The modern industrial power landscape demands absolute stability, particularly within the mid-range current ratings where a major portion of main and sub-distribution operations occur. The 320 Amp Molded Case Circuit Breaker (MCCB) serves as a critical node in low-voltage distribution networks. Engineered to sit perfectly between standard light-commercial panels and heavy-duty mains, these breakers are designed to isolate electrical faults, protect downstream motors and machinery, and maintain the continuity of critical power paths.
From an engineering perspective, a 320A MCCB must handle substantial thermal loads and electromagnetic stresses. Under nominal operating conditions, internal bimetallic elements continuously monitor the thermal characteristics of the circuit. In the event of an overload, the deflection of this bimetal triggers the trip mechanism. For instantaneous short-circuit protection, advanced magnetic coils or electronic microprocessors (LSIG trip units) detect rapid current spikes, ensuring safe contact separation within milliseconds. As a reliable manufacturing partner, Acereare Electric integrates premium metallurgy and precise mechanical calibration to ensure these systems function flawlessly over thousands of operations.
China's power electronic manufacturers have transitioned from manufacturing basic thermal-magnetic units to pioneering sophisticated electronic switchgear systems. Key improvements include:
Acereare Electric, founded in 2015, has developed into an industry leader through its two wholly-owned subsidiaries, RuiRui Electric and KeRui Electric. As a professional original manufacturer integrating R&D, production, and sales, we specialize in high-performance molded case circuit breakers (MCCB), air circuit breakers (ACB), and premium copper/iron components. Our operations are backed by over 20 years of manufacturing craftsmanship inherited across generations, establishing a solid foundation for our industrial output.
Ranking among the top ODM/OEM manufacturers in China, Acereare operates two production plants to handle component stamping and final product assembly. By linking all manufacturing processes through integrated enterprise resource planning systems (PLM, BI, ERP, and MES), we ensure each circuit breaker is manufactured with precise quality control and traceablity.
Adhering to the core value of win-win cooperation, we have built a solid reputation among our customers for outstanding service, first-class products, and unbeatable prices.
One-Stop Service Six kinds of Processing Technic, High precision production equipment and testing instruments, More than 10 manual and automated production lines.
More than 50 R&D engineers with over 5 years of work experience, Familiar with 3D software design of parts, molds, and finished machine drawings, 50+ research and development projects per year.
Owning two factories to expand the production of components and complete machines, Integrate management by linking various processes and departments through ERP and U8 software.
A rigorous and multi-step quality inspection process, Owning its own laboratory to test the quality of parts, More than 150 sets of testing instruments and over 20 inspectors, Control quality through software such as PLM/BI/ERP/MES.
For industrial buyers, EPC contractors, and electrical panel builders, selecting a 320 Amp circuit breaker is not just about current rating. The operating environment requires careful examination of critical engineering metrics:
| Rated Current ($I_n$) | 320 Amps |
| Rated Operational Voltage ($U_e$) | AC 400V / 690V |
| Rated Insulation Voltage ($U_i$) | 800V / 1000V |
| Rated Impulse Withstand Voltage ($U_{imp}$) | 8kV |
| Breaking Capacity ($I_{cu}$ at 400V) | 35kA / 50kA / 85kA |
| Standards Compliance | IEC 60947-2, GB/T 14048.2 |
Modern electrical infrastructure operates in challenging conditions globally. Acereare Electric provides tailored engineering solutions to ensure circuit breaker reliability across diverse environmental conditions:
For installations in sub-zero climates, we utilize specialized low-temperature resistant structural resins and low-viscosity lubricating oils. Our component metal parts are treated with thick coatings to maintain reliability, backed by certification reports down to -40°C.
Offshore wind farms, seaport terminal machinery, and cargo vessels require specialized anti-corrosion protection. We conduct 72-hour salt spray testing on complete machines and 48-hour testing on semi-complete assemblies. This ensures reliable operation under coastal conditions, preventing corrosion-induced contact failures.
At elevations exceeding 2,000 meters above sea level, thin air reduces both dielectric strength and thermal heat dissipation. We supply high-altitude correction matrices to help system design engineers adjust nominal ratings for performance at up to 5,000 meters.
In residential buildings and commercial properties, MCCBs act as safety controllers protecting against line faults. Their robust design reduces fire risk and helps prevent electrical equipment damage from grid overloads.
In heavy industries like steel mills and desert solar installations, temperatures can rise significantly. We use high-temperature resistant engineering polymers and apply thermal barriers to controllers. Performance is verified through testing in our 55°C environmental chambers.
Our intelligent MCCB designs feature built-in voltage and current sensors, enabling remote metering, telemetry, and edge-computing. These breakers communicate via standard protocols to interface directly with SCADA systems and building management networks.
Acereare Electric has established strategic partnerships with nearly 100 high-end customers globally. Our manufacturing center is equipped with high-precision fabrication tooling, semi-automated assembly lines, and specialized calibration testing systems. We produce reliable circuit breakers that comply with major international electrical safety standards.
We design and manufacture diverse circuit breakers and distribution accessories. Our product portfolio includes:
Our ARW1 series air circuit breaker is designed for AC 50Hz networks with rated voltages up to 690V and currents from 400A to 6300A. It provides high-precision selective protection to improve power supply reliability. Equipped with an open communication interface, it supports standard telemetry, remote adjustment, remote control, and remote signaling functions required for modern automation systems.
We work with global brands to supply custom electrical hardware, offering:
Our engineering team handles full-cycle product design and manufacturing, including:
We supply modular, pre-engineered solutions ready for market integration, featuring:
From initial design inquiry to shipping and field support, Acereare provides an structured project flow:
We review your specific project requirements, electrical parameters, environmental challenges, and certification needs to recommend the ideal breaker model.
Our R&D team provides drawings, circuit diagrams, and material specs, ensuring the breakers integrate cleanly into your existing switchgear designs.
We finalize technical sheets, confirm delivery schedules, define warranty terms, and establish quality standards before contract signing.
Breakers are assembled using automated lines, followed by comprehensive testing of trip limits, insulation resistance, and dielectric performance.
Products are packed in export-grade crates and coordinated for delivery to minimize transit times and ensure damage-free arrival.
Acereare circuit breakers are certified to meet major international standards. Our manufacturing facilities are ISO 9001, ISO 14001, and ISO 45001 certified. The gallery below displays our quality compliance documentation:
Our technical team answers common questions regarding MCCB selection, maintenance, and system design:
AceReare
