Explore our high-performance miniature circuit breakers engineered for exceptional short-circuit interrupting capacity, precise thermal-magnetic tripping, and long-term operating reliability across extreme environments.
In the contemporary landscape of global power distribution, the demand for modular, high-breaking-capacity, and intelligent protective equipment has reached an unprecedented peak. Modern commercial facilities, industrial automation plants, data centers, and renewable energy grids require switchgear systems that operate with millisecond-level responsiveness.
The OFL8 Series Miniature Circuit Breakers (MCB) serve as the frontline protective vanguard. Engineered by Wenzhou OFA Electrical Technology Co., Ltd., these breakers are designed to mitigate short-circuit overcurrents, thermal overloads, and system degradation. Grounded in a decade of manufacturing mastery within Yueqing, China—the global epicenter of low-voltage electrical apparatus—our enterprise integrates research, automated manufacturing, and rigorous zero-defect quality control.
The electrification of global economies—driven by EV infrastructure, distributed solar PV microgrids, edge data centers, and heavy industrial automation—has fundamentally altered low-voltage grid dynamics. Traditional circuit breakers often struggle under the stresses of non-linear loads, high inrush currents, and severe harmonic distortion.
Photovoltaic installations and Battery Energy Storage Systems (BESS) require bi-directional current flow management and robust DC/AC fault interruption. OFL8 and auxiliary series (OFD4Z7, OFKL) provide stable protection against reverse-current overloads and insulation failure.
Mission-critical IT operations require Tier IV power availability. A single false trip or breaker weld can cause millions in lost revenue. The OFL8 series features high-speed silver-alloy contacts designed to clear faults in under 10 milliseconds without nuisance tripping.
Commercial facilities are moving toward centralized energy management systems (EMS). Integrating miniature circuit breakers with auxiliary signaling contacts and remote shunt trips allows facility management teams to dynamically isolate faults from cloud dashboards.
The OFL8 series miniature circuit breaker operates through a dual-tripping mechanism: a bimetallic strip for inverse-time thermal overload protection, and an electromagnetic solenoid for instantaneous short-circuit protection. When an overcurrent occurs, thermal expansion triggers the trip latch, whereas severe short-circuit currents create an intense magnetic field that drives the plunger instantly.
| Technical Parameter | IEC 60898-1 Standard Range | OFL8 Engineering Specification | OFA Factory Advantage |
|---|---|---|---|
| Rated Current (In) | 1A – 63A | 1A, 2A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | 100% Calibrated Thermal Tripping Curves |
| Number of Poles | 1P, 2P, 3P, 4P | 1P, 2P, 3P, 4P, 1P+N, 3P+N | Modular Width (17.5mm per pole) |
| Breaking Capacity (Icn) | 4,500A – 6,000A | 6,000A (6kA) & 10,000A (10kA) Options | Enhanced De-ion Arc Chute (12 Plates) |
| Tripping Characteristics | B, C, D Curves | B (3-5In), C (5-10In), D (10-14In) Curves | Precision Magnetic Plunger Calibration |
| Rated Voltage (Ue) | 230V / 400V AC | 240V/415V AC (50/60Hz); up to 125V DC (per pole) | High Dielectric Strength (>2500V) |
| Electrical / Mechanical Life | 4,000 / 10,000 operations | 10,000 Electrical / 20,000 Mechanical Ops | Silver-Graphite Contact Inlay (AgC) |
| Enclosure Protection | IP20 / IP40 | IP20 (Terminals), IP40 (Distribution Box) | Flame-Retardant Thermoplastic (UL94-V0) |
Optimization of the internal arc-chute design featuring 12 steel splitter plates. Rapid magnetic blow-out forces the electrical arc into the chute, extinguishing 10kA short circuits within 3 to 5 milliseconds, drastically reducing thermal stress on cables.
Integration of miniature current sensors and wireless telemetry (Zigbee/RS485 Modbus) directly into standard MCB form factors, allowing real-time power monitoring and predictive maintenance alert before trip thresholds are breached.
Incorporating wide-bandgap semiconductor switches (GaN/SiC) alongside traditional mechanical contacts to enable sub-millisecond, arcless isolation for hyper-sensitive DC microgrids and hydrogen fuel cell power systems.
Every industrial vertical presents unique operational challenges. Wenzhou OFA Electrical Technology Co., Ltd. customizes its protection equipment to deliver targeted performance metrics across diverse international standards and environmental stresses.
Challenge: Direct current (DC) arcs do not have a natural zero-crossing point, making arc extinction exceptionally difficult compared to AC power.
OFA Solution: Specially rated OFD4Z7 and DC-adapted OFL8 series incorporate permanent magnets that pull the DC arc into the quenching chamber. Compliant with IEC 60947-2, these units safeguard string inverters and battery bank combiner boxes.
Challenge: Continuous high-current loads cause cumulative thermal buildup within compact distribution boards, increasing the risk of false thermal tripping.
OFA Solution: OFL8 breakers employ low-resistance silver-inlaid contacts and calibrated bimetallic strips engineered for high ambient temperatures (+55°C operation without severe de-rating), paired with OFR1 RCBOs for residual current ground-fault protection.
Challenge: Inductive motor loads generate severe current surges upon startup, causing standard Type B or Type C breakers to trip erroneously.
OFA Solution: D-Curve OFL8 and OF6KA series miniature circuit breakers are calibrated to withstand inrush currents up to 14 times the rated current (14In) for 0.1 seconds, preventing nuisance trips while preserving robust short-circuit defense.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is rooted in Yueqing, Wenzhou—the renowned Capital of Electrical Appliances in China. We specialize in the complete research, development, assembly, and global export of distribution switchgear, control equipment, and low-voltage protection components.
Upholding our core principles of "Professionalism, Integrity, and Pragmatic Innovation," OFA owns independent proprietary brands including "OFA". For seven consecutive years, our enterprise has been officially rated as Tax Credit Grade A—a testament to our financial reliability and corporate transparency.
Our ISO9001-certified smart facility operates automated calibration stations, high-voltage dielectric testers, thermal-rise testing rigs, and digital automated assembly lines. Whether fulfilling standard high-volume orders or executing complex OEM/ODM projects, we maintain a 100% full-inspection Standard Operating Procedure (SOP).
Our enterprise manufactures a comprehensive range of electrical components designed for seamless integration within main distribution boards (MDB), sub-distribution boards (SDB), and final branch circuits.
Main incoming circuit protection engineered for higher current ratings (up to 1250A) and heavy industrial duty.
Key Series: BA88 Electronic Series, DCM1 Series, DCOF1 Series, OFM1 Series, OFBLT Series, OF1 Series, OFA-M1 Series.
Compact modular devices for final circuit distribution against overloads and short circuits in commercial & residential panels.
Key Series: OFL8 Series, OF6KA Series, OF10KA C65 Series, OFAFT Series, OFD4Z7 Series, OFDL Series, OFDP, OFDZ47 Series, OFEU Series, OFKL Series, OFKL-NXB Series, OFL7 Series, OFNC Series, OFPF Series, OFP Series.
Intelligent, high-current universal breakers utilized at low-voltage main power entry stations for grid isolation and intelligence.
Key Series: OFW1 Intelligent Universal Circuit Breaker Series.
Pure earth leakage protection units designed to detect minute leakage currents and safeguard human life from direct/indirect electrical shock.
Key Series: OFAP6-AC Series, OFDPN Series, OFDX Series, OFGX Series, OFID Series, OFL7 Residual Series, OFPM Series.
All-in-one protective devices that merge MCB thermal-magnetic overcurrent defense with high-sensitivity RCD earth leakage protection.
Key Series: OFC Series, OFKL-80A Series, NB1L Series, OFMIN Series, OFOM Series, OFR1 Series.
Robust load-break disconnecting switches providing visible physical isolation for maintenance safety in distribution systems.
Key Series: OFIS-125A Series, OFIS-BH Series, OFIS-DS Series.
Whether you require off-the-shelf standard OFL8 units or custom engineered low-voltage switchgear solutions for international infrastructure projects, we offer two streamlined engagement models:
Ideal for distributors, electrical wholesalers, and standard commercial panel builders requiring rapid fulfillment.
Designed for EPC contractors, industrial automation integrators, and international brands seeking customized housing, branding, or parameters.
Get authoritative answers regarding product selection, regulatory compliance, factory capabilities, and technical specifications for the OFL8 series and related distribution equipment.
The OFL8 Series features an advanced 12-plate arc-quenching chute, silver-graphite alloy contacts, and a high-precision dual thermal-magnetic mechanism. Designed for up to 10kA short-circuit breaking capacity under IEC 60898-1 standards, it delivers lower contact resistance, superior heat dissipation, and enhanced durability during high-frequency switching operations.
Yes. We offer complete OEM/ODM solutions including custom housing colors, customized trip curves (B, C, or D curves), private label pad-printing/laser-marking, dynamic packaging, and modified terminal geometry to match specific regional panel builder specifications.
An RCBO combines overcurrent, short-circuit, and earth leakage protection into a single modular width unit (often 1P+N in 18mm or 36mm). This saves over 50% of DIN-rail space inside consumer units, reduces wiring complexity and labor, and isolates faults strictly to the affected branch without shutting down adjacent circuits.
Our products strictly comply with international standards such as CE, IEC 60898-1, and IEC 60947-2. Our manufacturing facility operates under an ISO9001 certified system, implementing 100% automated inspection SOPs covering dielectric withstand voltage, instant magnetic trip response, and thermal calibration verification.
We provide full-lifecycle technical support: pre-project remote engineering consulting, BIM/CAD drawing support, online installation guidelines, and rapid-dispatch logistics. We partner with leading ocean and air freight forwarders to ensure customs-cleared, insured export delivery to over 100 countries.
Discover why leading system integrators, plant managers, and facility directors rely on OFA protection equipment for their critical low-voltage infrastructure.
"As a system integrator in Poland, our company has collaborated with OFA on multiple industrial automation projects. Their product range is remarkably comprehensive—from protective relays to OFL8 MCBs—simplifying our procurement and integration work. Product quality is highly consistent, eliminating commissioning delays on site."
"We retrofitted our workshop distribution boards with OFA intelligent monitoring devices and OF10KA series breakers over a year ago. Installation was seamless, setup was intuitive, and operational stability has been 100%. Most importantly, their clear technical documentation made compliance verification straightforward."
"Deploying OFA's protection components and energy management platform across commercial office towers in Bangkok was a strategic win. The equipment performs reliably in high ambient humidity, and their online technical support team responds within hours whenever we request custom wiring schematics."
Browse our extended line of RCBOs, high-capacity MCBs, isolator switches, and molded case circuit breakers engineered for total network protection.
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