Explore our engineering-grade 1P, 2P, 3P, 4P MCBs, MCCBs, and RCCBs tested for rigorous international compliance.
In modern low-voltage electrical distribution networks, the Single Pole Miniature Circuit Breaker (1P MCB) serves as the fundamental building block of sub-circuit overload and short-circuit protection. Designed primarily for 230/400V AC 50/60Hz networks (and up to 60V/125V DC in specialized applications), the single pole MCB isolates phase conductors when current flows exceed defined thermal or electromagnetic thresholds.
As power densities escalate in commercial smart buildings, data centers, and renewable energy auxiliary panels, the demand for high-reliability single pole MCBs with superior breaking capacities (6kA to 10kA) and calibrated trip characteristics (B, C, and D curves) has reached an all-time high. Wenzhou OFA Electrical Technology Co., Ltd., leveraging over a decade of continuous technological refinement in Yueqing, Wenzhou—China's low-voltage electrical capital—engineered the OFIS and OFKL single pole lines to deliver ultra-fast contact breaking (<2.5 ms) and flame-retardant V-0 grade polyamide enclosures that guarantee operational longevity.
A high-performance single pole MCB must balance dynamic electromechanical responses with thermal dissipation efficiency. The physical engineering encompasses four key operational subsystems:
| Technical Parameter | Standard Commercial Grade | OFA Engineering Grade (OFIS / OFKL 1P) |
|---|---|---|
| Rated Short-Circuit Capacity (Icn) | 4.5kA / 6kA | 6.0kA / 10.0kA (IEC 60898-1 certified) |
| Tripping Curve Options | C Curve only | B, C, D Curves available |
| Electrical & Mechanical Endurance | 4,000 / 8,000 Operations | 10,000 Electrical / 20,000 Mechanical Cycles |
| Housing Thermal Resistance | Standard ABS / Nylon 6 | PA66 Flame-Retardant (UL94 V-0, 960°C Glow Wire) |
| Ambient Operating Range | -5°C to +40°C | -35°C to +70°C (With temperature derating factor) |
Understanding how global electrification, energy efficiency mandates, and IoT integration are reshaping low-voltage circuit protection demand.
Global panel builders are drastically reducing enclosure footprints. Demand has surged for 1-Pole + Neutral (1P+N) MCBs housed in a single 18mm module width, effectively doubling circuit density inside commercial consumer units while maintaining high breaking capacity.
Circuit breakers are transitioning from passive trip switches to intelligent telemetry nodes. Next-gen single pole MCBs feature embedded current transformers and wireless communication modules (RS485 Modbus / Zigbee) to transmit temperature rise, current load, and tripping history to cloud SCADA platforms.
With massive growth in solar PV string boxes, battery energy storage systems (BESS), and EV charging stations, specialized single-pole DC MCBs (up to 250V DC per pole) are essential to prevent back-feed overcurrents and handle stubborn DC arc clearance.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is located in Yueqing, Wenzhou—the world-renowned cluster for low-voltage electrical apparatus. With standard industrial facilities, automated assembly lines, and high-precision digital test stations, OFA specializes in the research, development, and high-volume manufacture of distribution switchgear and control equipment.
Upholding a culture of "Pragmatic Innovation, Strict Quality Control, and Client Reliability," OFA has maintained a Tax Credit Grade A rating for 7 consecutive years. We operate independent brands like "OFA" while delivering turnkey OEM/ODM solutions for system integrators, wholesalers, and EPC contractors in over 50 countries across Europe, South America, the Middle East, and Southeast Asia.
How OFA single pole miniature circuit breakers power and protect diverse global installations.
In residential consumer units, single pole 1P MCBs (6A to 32A, B & C curves) safeguard individual lighting circuits, socket outlets, and home automation control units. Compact designs ensure clean wiring within DIN-rail enclosure boards.
Inductive loads like air handling units, pumps, and compressors demand D-curve 1-pole MCBs capable of handling high initial inrush currents (up to 14 times rated current) without nuisance tripping during startup phase.
Critical 24V/48V DC auxiliary control lines and uninterruptible power supply (UPS) distribution networks mandate ultra-reliable single pole circuit breakers with silver-alloy contacts to prevent overheating under continuous 100% duty cycles.
Integrate our single pole MCBs with a complete family of MCCBs, ACBs, RCCBs, and Isolators for total selective protection coordination.
Includes OF6KA, OF10KA C65, OFD4Z7, OFDL, OFDP, OFDZ47, OFEU, OFKL, OFKL-NXB, OFL7, OFL8, OFNC, OFPF, and OFP series covering 1P, 2P, 3P, 4P topologies.
Covers MCCB BA88 Electronic, DCM1, DCOF1, OFM1, OFBLT, OF1, and OFA-M1 series engineered for main distribution feeders up to 1600A.
OFW1 Intelligent Universal Circuit Breakers designed for high-capacity industrial power plants and low-voltage transformer secondary protection.
OFAP6-AC, OFDPN, OFDX, OFGX, OFID, OFL7, and OFPM series providing high-sensitivity earth leakage and shock protection (10mA - 300mA).
OFC, OFKL-80A, NB1L, OFMIN, OFOM, and OFR1 series combining earth leakage, overload, and short circuit protection into single compact housings.
OFIS-125A, OFIS-BH, and OFIS-DS series delivering robust physical separation and safety isolation during network maintenance routines.
Serving over 50 countries with verified performance across international trade events and infrastructure installations.
Flexible procurement models tailored for standardized stock replenishment or enterprise custom switchgear development.
Core Needs: Proven, stable solutions, rapid implementation, clear ROI, and easy maintenance. Applicable to commercial energy-saving retrofits and distributed PV grid tie panels.
Core Needs: High-reliability design with redundancy, seamless SCADA/DCS integration, full-cycle engineering collaboration for OEMs and panel builders.
See why global system integrators and electrical wholesalers rely on OFA for single pole MCBs and low-voltage distribution components.
"As a system integrator in Poland, we have collaborated with OFA on several industrial automation projects. Their product range is remarkably comprehensive, covering protective relays, single pole MCBs, and communication gateways. The product quality is consistent, significantly reducing on-site commissioning time."
"We purchased OFA's intelligent power monitoring and single pole miniature circuit breakers to upgrade our workshop distribution panels. Installation on standard DIN-rails went smoothly. Most importantly, they have operated flawlessly for over a year under heavy electrical loads."
"Deploying OFA's circuit protection and energy efficiency systems across several commercial office buildings in Bangkok was a wise decision. The clear technical documentation and rapid customer support made project execution simple and within budget."
"Our solar PV project in Chile required reliable circuit breakers capable of operating under high ambient temperatures. OFA's 1-pole MCBs met our strict technical criteria at competitive prices. Their engineers provided outstanding remote setup advice."
In-depth technical and commercial answers regarding Single Pole MCB selection, factory capabilities, and international logistics.
Complete your circuit protection selection with our specialized RCBO, DC, and 3-Pole MCB product lines.
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