Explore our high-performance miniature circuit breakers (MCBs), residual current switches, and isolation switches manufactured under strict ISO9001 and IEC standards.
An authoritative engineering breakdown of thermal-magnetic tripping, arc extinction technology, contact safety, and supply chain strategies for high-reliability electrical distribution switchgear.
The OFIS-DS Series Miniature Circuit Breakers incorporate a state-of-the-art arc chute assembly engineered with 12 to 14 isolated silver-plated steel splitter plates. When a short-circuit fault occurs, the internal electromagnetic coil forces the electric arc into the splitter chamber within milliseconds. The arc is rapidly lengthened, cooled, and extinguished, effectively limiting the let-through energy (I²t) to protect downstream cables and sensitive industrial switchgear from thermal destruction.
Designed for multi-scenario versatility, the OFIS-DS architecture utilizes calibrated bimetallic strips for inverse time-delay overload protection and a precision solenoid plunger for instantaneous short-circuit protection. Available in standard B, C, and D tripping curves, the series accommodates diverse inrush current profiles—from resistive residential lighting circuits to inductive motor loads and high-inrush solar photovoltaic inverter systems.
The OFIS-DS family operates under demanding environmental conditions (-35°C to +70°C), boasting an electrical endurance exceeding 10,000 switching operations and a mechanical life rated up to 20,000 cycles. With a high breaking capacity of 6kA to 10kA under IEC/EN 60898-1 and IEC 60947-2 standards, Wenzhou OFA Electrical Technology Co., Ltd. ensures uncompromising safety across commercial, industrial, and utility-scale installations.
| Parameter Category | OFIS-DS Standard Specification | OFL8 / OFNC High-Cap Variant | OFM1 Industrial MCCB Variant |
|---|---|---|---|
| Rated Current (In) | 1A, 2A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | 6A to 63A | 63A, 125A, 250A, 400A, 630A |
| Number of Poles | 1P, 2P, 3P, 4P, 1P+N, 3P+N | 2P, 4P | 3P, 4P |
| Rated Voltage (Ue) | AC 230V/400V (50/60Hz), DC 48V/110V | AC 240V/415V | AC 400V/690V |
| Short-Circuit Capacity (Icn) | 6,000A (6kA) / 10,000A (10kA) | 6kA / 10kA | 25kA to 65kA |
| Tripping Characteristics | B Curve (3-5 In), C Curve (5-10 In), D Curve (10-14 In) | B Curve, C Curve | Electronic / Thermal-Magnetic Adjustable |
| Standards Compliance | IEC/EN 60898-1, IEC/EN 60947-2, CE, RoHS | IEC/EN 60898-1, CE | IEC/EN 60947-2, GB/T 14048.2 |
Designed for mission-critical infrastructure, our circuit breakers and isolating switches ensure continuous operational safety across challenging environments worldwide.
Solar arrays and battery storage plants demand continuous DC voltage circuit isolation and AC grid interconnection protection. The OFIS-DS and OFBLT DC Series handle high DC system voltages, preventing thermal runaway and protecting string inverters from feedback fault currents.
High-density commercial structures require compact modular circuit protection within sub-distribution boards. OFIS-DS 1P, 2P, 3P, and 4P breakers fit seamlessly onto standard 35mm DIN rails, enabling rapid wiring, low contact resistance, and reliable load isolation for HVAC and elevator panels.
Machine builders and OEM control cabinet panel builders demand components that withstand mechanical vibration and ambient temperature swings. OFIS-DS breakers deliver precise overcurrent protection to PLC controls, VFD drives, and conveyor motor circuits.
Modern cloud server infrastructure cannot tolerate un-tripped short circuits or nuisance tripping. The precise thermal calibration of OFIS-DS breakers guarantees selective tripping coordination, isolating single server rack faults while keeping main power buses live.
Integrating residual current devices (RCCB/RCBO) alongside OFIS-DS miniature circuit breakers provides dual-layer defense against AC ground leakage faults and DC residual currents, fulfilling strict global regulations for electric vehicle charging poles.
Providing residential consumers with dependable, tool-free installation breakers. The tunnel terminal design accepts both flexible copper wires and rigid copper busbars, eliminating loose connection hazards and reducing fire risks.
Rooted in Yueqing, Wenzhou—the World Capital of Electrical Appliances—Wenzhou OFA Electrical Technology Co., Ltd. combines advanced industrial clusters with rigorous quality assurance.
Located at the core of China's electrical ecosystem in Yueqing, our factory enjoys immediate access to high-purity silver-graphite contacts, flame-retardant VO-grade PA66 housing materials, and precision bimetals. This localized cluster eliminates supply chain bottlenecks, ensuring stable raw material costs and rapid order turnaround.
Our manufacturing facility features automated stamping, plastic molding, and robotic calibration assembly lines. Every OFIS-DS unit undergoes 100% automated instantaneous trip verification, thermal overload calibration, and dielectric withstand voltage testing before entering final packaging.
We empower global brand owners, importers, and EPC engineering firms with comprehensive OEM/ODM customization services. From custom laser-engraved branding, specific tripping curve tuning, to localized language outer packaging and barcoding, we deliver market-ready products tailored to your regional regulations.
Quality is our non-negotiable standard. Operative under ISO9001 certified protocols, every batch of circuit breakers is logged with batch code traceability, enabling complete visibility from raw copper ingots to customer panel installation.
Navigating cross-border electrical standards requires proven engineering support, clear documentation, and standardized product testing.
All OFIS-DS Series breakers carry CE marking, compliance reports for IEC/EN 60898-1 and IEC 60947-2, and RoHS environmental compliance documentation. This ensures seamless customs clearance across Europe, South America, the Middle East, Southeast Asia, and Africa.
Global power grids vary significantly in frequency and voltage. Our engineering team provides custom coil windings and calibration for 110V/220V/400V AC systems at 50Hz or 60Hz, as well as high-voltage DC protection for solar microgrids operating up to 1000V DC.
We provide enterprise clients and EPC contractors with complete technical bid documentation: CAD dimension blueprints, Type Test Reports from accredited third-party laboratories, Certificate of Origin (Form E, CO), and localized user installation datasheets.
Understanding the technological shifts shaping the future of low-voltage distribution switchgear.
Modern smart buildings and automated factories are rapidly migrating from traditional passive breakers to intelligent distribution devices. The future of the miniature circuit breaker lies in combining traditional thermal-magnetic mechanisms with wireless IoT chips (Zigbee, Modbus RS485, Wi-Fi) to deliver real-time current monitoring, temperature sensing, and predictive maintenance alerts to cloud dashboards.
Global decarbonization mandates require manufacturers to adopt eco-friendly materials. Wenzhou OFA Electrical Technology Co., Ltd. is committed to sustainable green manufacturing, using halogen-free, non-toxic, recyclable flame-retardant polymers that comply with strict EU REACH and RoHS environmental directives without sacrificing mechanical rigidity.
As electrical loads expand in data centers and EV supercharging hubs, panel space remains limited. The market demands higher interrupting capacity (up to 10kA or 15kA) within compact 18mm module widths per pole. OFIS-DS engineering focuses on optimized arc chute geometry and fast-acting magnetic coils to deliver maximum protection in minimal dimensions.
With global solar installations rising, traditional AC breakers are insufficient for breaking continuous DC arcs. Specialized DC circuit breakers and non-polarized switch isolators are becoming standard requirements in residential and commercial solar combiner boxes.
A streamlined, step-by-step engineering procurement process for OEM/ODM orders and project-based supply contracts.
Submit your circuit protection specifications, including voltage, pole configurations, tripping curves, rated current, breaking capacity, and volume expectations.
OFA technical engineers analyze your parameters, recommend standard OFIS-DS models or design custom OEM solutions, and issue a clear wholesale quotation.
Golden pre-production samples are manufactured and dispatched for client laboratory verification, fitting tests, and regional compliance sign-off.
Full-scale automated production commences. Products complete 100% full-inspection SOPs before seaworthy/airworthy packaging and global delivery.
Everything you need to know about OFIS-DS Series miniature circuit breakers, manufacturing standards, and supplier capabilities.
Complete your power system protection with our extensive selection of MCCBs, DC breakers, and specialized residual current switches.
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