Explore our core protective devices specialized for EV infrastructure, commercial power distribution, and renewable energy storage system integration.
Addressing the shifting paradigm toward 800V/1000V high-voltage DC fast charging systems, megawatt-level power cabinets, and continuous grid stability requirements.
As Electric Vehicle Service Equipment (EVSE) shifts from 400V to 800V and 1000V architecture, circuit breakers must clear persistent direct-current arcs. Specialized DC Molded Case Circuit Breakers (MCCBs) such as the DCOF1-250/PV provide ultimate short-circuit protection and reliable galvanic separation under harsh thermal dynamics.
Modern EV onboard chargers generate smooth continuous DC residual currents. Standard AC or Type A residual current devices (RCDs) become blind or saturated under 6mA DC leakage. Advanced Type B RCCBs and RCBOs ensure safety for human operators and prevent catastrophic insulation breakdown.
Unlike standard commercial loads, fast-charging EV stations operate at near 100% continuous rated load for hours. Dynamic thermal management, flame-retardant thermomagnetic trip housing, and silver-alloy contacts are critical to prevent nuisance tripping and premature contact welding.
Providing custom electrical protection configurations, supply chain transparency, and international compliance guarantees from China's electrical capital.
Every EV charging station grid connection brings distinct short-circuit ratings, ambient operating conditions, and enclosure dimensions. Wenzhou OFA Electrical Technology Co., Ltd. leverages modular design capabilities to deliver customized terminal allocations, tailored tripping curves (B, C, D curves), and white-label branding without compromising lead times.
Rooted in Yueqing, Wenzhou—the Capital of Electrical Appliances in China—OFA adheres strictly to ISO9001 certified manufacturing routines and IEC/EN standards (such as IEC 60947-2, IEC 61008-1, IEC 61009-1). Every component undergoes 100% full-process factory inspection verifying thermal trip precision, dielectric strength, and contact resistance.
Engineers can reference the operational parameters below to specify the appropriate device for AC wallboxes, DC fast chargers, and main distribution switchgear.
| Protection Category | Product Series | Rated Current (In) | Breaking Capacity (Icu/Icn) | Primary EV System Application |
|---|---|---|---|---|
| DC MCCB | OF1 / DCOF1-250/PV | 63A - 250A | Up to 25kA at 1000V DC | Ultra-Fast DC Fast Charger Main DC Busbar & Energy Storage Protection |
| High-Capacity MCCB | BA88-630E / OFM1 | 16A - 630A | 35kA - 50kA at 400V AC | Main Low-Voltage Distribution Switchboard for Multi-Bay Charging Hubs |
| Type B / High-Perf RCD | OFL7 / OFDX Series | 25A - 63A | 6kA / 10kA (Sensitivity 30mA/300mA) | AC Commercial Chargers (Mode 3) & Public EVSE Human Safety |
| Integrated RCBO | OFDPN / OFC Series | 6A - 40A | 6kA / 10kA | Compact Single-Phase & Three-Phase AC EV Charging Wallboxes |
| Industrial MCB | OFEU / OFDZ47 / OFKL | 1A - 63A | 6kA / 10kA | Auxiliary Control Circuit Protection, Metering Units & Cooling Pumps |
| Isolator Switch (IS) | OFIS-DS / OFIS-125A | 32A - 125A | N/A (Isolation Function) | Manual Emergency Disconnect & Maintenance Galvanic Isolation |
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. provides robust distribution switchgear and control components globally.
Our technical team constantly enhances low-voltage component longevity. Equipped with full-process type testing and factory inspection devices, we verify mechanical life, temperature rise limits, and arc extinguishing performance under full load.
With automated assembly equipment and digital inspection stations, every step from parts stamping to finished circuit breaker calibration operates under standardized SOPs to ensure minimal out-of-factory defect rates.
Rather than simply supplying modular devices, we provide integrated technical guidance—assisting integrators with short-circuit calculations, selective tripping coordination, and heat loss management for enclosed panels.
Pioneering active prediction, smart IoT communication, and solid-state arc extinguishing technologies for intelligent grid integration.
Integration of Modbus-RTU and RS485 communication into miniature breaker frames allows real-time telemetry of temperature, leakage currents, and operating cycles, enabling predictive maintenance before catastrophic trip events occur.
With Vehicle-to-Grid (V2G) technology rapidly advancing, circuit breakers must interrupt fault currents in both forward and reverse directions. Specialized magnetic blowout channels guarantee rapid arc extinction regardless of power flow direction.
Combining traditional mechanical galvanic gap isolation with fast-acting semiconductor switches enables microsecond-level fault clearance, minimizing voltage sags for adjacent high-speed DC charging modules.
Find authoritative answers regarding product selection, regulatory compliance, factory capabilities, and global project execution.
Discover how engineering teams across Europe, Asia, and the Americas partner with OFA for their electrical infrastructure deployments.
"As a European system integrator, sourcing reliable Type B RCCBs for public AC charger installations was critical. OFA’s OFL7 series passed our internal thermal stress tests with flying colors, and their engineering team provided clear documentation."
"We integrated OFA's DCOF1-250/PV DC MCCBs into our 180kW fast-charging stations. The performance under high continuous ambient temperatures has been rock solid, completely eliminating nuisance tripping."
"OFA’s quick turn-around on OEM branding and flexible order quantities allowed us to deploy our solar-powered charging hub project ahead of schedule. Their cost-to-performance ratio is unmatched."
Comprehensive switchgear, residual current breakers, and molded case circuit protection manufactured to international precision standards.
Partner with Wenzhou OFA Electrical Technology Co., Ltd. for engineering alignment, factory-direct OEM pricing, and rapid prototype validation for your low-voltage power distribution systems.
Request Engineering Quotation
OFA Electrical
