High-performance Molded Case Circuit Breakers and Miniature Circuit Breakers engineered for critical industrial and commercial infrastructure.
Understanding the critical role of MCCB OFM1 Series in modern low-voltage distribution, renewable energy microgrids, and smart power automation.
In modern industrial and commercial power distribution architectures, the demand for non-interrupted electrical reliability, rapid fault-clearing capabilities, and dynamic thermal management has never been more paramount. Molded Case Circuit Breakers (MCCBs), specifically high-performance lineups such as the MCCB OFM1 Series, form the backbone of modern low-voltage switchgear assemblies. Engineered to operate under extreme electrical stresses, the OFM1 series guarantees precise isolation, overcurrent protection, and short-circuit interruption across complex power networks.
The OFM1 Series is engineered with modularity, electrical resilience, and mechanical endurance at its core. Manufactured by Wenzhou OFA Electrical Technology Co., Ltd. in Yueqing—the low-voltage electrical capital of China—these switchgears integrate high-grade thermosetting polyester resin or BMC/DMC flame-retardant composite housings. This guarantees superior dielectric strength, high thermal deformation resistance, and structural integrity during intense electromagnetic repulsive forces caused by high short-circuit peak currents (Ipk).
| Technical Parameter | OFM1-63 Frame | OFM1-125 Frame | OFM1-250 Frame | OFM1-400 Frame | OFM1-630 Frame |
|---|---|---|---|---|---|
| Rated Current (In) | 10A - 63A | 16A - 125A | 100A - 250A | 250A - 400A | 400A - 630A |
| Rated Insulation Voltage (Ui) | 800V AC | 800V AC | 800V AC | 1000V AC | 1000V AC |
| Ultimate Short-Circuit Breaking (Icu) | 25kA / 35kA | 35kA / 50kA | 50kA / 65kA | 50kA / 85kA | 65kA / 100kA |
| Service Short-Circuit Breaking (Ics) | 100% Icu | 100% Icu | 75% - 100% Icu | 75% - 100% Icu | 75% - 100% Icu |
| Poles Availability | 3P / 4P | 3P / 4P | 3P / 4P | 3P / 4P | 3P / 4P |
| Trip Unit Technology | Thermal-Magnetic | Thermal-Magnetic | Thermal-Magnetic / Electronic | Electronic / Microprocessor | Electronic / Microprocessor |
During a short-circuit fault, electrical arcs can reach temperatures exceeding 6,000°C within milliseconds. The OFM1 Series incorporates a multi-grid arc chute system featuring de-ionizing steel splitter plates. When an overcurrent or short-circuit trip signal is triggered, the magnetic blow-out mechanism forces the arc rapidly off the silver-alloy contact tips into the arc chute chamber. Here, the arc is split into multiple smaller arcs, cooled, and safely extinguished before plasma blow-out can damage adjacent panel components or cause phase-to-phase flashover.
Furthermore, OFA’s proprietary contact arrangement utilizes double-break technology in higher current frame sizes (400A and 630A). This significantly reduces magnetic repulsive stress on the operating mechanism, ensuring an extended mechanical life exceeding 10,000 operations and electrical endurance up to 4,000 operations without contact welding.
Delivering engineering-grade electrical switchgear with uncompromised quality control, lean production, and end-to-end global compliance.
Our engineering team constantly pushes the boundaries of distribution switchgear, performing rigorous full-process type testing for mechanical endurance, temperature rise, dielectric withstand, and trip calibration under extreme thermal variances.
Equipped with modern automated assembly lines and digital test benches, every unit undergoes strict in-process quality control. We adhere to 100% full-inspection SOPs to minimize factory defect rates down to ppm levels.
Located in Yueqing, Wenzhou—China's premier low-voltage electrical cluster—we maintain deep vertical integration, assuring ultra-competitive lead times, transparent pricing, and instant access to raw material networks.
Navigating the shift toward green energy, smart grid infrastructure, and resilient OEM manufacturing ecosystems.
The global shift toward net-zero carbon emissions, electrification of transport, and rapid rollout of commercial solar PV arrays has fundamentally transformed low-voltage distribution requirements. Modern switchboards no longer simply route steady-state AC mains grid current; they must manage bi-directional power flows, rapid load fluctuations from EV fast-charging hubs, and severe thermal cycles inside battery energy storage systems (BESS).
In response to these demands, procurement teams across North America, Europe, and Asia-Pacific are increasingly prioritizing MCCB solutions featuring higher DC voltage breaking capacities (1000V DC to 1500V DC for PV strings) alongside compact AC frames like the OFM1 series. The integration of microprocessor-based electronic trip units enables real-time current telemetry, early fault prediction, and seamless communication with industrial SCADA and building management systems (BMS).
Wenzhou OFA Electrical Technology Co., Ltd. benefits immensely from its strategic location in Yueqing, Wenzhou. As China's designated "Capital of Electrical Appliances," Yueqing accommodates a complete industrial ecosystem spanning precision mold manufacturing, contact alloy sintering, silver-cadmium-free contact welding, automated coil winding, and digital calibration facilities.
This geographic density empowers OFA to maintain total control over production lifecycles. By integrating Industry 4.0 digital inspection benches, automated laser marking, and robotic calibration rigs, OFA combines high production volume with hyper-consistent component quality. For global EPC contractors and electrical wholesalers, this translates into unprecedented procurement flexibility, reduced lead times, and significant cost advantages over traditional Western OEMs without sacrificing technical compliance.
Mission-critical deployments of OFA circuit breakers across industrial, commercial, and utility infrastructure.
Main distribution panelboards and sub-distribution boards utilizing OFM1 125A and 250A frame MCCBs guarantee selective trip coordination, preventing widespread power outages during localized branch circuit short circuits.
Protecting heavy-duty induction motors, variable frequency drives (VFDs), and industrial automation lines from phase-loss, sustained overloads, and high-energy inductive switching surges.
Specially customized MCCB and MCB units designed to isolate high-voltage solar arrays and battery banks, featuring enhanced arc suppression for DC arc faults.
Ultra-fast current interruption technology prevents catastrophic voltage dips during fault conditions, protecting critical UPS systems and server rack power distribution units (PDUs).
Comprehensive protection switchgear spanning MCCB, MCB, ACB, RCCB, RCBO, and Isolator Switch categories.
Comprehensive heavy-duty protection for industrial power panels. Series include: BA88 Electronic Series, DCM1 Series, DCOF1 Series, OFM1 Series, OFBLT Series, OF1 Series, and OFA-M1 Series.
Precision branch-circuit thermal-magnetic breakers for residential, commercial, and light industrial applications. Product lines include: OF6KA Series, OF10KA C65 Series, OFAFT Series, OFD4Z7 Series, OFDL Series, OFDP, OFDZ47 Series, OFEU Series, OFKL Series, OFKL-NXB Series, OFL7 Series, OFL8 Series, OFNC Series, OFPF Series, and OFP Series.
High-current main breaker units featuring microprocessor trip controllers for power station incoming panels: OFW1 Intelligent Universal Circuit Breaker Series.
Life safety earth-leakage and ground-fault protection units combining residual current sensing with overcurrent protection: OFAP6-AC, OFDPN Series, OFDX Series, OFGX Series, OFID Series, OFL7, OFPM Series, OFC Series, OFKL-80A Series, NB1L Series, OFMIN, OFOM, and OFR1.
Compact main disconnect switches ensuring positive physical separation during maintenance: OFIS-125A Series, OFIS-BH Series, and OFIS-DS Series.
Explore our wide array of high-breaking-capacity MCCB and MCB products designed for global distribution networks.
Read how engineering teams and system integrators globally leverage OFA electrical components to optimize operational efficiency and safety.
"As a system integrator, our company has collaborated with OFA on several industrial automation projects. Their product range is quite comprehensive, covering everything from protective relays to communication gateways, which simplifies our procurement and integration work."
— Andrzej Nowak, Technical Director (Poland)
"We purchased OFA's intelligent power monitoring devices to upgrade the power distribution system in our old workshop. The installation and setup were simpler than expected. Most importantly, they have been running very stably for over a year."
— Markus Weber, Maintenance Manager (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 and achieve energy savings."
— Priya Sharma, Facilities Supervisor (Bangkok, Thailand)
Expert answers regarding technical specifications, procurement procedures, OEM capabilities, and international standards.
OFA Electrical
