Explore our flagship high-performance Earth Leakage Circuit Breakers (ELCB/RCCB/RCBO) and modular low-voltage protective devices engineered for ultimate system reliability.
Addressing modern electrical infrastructure risks with advanced residual current detection technology, robust arc extinction, and resilient low-voltage switchgear.
The global shift toward high-efficiency industrial automation, frequency converters, variable-speed drives (VSD), and renewable power inverters has introduced complex high-frequency harmonics and smooth DC leakage currents into modern distribution networks. Conventional Type AC earth leakage breakers frequently experience nuisance tripping or dangerous blindness during real fault events. The OFKL-80A Series utilizes advanced zero-sequence toroidal transformer cores and electromagnetic filtering mechanisms capable of detecting both sinusoidal AC and pulsating DC residual currents, guaranteeing unwavering protection across modern automated industrial facilities.
Electrical leakage remains a leading cause of industrial fires globally, often triggered by gradual insulation breakdown in cabling, motor windings, and outdoor terminal boxes. The OFKL-80A series offers selectable residual operating sensitivities ranging from high-sensitivity personal safety levels (30mA instantaneous trip under 30ms) to sub-distribution fire-prevention levels (100mA, 300mA, and 500mA time-delayed tripping). Operating across 2-Pole (2P) and 4-Pole (4P) configurations up to 80A rated current, it acts as an unyielding firewall against thermal degradation and dangerous shock hazards.
Meticulously constructed according to IEC/EN 61008-1 standards, ensuring maximum breaking capacity, thermal stability, and mechanical endurance.
| Technical Parameter | OFKL-80A 2P Specification | OFKL-80A 4P Specification | Engineering Compliance Standard |
|---|---|---|---|
| Rated Current (In) | 16A, 25A, 32A, 40A, 63A, 80A | 16A, 25A, 32A, 40A, 63A, 80A | IEC 61008-1 / EN 61008-1 |
| Poles Configuration | 1P+N / 2P | 3P+N / 4P | Single-Phase & Three-Phase Systems |
| Rated Operating Voltage (Ue) | AC 230V / 240V (50/60Hz) | AC 400V / 415V (50/60Hz) | Global Low-Voltage Grid Standard |
| Residual Current Type | Type AC, Type A (Pulsating DC Sensing) | Type AC, Type A, Type S (Time-Delayed) | IEC 60755 Waveform Standards |
| Rated Residual Sensitivity (IΔn) | 30mA, 100mA, 300mA | 30mA, 100mA, 300mA, 500mA | Human Protection & Fire Mitigation |
| Short-Circuit Capacity (Inc/Ic) | 6,000A / 10,000A (With Backup fuse) | 6,000A / 10,000A (With Backup fuse) | GB/T 16916.1 Industrial Grade |
| Insulation Voltage (Ui) | 500V | 500V | Overvoltage Category III |
| Mechanical & Electrical Life | 20,000 Mechanical / 10,000 Electrical | 20,000 Mechanical / 10,000 Electrical | Heavy Industrial Duty Standard |
| Terminal Connection Type | Tunnel Terminal (Up to 35mm² cable) | Tunnel Terminal (Up to 35mm² cable) | Copper Busbar & Cable Compatible |
Utilizes ultra-pure silver-alloy contact tips combined with a multi-plate arc chute array. Upon detecting earth fault leakage, the internal polarized vector trip mechanism releases within 30 milliseconds, dampening high-energy arc flash events instantly.
Encapsulated in custom-formulated polycarbonate (PC) and PA66 thermo-plastics rated at UL94-V0. Operates reliably under ambient temperature extremes from -25°C to +60°C without mechanical distortion or dielectric creepage.
Equipped with bi-stable DIN-rail mounting clips for rapid, tool-free installation on standard 35mm top-hat rails. Features intuitive green/red mechanical contact status indicators for direct visual verification of circuit safety.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is strategically rooted in Yueqing, Wenzhou — widely recognized as the Capital of Electrical Appliances in China. Over a decade of steadfast commitment to innovation, lean manufacturing, and customer service has elevated OFA into a benchmark supplier of distribution switchgear, control equipment, and low-voltage electrical protection systems.
Holding independent proprietary brands such as "OFA", our products serve critical infrastructure spanning electrical power grids, solar renewable energy installations, industrial automation plants, commercial property, and specialized equipment manufacturing worldwide.
Automated Breaker Calibration & Assembly
High-Precision Electrical & Dielectric Testing
Final Quality Inspection & Export Packaging
Wenzhou OFA delivers systematic power management solutions. Beyond the OFKL-80A ELCB series, our specialized product categories support seamless modular integration across all low-voltage architectures.
Engineered for primary sub-station protection, handling rated currents up to 630A and breaking capacities up to 50kA. Protects heavy feeder lines against overload, short-circuit, and undervoltage faults (Includes BA88, DCM1, DCOF1, and OFA-M1 series).
Compact modular circuit guardians for commercial panels and branch circuits. Available in 1P, 2P, 3P, and 4P configurations with B, C, and D tripping curves up to 63A/125A (Includes OF6KA, OF10KA, OFL8, OFKL-NXB series).
Designed for main incoming power distribution units up to 6300A. Features micro-processor smart trip units, dual communication ports (Modbus/Profibus), and remote telemetry capabilities for smart grid integration.
Pure earth-fault protection switches (including OFKL-80A, OFPM, OFID, and OFAP6 series). Provides precise vector sum sensing without overcurrent trip units, ideal for dedicated earth leakage isolation.
Combines overload, short-circuit, and earth leakage protection into a single 1P+N or 3P+N enclosure, optimizing panel board space (Includes OFR1, NB1L, OFC, and OFMIN series).
Heavy-duty load break switches designed for positive contact disconnect during maintenance. Supports high withstand currents up to 125A with lockable padlock handles for safety lockout/tagout (LOTO).
The OFKL-80A Series and accompanying switchgear are specifically adapted for challenging operational environments worldwide.
Solar inverters generate high frequency leakage currents and potential DC components. OFKL-80A Type A residual current breakers effectively prevent false tripping while protecting maintenance personnel working around transformerless PV grid-tie systems.
Electric Vehicle Supply Equipment (EVSE) demands rigorous electrical safety. Deploying 4P OFKL-80A earth leakage devices in AC wallbox chargers and fast-DC pedestal distribution panels ensures immediate cutoff upon insulation breakdown.
Uninterruptible Power Supplies (UPS), server racks, and automated CNC machinery cannot tolerate unprogrammed power outages. OFKL-80A time-delayed (Type S) breakers deliver selective discrimination, isolating faults locally without shutting down main supply lines.
Partner with Wenzhou OFA to customize electrical protection hardware tailored to your precise market voltage, branding, and packaging specifications.
Consultation on voltage ratings (110V/230V/400V), frequency (50/60Hz), tripping curves, and target market certifications (CE/CB/UL/SASO).
Custom housing laser-marking, private label branding, terminal screw adaptations, and specialized packaging design provided by OFA R&D.
Full verification of temperature rise, mechanical life, short-circuit breaking capacity, and dielectric strength under lab conditions.
Flexible production lines guarantee rapid execution of both high-volume standardized orders and custom turnkey project batches.
See why panel builders, EPC contractors, and electrical distributors across 100+ countries rely on Wenzhou OFA Electrical Technology Co., Ltd.
"As a system integrator in Poland, we collaborated with OFA on multiple industrial automation projects. The OFKL-80A series residual current breakers exhibit zero false-tripping on high-frequency VFD loads, simplifying our commissioning tremendously."
"We purchased OFA's intelligent protection switchgear and earth leakage breakers to upgrade our workshop distribution boards. Over two years of operation without a single defect. Clear technical documentation and flawless compliance."
"For our utility solar energy installation in Chile, ambient thermal stability and remote engineering support were crucial. OFA supplied OEM customized 4P residual breakers that met all IEC standards with fast air shipment."
Find expert answers regarding selection, application guidelines, quality standards, and OEM cooperation for the OFKL-80A series.
Explore additional high-performance low-voltage protective devices engineered by Wenzhou OFA Electrical Technology Co., Ltd.
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