Explore our certified product portfolio manufactured at our Wenzhou facility, matching global OEM specifications and international safety standards.
In modern industrial automation, process control systems, and renewable energy architectures, 24V Direct Current (24VDC) serves as the backbone power bus for programmable logic controllers (PLCs), human-machine interfaces (HMIs), sensors, and smart actuators. Providing continuous, uninterruptible operation requires specialized circuit breakers engineered to manage the physical characteristics unique to DC arc suppression.
Unlike Alternating Current (AC) which naturally crosses a zero-voltage point 100 or 120 times per second, 24VDC provides continuous current flow. When contacts open under load, a sustained electric arc is formed. Our 24VDC circuit breakers incorporate permanent magnetic blow-outs and extended arc chutes designed to stretch, cool, and extinguish DC arcs rapidly within milliseconds.
Switching power supplies used in 24VDC control circuits often feature internal current limiting. Standard thermal-magnetic breakers may fail to trip quickly enough during short circuits due to voltage drop across long wire runs. OFA's optimized trip curves (B, C, and fast-acting Z profiles) ensure rapid response even under limited short-circuit currents.
Miswiring during rapid field installation can permanently damage directional DC breakers. OFA engineers bi-directional, non-polarized magnetic blow-out systems across selected MCB and MCCB series, providing 100% protection regardless of line/load wiring orientation.
| Electrical Parameter | Industrial Automation Standard | Solar / Telecom DC Standard | OFA Heavy-Duty Industrial Spec |
|---|---|---|---|
| Nominal Operational Voltage (Ue) | 24 VDC (18V - 30V Range) | 48 VDC / 110 VDC / 250 VDC | Up to 1000 VDC (Multi-pole series) |
| Rated Current Range (In) | 0.5A - 63A | 16A - 250A | 0.5A up to 630A (MCCB Series) |
| Ultimate Breaking Capacity (Icu) | 4.5 kA at 24VDC | 6 kA / 10 kA | 10 kA - 25 kA (IEC 60947-2) |
| Tripping Curve Options | Curve B (3-5 In), Curve C (5-10 In) | Curve C, Curve D (10-14 In) | Fast Z (2-3 In), B, C, D Custom Profiles |
| Mechanical / Electrical Life | 10,000 / 4,000 Operations | 15,000 / 6,000 Operations | 20,000 / 10,000 Operations |
| Protection Degree & Mounting | IP20 DIN-Rail 35mm | IP20 DIN-Rail / Base Plate | IP40 Front Panel, IP20 Terminals |
Rooted in Yueqing, Wenzhou — recognized worldwide as the Capital of Electrical Appliances in China — Wenzhou OFA Electrical Technology Co., Ltd. has established itself over a decade as a trusted OEM & ODM manufacturer of distribution switchgear and circuit control equipment.
Situated in China's dense low-voltage electrical ecosystem, OFA leverages direct vertical integration for raw silver contacts, arc chutes, thermal bimetals, and precision molded housing. This proximity eliminates supply disruption risks and allows us to deliver high-performance breakers at optimized cost structures.
Our automated assembly lines integrate digital calibration stations to test instantaneous magnetic tripping, temperature rise under rated load, and dielectric withstand strength. Every single breaker batch receives complete traceable serial verification before packing.
From private-label branding, customized current ratings, and specialized trip curves to tailored packaging and laser engraving, OFA provides global system integrators and distributors with end-to-end custom production capabilities with low minimum order quantities.
In addition to specialized 24VDC miniature circuit breakers, OFA manufactures a complete range of low-voltage control and protection equipment for diverse global industrial requirements.
Engineered to make, carry, and break currents under normal conditions and safely interrupt heavy short-circuit currents in main distribution switchboards up to 630A. Features BA88, DCM1, DCOF1, OFM1, and OFA-M1 series.
Terminal distribution protectors designed for space-saving panel installations. Protects branch circuits against overload and short circuits. Includes OF6KA, OF10KA C65, OFAFT, OFEU, OFKL, and OFL7 series.
Intelligent Universal Circuit Breakers (OFW1 Series) designed as primary protection devices in large commercial buildings, industrial power grids, and main transformer output panels up to 6300A.
Specialized earth leakage and ground fault breakers (OFPM, OFDPN, OFDX, OFC, NB1L) combining overload, short-circuit, and high-sensitivity electrical shock protection into unified compact modules.
Heavy-duty load disconnectors (OFIS-125A, OFIS-BH, OFIS-DS) designed for safe physical circuit isolation during maintenance and switching operations in automation and solar PV combiner boxes.
Deploying 24VDC circuit breakers demands tailored engineering solutions across diverse global operating environments and industrial infrastructure sectors.
In automated manufacturing plants, 24VDC switch-mode power supplies energize complex networks of PLCs, sensors, solenoid valves, and relay modules. Installing OFA fast-tripping 24VDC MCBs prevents single-sensor short circuits from causing total power supply shutdown, isolating localized faults seamlessly.
Off-grid and grid-tied solar systems rely on 24VDC / 48VDC auxiliary battery circuits for battery management system (BMS) controllers and inverter communication cards. OFA DC breakers guarantee safe overcurrent isolation, preventing thermal runaway hazards in lithium battery enclosures.
5G cellular towers and telecom central offices operate on continuous -24VDC or -48VDC battery backup banks. Our high-reliability breakers feature low internal resistance to minimize voltage drop and maintain full power integrity across sensitive communication hardware.
Logistics robots and AGVs utilize internal 24VDC motor drives and navigation controllers. OFA's compact, vibration-resistant breakers prevent short-circuit damage caused by mechanical shock or cable harness chaffing during continuous mobile operation.
Commercial DC Fast Chargers rely on dedicated 24VDC power supply units to power internal microcontrollers, RFID card readers, touchscreen displays, and safety contactors. OFA breakers ensure continuous uptime and safe fault isolation for critical EV infrastructure.
Modern high-efficiency data centers utilize localized 24VDC rack power distribution architectures to eliminate AC conversion losses. OFA breakers deliver precision trip sensitivity to safeguard high-density server blades and switchgear.
All OFA electrical components comply fully with key international market entry standards, including CE (LVD/EMC), IEC 60947-2, IEC 60898-2, CCC, and RoHS compliance. We provide complete technical data packages, CAD drawings, step files, type test reports, and customized labeling (custom language, customized laser logo, barcoding) to support seamless regulatory approvals for OEMs worldwide.
From traditional thermal-magnetic protection to smart IoT-enabled DC microgrids, the low-voltage sector is rapidly evolving towards predictive energy management.
Modern DC architectures demand microsecond fault clearance times. OFA is pioneering hybrid electronic and solid-state DC breaker designs incorporating real-time telemetry, remote Modbus/RS485 reporting, and active short-circuit prediction.
With the expansion of commercial solar PV, battery storage, and direct DC industrial equipment, building microgrids are bypassing AC infrastructure. Higher-voltage DC breakers (up to 1000VDC) and 24V auxiliary units are becoming mandatory standard gear.
Aligning with global green building standards, OFA utilizes 100% recyclable halogen-free thermoplastics, RoHS-compliant lead-free silver alloys, and energy-efficient manufacturing processes across all Yueqing assembly lines.
Review specifications, load characteristics (voltage, operating current, short-circuit current), and operating environment.
OFA technical team verifies trip curves, terminal configurations, dielectric spacing, and sends CAD drawings & samples.
Automated assembly with 100% routine testing, temperature rise validation, and complete traceable batch quality checks.
Fast international logistics, complete custom documentation, warranty support, and long-term supply continuity.
Discover why industrial equipment manufacturers and power engineers across 50+ countries trust OFA for their critical power distribution needs.
"As a system integrator in Poland, we collaborated with OFA on several industrial panel projects. Their product range is remarkably complete—from specialized 24VDC MCBs to communications gateways. Product quality is consistent, eliminating on-site commissioning delays."
"We deployed OFA intelligent power monitoring devices to upgrade our workshop distribution panels. Installation on 35mm DIN rails was fast, and integration went smoothly. Running stably for over a year with clear technical documentation."
"Deploying OFA's energy management breaker solutions for our commercial building facilities was a great decision. The clear current trip accuracy helped us optimize operational strategies. Online technical support is fast and effective."
"Our solar project required high-reliability DC breakers adapted to extreme outdoor ambient temperatures. OFA's products met our core technical specs at a competitive direct factory price. Their engineers provided outstanding support."
Expert answers to common engineering, procurement, and technical selection questions regarding 24VDC circuit protection equipment.
Discover our additional industrial-grade low voltage devices manufactured to strict ISO9001 and international type-test standards.
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