Ceramic Body for Fuse Bolted Series Industry Knowledge

In new energy circuit protection systems, the ceramic body for the Fuse Bolted Series serves as the fuse's "protective core," a key component that balances insulation performance, thermal stability, and mechanical strength. From the high-voltage circuits of electric vehicles to the DC systems of photovoltaic energy storage, its performance directly determines the fuse's response speed and protection reliability under extreme operating conditions. The following analyzes core industry knowledge and technical key points from the perspectives of material properties, performance logic, application scenarios, manufacturing standards, and technological trends.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The material selection for the Ceramic Body for Siemens LV HRC Fuse must meet the triple requirements of "insulation first, temperature resistance as the core, and strength as the foundation." This determines its core value in complex circuit environments. The industry mainstream uses 95% alumina ceramics and beryllium oxide ceramics as substrates. These two materials form a complementary technical solution. Alumina ceramics (Al₂O₃), with an insulation resistance exceeding 1000MΩ and a flexural strength of 300MPa, are the preferred choice for balancing insulation and mechanical properties. In the high-voltage battery circuit of electric vehicles, its insulation resistance ensures a leakage current of ≤1μA at 1000V, well below the safety threshold. Beryllium oxide ceramics (BeO), with a high thermal conductivity of 280W/(m・K) (approximately five times that of alumina), are suitable for scenarios requiring rapid heat dissipation, such as the high-frequency fuse circuits of photovoltaic inverters, where they can control the local temperature rise at the moment of melting to within 50°C. Material purity and sintering process directly impact performance limits: EV Fuse Ceramic Body requires sintering at 1600°C to achieve a density exceeding 3.85g/cm³, ensuring insulation resistance stability. Beryllium oxide ceramics must maintain an impurity content of ≤0.5% to prevent thermal conductivity degradation due to lattice defects. Surface treatment is also crucial. Precision grinding (roughness Ra ≤ 0.8μm) reduces electric field concentration and improves withstand voltage by 20%, which is crucial for safe operation in high-voltage applications (such as circuits above 400V).

 

 

The performance parameter design of the Ceramic Body for EV Fuse is always closely aligned with the electrical requirements of downstream applications, forming a precise technical mapping. The insulation resistance requirement of ≥1000MΩ stems from safety redundancy requirements at different voltage levels. In portable energy storage power supplies (under 36V), an insulation resistance of 1000MΩ keeps leakage current below 0.036μA. In the high-voltage circuits of electric vehicles (800V), an insulation resistance of 1500MΩ or higher is required to maintain leakage current ≤0.5μA to avoid the risk of electric shock.

 

The tiered design of voltage withstand capability (ranging from a few hundred volts to several thousand volts) reflects scenario-based thinking. Home solar controllers use 500V withstand voltage ceramics, which pass a 1-minute power frequency withstand voltage test without breakdown. The main battery circuit of an electric vehicle requires a 3000V withstand voltage rating to maintain insulation integrity under a 10kV surge voltage. The temperature resistance range (-50°C to 500°C) also addresses extreme environments: Outdoor photovoltaic equipment in Northeast China must withstand temperatures as low as -40°C to prevent brittle ceramic components; fuse Ceramic Body for Electric Vehicle Auxiliary Fuses near the engine compartment must maintain dimensional stability (thermal expansion coefficient ≤ 6×10⁻⁶/K) under long-term operation at 150°C.

 

The mechanical strength design balances weight and protection: Small Ceramic for DC Automotive Fuses (5mm diameter) feature a 1mm wall thickness and a flexural strength of ≥200MPa, meeting the lightweight requirements of portable devices. Large industrial ceramic components (20mm diameter) feature a 3mm wall thickness, achieving a flexural strength exceeding 350MPa and withstanding 500N axial pressure, meeting the vibration resistance requirements of wind turbines (no cracking in a 10-2000Hz sweep frequency test).

 

The performance requirements for Ceramic Casing for Fuse Links in different new energy scenarios differ significantly, driving the refined iteration of product technology. In the electric vehicle sector, the core requirements are "high-voltage insulation + vibration resistance": The ceramic body in the high-voltage power distribution unit (PDU) must pass a 3000V withstand voltage test and maintain structural integrity during a 10g vibration test. Using alumina ceramic with a metal end cap welding process (welding strength ≥ 100N) can reduce the failure rate to 0.01% per year.

PV energy storage systems prioritize "weather resistance + thermal stability": The Ceramic for Electric and Hybrid Vehicle Fuses of the DC-side fuse in centralized inverters must maintain an insulation resistance fluctuation of ≤10% during temperature cycles from -30°C to 85°C. The high thermal conductivity of beryllium oxide ceramic shortens the cooling time after melting to less than 1 second, preventing arc reignition. Distributed energy storage equipment uses alumina ceramic with a nano-coating, which increases salt spray resistance to 1000 hours, making it suitable for humid coastal environments. The core requirements for portable new energy devices (such as outdoor power supplies) are "miniaturization + low cost." Using 90% alumina ceramic (15% lower cost than 95% models), this product achieves a tiny 5mm x 3mm footprint through precision injection molding. It also maintains an insulation resistance of ≥1000MΩ, meeting the protection requirements for circuits below 100V.