Explore our leading catalog of industrial molded case circuit breakers and air circuit breakers direct from China's premier manufacturer.
Modern electrical infrastructure is undergoing a massive transformation. Power grids must handle complex loads, fluctuating renewable inputs, and localized industrial surges. The Molded Case Circuit Breaker (MCCB) 400A occupies a critical junction in this new paradigm. Positioned as a fundamental tier in primary and secondary distribution boards, 400A MCCBs deliver essential safety, selective isolation, and smart telemetry capabilities.
Globally, sectors such as renewable energy storage systems (BESS), heavy manufacturing, hyperscale data centers, and marine infrastructures demand equipment that can clear faults reliably at higher voltage ratings (such as 690V and up to 1140VAC/1500VDC). High breaking capacities—often peaking at 200kA Icu—ensure that catastrophic faults do not translate to long-term operational downtime or asset loss.
Founded officially in 2015, Acereare Electric operates through its two wholly-owned subsidiaries, "RuiRui Electric" and "KeRui Electric". Drawing upon over 20 years of craftsmanship inherited through two generations of engineers, we provide a sophisticated, vertically-integrated ODM/OEM structure designed to support high-end global markets.
We are a professional original manufacturer integrating research, development, assembly, and testing of molded case circuit breakers (MCCBs), air circuit breakers (ACBs), and associated components. Through continuous strategic expansion and capital investments, our factories have scaled to support international supply chains with zero compromise on system protection.
How our vertically integrated facility optimizes cost, lead times, and technological precision.
We boast six kinds of internal processing techniques, high-precision tooling equipment, and over 10 manual and automated assembly lines that prevent bottlenecks in component manufacturing.
Our engineering team handles full 3D CAD design of parts, intricate molds, and finalized mechanisms, allowing us to roll out 50+ custom research and development projects every year.
Equipped with more than 150 dedicated testing instruments and 20 quality inspectors, we continuously monitor production lines via integrated PLM, ERP, BI, and MES management software.
Custom designs customized for the world's most severe operational environments, verified under strict laboratory criteria.
Constructed with specialized low-temperature resistant materials and anti-freezing oils. Features thickened anti-corrosive structural coatings with certified performance indicators valid down to -40℃.
Designed to withstand coastal humidity and high-salt air. Confirmed with 72-hour complete machine and 48-hour sub-assembly salt spray test validations to guarantee protection for dock cranes and ship motors.
For operations located above 2,000 meters, we provide precise electrical coefficient adjustments using our specialized high-altitude derating data tables to ensure reliable dielectric performance.
Ensuring maximum safety for critical systems and domestic equipment. Offers adjustable magnetic/thermal boundaries that significantly reduce false tripping and increase uptime.
Engineered with thermal isolation layers and custom copper treatments for sub-tropical or furnace installations, fully tested inside constant-temperature chambers at 55℃.
Supports state-of-the-art communication interfaces, smart metering modules, edge computing telemetry, and remote activation signaling to interface directly with power automation platforms.
We provide full-spectrum engineering services to help industrial projects and hardware distributors capture target market share efficiently. By using premium materials and optimized component configurations, we guarantee stable hardware lifespans.
We apply custom laser engraving for logos, tailor user manuals, and construct custom internal and external box packaging. We also support short-run sample production to assist with local certification approvals.
Our facility designs and constructs dedicated product molds, develops targeted micro-controller configurations, and supports 24-hour engineering responses. We function as your trusted overseas manufacturing base.
In-depth technical answers addressing circuit breaker topologies, breaking thresholds, and thermal adjustments.
A thermal-magnetic trip unit utilizes a bimetallic strip to protect against long-term overloads (thermal threshold) and an electromagnetic coil to protect against short circuits (magnetic threshold). It is a reliable, analog choice. An electronic trip unit (such as the LSIG system in our ARM3E series) uses internal current transformers to measure system waveforms. It offers highly adjustable settings for Long-time delay (L), Short-time delay (S), Instantaneous pickup (I), and Ground fault protection (G), providing superior selectivity in complex industrial setups.
At elevations higher than 2,000 meters above sea level, the thinner atmosphere reduces both the air's cooling efficiency and its dielectric strength. This leads to reduced heat dissipation and lower insulation performance. To operate safely without overheating or internal arcing, the circuit breaker's rated operating current (Ie) and rated operating voltage (Ue) must be multiplied by corresponding derating factors (e.g., derating current capacity by 5% to 10% depending on exact height measurements).
Icu (Ultimate Short-Circuit Breaking Capacity) represents the maximum current a circuit breaker can interrupt safely twice without destruction. Ics (Service Short-Circuit Breaking Capacity) indicates the maximum current level the breaker can interrupt and still remain operational. An Ics ratio of 100% (Ics = Icu) demonstrates high-quality manufacturing, ensuring the device remains functional even after clearing a severe fault.
Standard AC molded case circuit breakers cannot interrupt high-voltage DC solar faults safely. For solar PV installations, specialized PV-rated breakers (such as our high-voltage 800VAC to 1140VAC/1500VDC options) must be used. These feature specialized contact layouts and magnetic runners that extinguish continuous DC arcs rapidly, protecting downstream combiners and central inverters.
Browse our specialized component offerings, mechanical operators, and high-breaking capacity units.
AceReare
