Explore our top-tier protective devices designed for industrial automation, renewable integration, and high-reliability commercial power distribution systems.
Navigating the Modern Electrical Infrastructure Landscape with Precision Engineering and High Short-Circuit Breaking Capacities.
As the global power sector accelerates toward electrification, renewable integration, and high-density industrial automation, low-voltage distribution systems face unprecedented stresses. Higher fault levels, harmonics from non-linear loads, and continuous duty cycles demand robust primary circuit protection. Air Circuit Breakers (ACBs) serve as the vital backbone in main distribution boards (MDBs), protecting transformers, generators, and heavy industrial feeders from catastrophic overcurrent and short-circuit faults.
Traditional thermal-magnetic trip units are giving way to micro-processor-based electronic releases equipped with IoT protocol integration (Modbus-RTU, Ethernet/IP, IEC 61850). Modern ACBs do not merely interrupt faults—they log power quality metrics, perform predictive thermal analysis of main contacts, and offer selective coordination ($I_{cw}$ withstand capacity) to eliminate non-selective nuisance tripping in critical facilities.
Engineering Benchmark: High-performance ACBs must offer a ultimate short-circuit breaking capacity ($I_{cu}$) equal to their service breaking capacity ($I_{cs}$), combined with a high rated short-time withstand current ($I_{cw}$ for 1s). This ensures zero degradation after breaking max-level electrical faults, keeping downtime to absolute minimums.
| Technical Parameter | Standard Industrial ACB | OFA High-Performance Intelligent ACB (OFW1) | Application Impact |
|---|---|---|---|
| Rated Current ($I_n$) | 630A – 4000A | 630A – 6300A Frame Sizes | Accommodates massive main distribution buses and large step-down transformers. |
| Breaking Capacity ($I_{cu} = I_{cs}$) | 50kA – 65kA @ 415V | up to 100kA @ 415V / 85kA @ 690V | Guarantees safety in ultra-high short-circuit current industrial environments. |
| Short-time Withstand ($I_{cw}$) | 42kA / 1s | up to 85kA / 1s | Enables absolute downstream selectivity without premature tripping. |
| Trip Controller Type | Basic Electronic LSI | Smart Microprocessor LSIG + Harmonics + IoT | Real-time current analytics, power monitoring, and predictive maintenance alerts. |
Driving the continuous progress of power distribution and control technology from Yueqing, Wenzhou — the Capital of Electrical Appliances in China.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou. We own independent brands such as "OFA", with products serving diverse industries including utility power, solar energy, industrial automation, commercial construction, and machinery equipment manufacturing.
We adhere to honest, compliant operations and have been rated as Tax Credit Grade A for seven consecutive years. We provide global clients with low-voltage distribution switchgear, control components, and custom supporting solutions that feature rock-solid stability and clear cost advantages.
Our facility operates under strict ISO9001 Quality Management System standards, executing 100% full-inspection SOPs to guarantee international safety compliance (CE, UL, IEC standards).
Our technical team continues to delve deep into distribution equipment accessories, equipped with type testing and factory inspection devices for mechanical endurance, temperature rise, and dielectric insulation performance.
Automated assembly lines and digital inspection stations ensure that components to finished breakers remain under strict process control, keeping out-of-factory defect rates extremely low.
Combining standardized production with rapid OEM/ODM customization, matching exact customer specs while shortening time-to-market and keeping procurement costs optimized.
Providing verified electrical equipment built to withstand extreme environmental conditions, severe load surges, and demanding operational cycles.
Zero downtime tolerance demands total selectivity. OFA ACBs integrated with dual power automatic transfer switches (ATS) guarantee seamless switching and transient overload withstand for hyperscale data centers.
Designed for DC up to 1500V and high AC voltages (up to 690V/800V). Our specialized breakers (such as the OF1-125/PV series) effectively quench high-energy DC arcs during reverse current events.
Handling harsh motor-starting currents and repetitive switching stress. Advanced arc-chute design prevents contact welding and reduces phase-to-phase flashover risks in steel mills and chemical plants.
High continuous load density and harmonic pollution from fast DC chargers require robust MCBs, MCCBs, and RCCBs to prevent nuisance tripping while providing absolute personnel safety against ground leakage.
Integrated energy efficiency monitoring at sub-metering points. Compact modular circuit breakers and residual protection units safeguard tenants, lighting circuits, and HVAC infrastructure.
Deployed across metro systems, airport terminals, and water treatment utilities. Certified compliance ensures long-term operational peace of mind under public procurement standard checks.
From main incoming switchgear (ACB) to downstream final distribution (MCB/RCBO), OFA manufactures complete low-voltage protective devices.
Core protection for main feeder panels. OFW1 Intelligent Universal Circuit Breaker series featuring microprocessor trip controllers, draw-out & fixed mounting, and communication capabilities.
Feeder & distribution protection up to 1600A. Series include BA88 Electronic, DCM1, DCOF1, OFM1, OFBLT, OF1, and OFA-M1. Exceptional breaking capacity and adjustable thermal-magnetic releases.
Final circuit protection for lighting and small loads. Models include OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, and OFP series.
Personal shock protection and fire hazard mitigation. Solutions comprise OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, and OFPM series with AC, A, and B type leakage detection.
Single-unit space saving protection. Features OFC, OFKL-80A, NB1L, OFMIN, OFOM, and OFR1 series providing overcurrent, short-circuit, and high-sensitivity residual current trips.
Safe isolation for maintenance and emergency cut-off. Includes OFIS-125A, OFIS-BH, and OFIS-DS series engineered for high mechanical endurance and reliable isolation gaps.
Ensuring global export readiness with rigorous quality certifications and dedicated engineering responsiveness.
Every electrical component manufactured at OFA undergoes continuous validation against international benchmarks:
We provide full-lifecycle technical support to system integrators, switchboard builders, and EPC contractors globally:
Pioneering smart, eco-friendly, and hybrid breaking technology to meet the demands of tomorrow's energy grid.
Integrating micro-optical sensor arrays within arc-chutes and busbars. Continuous temperature and contact erosion data are processed via AI edge gateways to predict contact life before physical failure occurs.
Developing semiconductor-based switching topology for microsecond-level fault interruption. Ideal for DC microgrids, battery energy storage, and sensitive semiconductor manufacturing facilities.
Replacing traditional greenhouse-gas emitting materials with zero-carbon synthetic resin insulation and nitrogen-assisted arc suppression chambers, reducing lifecycle environmental impact.
See why industrial automation integrators and facility managers rely on OFA for their electrical switchgear systems.
Got questions regarding ACB selection, OEM capabilities, or delivery terms? Find clear, expert answers below.
From technical scoping to final site handover, here is how we collaborate to deliver reliable power systems.
Discover more certified circuit breakers and modular protection devices manufactured for dependable operation.
OFA Electrical
