Explore our premier lineup of miniature circuit breakers (MCBs), residual current devices (RCBOs/RCCBs), and molded case circuit breakers (MCCBs) manufactured under stringent ISO9001 and IEC international standards.
In modern electrical distribution architecture, safety, reliability, and precision protection are paramount. As global electrification accelerates through renewable integration, smart building automation, EV charging networks, and industrial digitalization, circuit protection devices are subjected to unprecedented electrical stresses. Wenzhou OFA Electrical Technology Co., Ltd. stands at the forefront of this industrial evolution as a premier China IEC 60898 certified factory and supplier.
The standard IEC 60898-1 (Electrical accessories — Circuit-breakers for overcurrent protection for household and similar installations) specifies rigorous mechanical, electrical, and thermal parameters for AC miniature circuit breakers (MCBs) operating up to 440V between phases and rated currents not exceeding 125A. Compliance guarantees that circuit protection equipment can operate reliably without skilled maintenance, offering uncompromised protection against overloads and short circuits in residential, commercial, and public infrastructure worldwide.
For electrical procurement officers, EPC contractors, OEM brand owners, and system integrators, selecting the correct low-voltage protective gear requires a precise technical understanding of standard frameworks. Below is an engineering comparison between IEC 60898-1 (Household & Similar) and IEC 60947-2 (Industrial Circuit Breakers).
| Evaluation Parameter | IEC 60898-1 Standard (Household/Commercial) | IEC 60947-2 Standard (Industrial Systems) |
|---|---|---|
| Target User Base | Unskilled / General Operators (Plug & Play Safety) | Instructed / Skilled Electrical Engineers |
| Tripping Characteristics | Curve B (3-5 $I_n$), Curve C (5-10 $I_n$), Curve D (10-20 $I_n$) | Customizable Curves (K, Z, Adjustable Electronic Trip) |
| Short-Circuit Capacity ($I_{cn}$) | Typically 4.5kA, 6kA, 10kA (Rated Ultimate Breaking Capacity) | Up to 50kA, 100kA+ ($I_{cu}$ Service / Ultimate Capacity) |
| Pollution Degree / Environment | Degree 2 (Standard Indoor / Panel Distribution) | Degree 3 or Higher (Heavy Industrial / Harsh Conditions) |
| Calibration Ambient Temp | Fixed Standard Reference ($30^\circ\text{C}$) | Variable Reference ($40^\circ\text{C}$ or Custom Engineering) |
OFA’s IEC 60898 certified MCBs utilize bimetallic strips for calibrated inverse time-delay thermal overload tripping, combined with an electromagnetic coil mechanism for dynamic instantaneous short-circuit protection within milliseconds.
Equipped with 12-to-15 plate arc chutes, magnetic blow-out runners, and silver-alloy contact points ($AgSnO_2$), our breaker chambers rapidly split and cool electrical arcs during fault isolation, extending contact mechanical and electrical lifespan.
Constructed with high-rigidity engineering thermoplastics (PA66/PC), OFA products pass glow-wire testing at $960^\circ\text{C}$, providing VO flame retardancy, superior dielectric strength, and resistance to environmental stress cracking.
Professional, Reliable, and Time-Tested!
Wenzhou OFA Electrical Technology Co., Ltd., founded in 2013, is rooted in Yueqing, Wenzhou — the world-renowned "Capital of Electrical Appliances" in China. We specialize in the research, development, custom manufacturing, and international export of low-voltage distribution switchgear, miniature circuit breakers (MCBs), molded case circuit breakers (MCCBs), air circuit breakers (ACBs), residual current operated devices (RCCBs/RCBOs), and isolators.
Owning proprietary brands such as "OFA", our products serve critical power infrastructure, renewable energy projects, industrial automation lines, residential installations, and equipment manufacturing globally. Upholding honest and law-abiding operations, OFA has been honored with a Tax Credit Grade A rating for seven consecutive years, building unshakeable trust among B2B buyers worldwide.
OFA delivers system-level expertise across all critical low-voltage protection categories. Explore our comprehensive product families built for safety, intelligence, and endurance.
Designed to make, carry, and break currents under normal and abnormal fault conditions (overload/short-circuit) in industrial networks up to 630A/800A.
Series Included: BA88 Electronic Series, DCM1 Series, DCOF1 Series, OFM1 Series, OFBLT High-Performance DC Series, OF1 Series, OFA-M1 Series.
The ultimate compact defense for end-of-line terminal distribution. Fully certified under IEC 60898-1 for residential and commercial sub-panels.
Series Included: OF6KA, OF10KA C65, OFAFT, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, OFP Series.
Core protection master switches for high-capacity main power intake panels, featuring micro-processor controller units, communication protocols, and high interrupting capacity.
Series Included: OFW1 Intelligent Universal Circuit Breaker Series.
Integrating earth leakage detection (10mA/30mA/100mA/300mA) with overcurrent protection to eliminate electrical shock hazards and equipment ground faults.
Series Included: OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, OFPM, OFC, OFKL-80A, NB1L, OFMIN, OFOM, OFR1 Series.
Combines safe electrical isolation with robust mechanical switching, facilitating safe downstream maintenance in solar PV arrays and distribution switchboards.
Series Included: OFIS-125A, OFIS-BH, OFIS-DS Isolator Switch Series.
The global power equipment procurement paradigm has shifted towards manufacturers offering high structural agility, stringent quality management, and rapid time-to-market. Sourcing directly from Wenzhou OFA Electrical Technology Co., Ltd. unlocks unmatched strategic advantages:
Yueqing hosts the world's most concentrated low-voltage electrical component supply chain. From precision stamping, silver contact welding, molding, to coil winding, OFA secures premium raw materials at optimized cost structures.
OFA operates automated assembly lines and digital testing workstations. Every IEC 60898 MCB undergoes automated thermal calibration, magnetic trip verification, contact resistance checking, and high-voltage insulation dielectric testing.
Unlike suppliers relying solely on batch sampling, OFA enforces a 100% full-inspection Standard Operating Procedure for out-of-factory clearance, keeping defect rates near zero and preserving your brand reputation.
We support global brands with custom laser markings, private-label packaging, customized breaking capacity ratings ($I_{cn}$ = 4.5kA, 6kA, 10kA), custom tripping curves (B, C, D), and localized mounting clips.
OFA electrical equipment is deployed worldwide, safeguarding critical distribution networks across multiple demanding environments.
Safe consumer units, distribution boxes, and RCCB/RCBO earth leakage modules protecting household appliances, lighting circuits, and occupants from residual current hazards.
High-density panelboards and sub-distribution systems in office towers, shopping malls, hotels, and hospitals requiring continuous 24/7 power availability and selective tripping.
Reliable overload protection for PLC racks, motor starters, control transformers, conveyor networks, and automated manufacturing lines operating under severe mechanical vibration.
Specialized high-voltage DC MCCBs (OFBLT series up to 250HU) and AC surge/protection equipment for PV combiner boxes, solar inverters, battery storage (BESS), and fast EV charging stations.
Starting a new procurement or custom engineering project with OFA is streamlined for clear ROI, full technical transparency, and rapid turnaround.
Ideal for: Regional distributors, electrical wholesalers, panel builders, and standard commercial retrofits seeking fast lead times and proven IEC 60898 compliant inventory.
Ideal for: Global electrical OEMs, EPC contractors, utility microgrids, and large-scale industrial distribution automation upgrades.
State-of-the-art testing infrastructure, lean production workshops, and quality assurance checkpoints.
See why global system integrators and facility managers rely on OFA for low-voltage safety.
"As a system integrator in Poland, we have collaborated with OFA on multiple industrial automation projects. Their product range is remarkably comprehensive, covering everything from protective relays to MCBs. The quality is consistent, eliminating on-site commissioning friction."
"We upgraded our plant distribution panels with OFA’s intelligent power monitoring and IEC certified miniature circuit breakers. They have operated flawlessly for over a year. The technical datasheets provided clear guidance for our maintenance team."
"Deploying OFA's energy monitoring and RCBO protection modules across our commercial office buildings was a great investment. We gained precise control over energy use and ground fault safety. Their responsive remote engineering support is top-notch."
"In renewable solar energy projects, breaker reliability in outdoor combiner boxes is crucial. OFA's DC molded case breakers (OFBLT Series) met our core demands at competitive factory-direct pricing."
Find expert technical and commercial answers regarding IEC 60898 compliance, factory capabilities, and global procurement.
OFA combines over a decade of dedicated low-voltage engineering experience in Yueqing with an ISO9001 quality system, 100% full-inspection SOPs, and Grade A tax credit rating. Our breakers undergo full type testing to verify compliance with IEC 60898-1 parameters, ensuring reliable thermal overload and magnetic short-circuit performance for international markets.
Curve B trips instantaneously between 3 to 5 times the rated current ($I_n$), ideal for resistive loads and domestic heating. Curve C trips between 5 to 10 $I_n$, standard for commercial lighting and general inductive loads. Curve D trips between 10 to 20 $I_n$, specifically engineered for high inrush current equipment like motors, transformers, and industrial power supplies.
Yes, we provide extensive OEM/ODM services. We can customize breaker current ratings, short-circuit breaking capacity ($I_{cn}$ up to 10kA), shell branding, laser mark printing, custom packaging, and specific mounting hardware according to your market’s regulatory requirements.
Our core product lines hold CE, IEC type test certificates, CCC, and comply with ISO9001 quality management guidelines. Detailed test reports for breaking capacity, temperature rise, dielectric withstand, and mechanical endurance are available upon inquiry.
We offer flexible MOQ policies for standard product lines. For standard orders, lead times typically range from 15 to 25 days depending on batch volume. Customized OEM solutions or non-standard configurations are evaluated on a project-by-project basis with fast sampling turnaround.
Explore additional certified low-voltage solutions, isolators, and residual current circuit breakers engineered by Wenzhou OFA Electrical Technology.
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