Explore our industrial-grade Molded Case Circuit Breakers (MCCB), precision components, and customized ODM solutions for 800V-1140V electrical distribution systems.
The global transition of utility-scale solar PV systems to 1500V DC operating voltages has directly driven the adoption of 800V AC (and up to 1140V AC) topologies on the output of string inverters. By upgrading inverter output voltages from the traditional 400V/690V AC to 800V AC, engineering, procurement, and construction (EPC) companies drastically optimize system layout performance.
This critical architectural pivot reduces cable conductor sizes, minimizes power losses (thanks to lower currents at higher operational voltages), and lowers overall installation labor costs. However, running at 800V AC introduces severe electrical challenges, demanding circuit protection devices that can break critical overloads and short circuits under high dielectric stresses.
To safely handle high-energy electrical faults in these systems, modern Molded Case Circuit Breakers must offer high isolation voltages ($U_i$ up to 1250V) and robust impulse withstand voltages ($U_{imp}$ of 8kV to 12kV), preventing transient voltage surges from damaging expensive upstream transformers or downstream inverter modules.
Founded in 2015 with wholly-owned subsidiaries RuiRui Electric and KeRui Electric, we inherit over 20 years of craftsmanship across two generations in circuit breaker R&D and production.
Our status as a top-tier ODM manufacturer in China is backed by strict compliance with global standards, comprehensive laboratory test setups, and a vertical manufacturing integration model that allows us to build everything from precision metal stamping and contacts to completed molded case circuit breakers and air circuit breakers.
An in-depth look at key parameters and why dedicated solar breakers are required for high-voltage PV grids.
| Feature Parameter | Standard Commercial Breaker | Solar Specific 800V MCCB (e.g., ARM3E / ARXM3) | Engineering Benefit |
|---|---|---|---|
| Rated Operational Voltage ($U_e$) | Up to 400V / 690V AC | 800V / 1000V / 1140V AC & DC | Supports high-voltage string inverter outputs directly without derating. |
| Insulation Voltage ($U_i$) | 690V - 800V | 1000V - 1250V | Ensures dielectric reliability and safe physical isolation during maintenance. |
| Rated Impulse Withstand ($U_{imp}$) | 6kV - 8kV | 8kV - 12kV | Safeguards circuits against high-voltage lightning strikes and grid transients. |
| Trip Unit Technology | Thermal-Magnetic (fixed) | Electronic / Microprocessor (LSIG Adjustable) | Provides selective coordination to prevent nuisance tripping and limit fire hazards. |
| Ambient Operating Range | -20°C to +40°C | -40°C to +55°C (Up to +70°C with derating) | Essential for desert-based utility-scale PV farms and cold montane installations. |
Our circuit breakers are built to withstand extreme environmental challenges, providing reliable circuit protection in all climates.
Utilizing low-temperature resistant structural resins, specific low-viscosity mechanical oils, and thickened anti-corrosive coatings. Supported by independent lab test reports down to -40℃.
Capable of enduring up to 72 hours of salt spray testing for complete machines and 48 hours for semi-assemblies. Ideal for offshore floating solar arrays, coastal installations, and port systems.
Designed for environments above 2000 meters. We provide technical clearance charts and altitude coefficient adjustments to account for reduced air density and lower thermal dissipation.
Ensuring absolute protection for heavy residential loads, smart energy management centers, and local EV charging terminals against short-circuit hazards and current overloads.
Manufactured using heat-resistant thermal resins. Internals are coated with specialized heat dissipation layer. Tested continuously in our dedicated 55℃ environmental chambers.
Equipped with microprocessors for edge computing, high-precision circuit metering, remote operation signaling, and protocols (Modbus, RTU) matching modern smart grid demands.
Our state-of-the-art facilities ensure reliability and quality for our global customers.
One-Stop Service utilizing six key manufacturing technologies. Highly precise machining tools combined with over 10 manual and automated assembly lines guarantee consistent high-volume delivery.
More than 50 engineers with over 5 years of industry experience. Expertise in full 3D CAD modeling, FEA mechanical analysis, and thermal simulation. Running 50+ projects annually.
Operating two large-scale factories for raw material and completed components. Our processes are linked via ERP and U8 software management systems to reduce processing lead times.
Robust testing setups with 150+ testing instruments and 20+ specialized inspectors. Supported by PLM, MES, and ERP management systems to guarantee flawless traceabilities.
A reliable supplier accelerates market entry, builds high customer retention, and increases revenue margins.
Our branding support enables partners to build unique brand identities while maintaining top-tier quality standards. We offer customized laser logo engraving, trademarked shipping packaging designs, and complete product catalogs to scale your brand in the low-voltage industrial space.
Our team works closely with engineering departments to design, simulate, and manufacture custom electrical devices. We handle the process from 3D CAD modeling to international certifications, acting as your trusted overseas manufacturing partner.
Our manufacturing and testing standards comply with the rigorous requirements of safety testing bodies worldwide.
A structured workflow ensures high accuracy, reliable quality, and fast delivery timelines.
We analyze your system requirements and specify the appropriate voltage levels and interrupting ratings ($I_{cu}$).
Our engineers develop 3D structural drawings, select appropriate trip units, and configure mounting brackets.
We finalize target specifications, quality metrics, lead times, and financial terms.
We manufacture the units using MES tracking, followed by continuous load testing and safety checks.
We handle customs documentation, packaging, and coordinate fast shipment to your warehouse.
Expert answers to common engineering and procurement questions regarding 800V Molded Case Circuit Breakers.
A: Operating at 800VAC allows PV system designers to scale up the voltage rating on the AC side of central/string inverters. According to Ohm's law, a higher voltage reduces system currents, which limits thermal dissipation ($I^2R$). This allows for smaller cable cross-sections, lowering copper conductor costs and installation labor. Using dedicated 800VAC MCCBs (like our ARM3E series) ensures your system has the required dielectric isolation and arc-extinguishing capabilities to handle these high-voltage faults safely, preventing nuisance trips and minimizing fire hazards.
A: At altitudes exceeding 2000 meters, the air becomes less dense. This reduction in air density decreases the dielectric properties of air and reduces convective heat dissipation. Consequently, circuit breakers require appropriate derating coefficients for operational current ($I_e$) and insulation voltage ($U_i$). Acereare provides detailed derating factors and tables to adjust these thresholds, ensuring safe and reliable operation of our MCCBs in high-altitude montane solar applications.
A: All our molded case circuit breakers and air circuit breakers undergo testing according to global low-voltage equipment criteria, including IEC 60947-2 (standard for circuit breakers) and corresponding Chinese GB 14048.2 guidelines. We offer certified test reports (CE, CB, TUV) and utilize an in-house testing facility equipped with over 150 testing instruments, checking parameters like mechanical life cycles, dielectric withstand, short-circuit interrupting capacity, and thermal-magnetic calibration curves.
A: Yes, we offer comprehensive OEM and ODM branding services. This includes custom laser logo engraving on the breakers, custom authorized packaging designs (inner cartons and shipping boxes), and customized catalog design. We support lower minimum order quantities (MOQ) for initial orders to help you introduce new products to your target markets.
A: Vertical integration allows us to manufacture crucial internal components (such as silver-alloy moving contacts, copper busbars, and stamped steel parts) in-house. This gives us full control over raw material quality, minimizes sub-component delays, and lowers production costs. By avoiding third-party part markups, we pass those cost savings to our buyers, providing high-quality circuit breakers at competitive wholesale prices.
Complete your layout design with high-quality components, drawer bases, and wide-range air circuit breakers.
AceReare