering uncompromised circuit safety.
Heavy-duty load isolation switches (OFIS-125A, OFIS-BH, OFIS-DS) paired with dedicated high-voltage DC protection breakers (BLTM3DC-250HU, DCOF1-250/PV) specifically tailored for solar string boxes, energy storage cabinets, and industrial isolation disconnects.
Engineered electrical switchgear optimized for challenging environments and critical operational demands.
Providing modular DIN-rail distribution board solutions utilizing high-reliability MCB and RCBO units to guarantee human contact safety and uninterrupted building power service.
Integrating heavy-duty MCCB units (such as OFM1 and BA88 series) into Motor Control Centers (MCC) to manage high inrush starting currents while providing precise thermal overload trips.
Deploying non-polarized DC circuit breakers like DCOF1-250/PV to isolate up to 1000V/1500V DC strings, effectively snuffing out dangerous DC electric arcs in solar farms.
High-tier UPS output distribution panels demanding selective fault trip coordination (Icu=Ics=100% capacity) to prevent localized ground faults from triggering total server outages.
Fitting high-capacity charging kiosks with dedicated Type B RCCBs and robust Isolator Switches (IS series) to prevent smooth DC leakage currents from blinding safety protection units.
Utilizing smart Air Circuit Breakers (OFW1) for municipal grid synchronization, automatic power transfer systems (ATS), and continuous load management.
From initial technical review to agile mass production and post-delivery lifecycle support.
Our engineering team analyzes your site schematic, voltage level, breaking capacity requirements (kA), and target enclosure dimensions to select or custom-design the optimal product profile.
Utilizing full-process laboratory testing, we verify mechanical endurance, contact resistance, and thermal rise curves on initial engineering samples prior to mass tooling rollout.
Once approved, orders move to automated production lines. 100% full-inspection standard operating procedures are enforced for trip sensitivity, dielectric strength, and calibration.
Secure export packaging, international customs documentation, and long-term remote engineering support ensure seamless integration into your local installation projects.
See why global system integrators and plant operators rely on OFA for low-voltage power safety.
In-depth technical and commercial answers regarding our industrial automation OEM/ODM capabilities.
OFA combines deep vertical integration in China's electrical capital (Yueqing, Wenzhou) with over 13 years of engineering expertise. Unlike mere trading companies, we operate full manufacturing and quality inspection lines certified under ISO 9001. We provide system-level expertise, deep custom development (OEM/ODM), transparent compliance documentation (CE, IEC, CCC), and strict 100% factory routine testing before dispatch.
MCB (Miniature Circuit Breaker): Typically rated up to 125A, used for final branch circuit protection with low to medium breaking capacity (6kA to 10kA).
MCCB (Molded Case Circuit Breaker): Handles higher operating currents (10A to 1600A) with adjustable thermal-magnetic or electronic trip units and higher breaking capacity (up to 50kA or more), ideal for industrial main sub-feeders.
ACB (Air Circuit Breaker): Main switchboard protector rated up to 6300A, featuring high short-time withstand current (Icw) ratings, intelligent micro-processor trip units, and digital communication capabilities for main power entry panels.
An RCBO integrates overload, short-circuit, and residual earth leakage protection into a single unified housing. This eliminates interconnecting wiring errors between separate devices, saves up to 50% of DIN-rail space inside control enclosures, and ensures pinpoint circuit fault diagnosis (isolating earth leakage on individual branch circuits without tripping unaffected parallel circuits).
Yes. Direct Current (DC) arcs do not experience natural zero-crossing points like AC arcs, making them significantly harder to extinguish. OFA manufactures dedicated high-voltage DC Molded Case Circuit Breakers (e.g., BLTM3DC-250HU and DCOF1-250/PV) equipped with elongated arc-chutes, permanent magnetic arc blowout mechanisms, and rated working voltages up to 1000V/1500V DC.
We maintain flexible MOQ policies depending on whether standard components or fully custom tooling/laser-marking is requested. Standard stock product series can be dispatched rapidly, while custom branding, special terminal configurations, or tailored enclosure requirements typically undergo prototype approval within 1-2 weeks and full production within 3-4 weeks.
All products undergo rigorous factory testing in accordance with IEC/EN 60947 and IEC/EN 60898 standards. Our 100% full-inspection SOP includes instant trip verification under calibrated overload multipliers, high-voltage dielectric insulation withstand testing, contact resistance checks, and visual enclosure inspections before final packing.
Browse our extensive catalogue of high-reliability circuit protection, isolator switches, and custom breaker units.
OFA Electrical