Fuse Casings Ceramic: Ensuring 1500A Break Capacity

According to the China Association of Automobile Manufacturers (CAAM), the penetration rate of 800V+ high-voltage EV platforms in China exceeded 40% in H1 2025. High-voltage systems require fuses with 1500A break capacity, and fuse casings ceramic play a key role in ensuring this performance. This article explores factors affecting break capacity, material requirements, structural design, application scenarios, and Xiamen APOLLO's solutions.

 

 

1. High-Temperature Stability of Materials​

An electrical steatite ceramic fuse body can withstand 1200℃, which is essential for quenching arcs during 1500A current breaking. Low-temperature materials melt easily, causing arc leakage and failure.​

 

2. Insulation Strength​

Electrotechnical ceramics have a dielectric strength of over 20kV/mm. This prevents insulation breakdown under 1500A high current, avoiding short circuits after breaking.​

 

3. Heat Conduction Efficiency​

Ceramic casings need a thermal conductivity of 1.5-2.0 W/(m·K). Efficient heat conduction dissipates arc heat quickly, preventing casing cracking from thermal shock during 1500A breaking.

 

 

1. High arc resistance: Fuse ceramic tubes resist arc erosion. During 1500A breaking, arcs won't damage the casing inner wall, ensuring repeated use safety.​

 

2. Low thermal expansion: Steatite ceramic for EV fuse has a thermal expansion coefficient of ≤5×10⁻⁶/℃. This avoids casing deformation when arc heat rises sharply.​

 

3. Mechanical impact resistance: The casing's compressive strength must exceed 250MPa. It can withstand mechanical shock from arc explosion during 1500A breaking.

 

 

1.  Cavity Volume Calculation​

The casing inner cavity volume should be ≥15cm³ for 1500A fuses. Sufficient space allows arcs to expand and cool, avoiding arc reignition.​

​2.  Heat Dissipation Channel Layout​

Add 3-4 axial heat dissipation grooves on the casing outer wall. Grooves increase heat dissipation area by 30%, accelerating arc heat release during 1500A breaking.​

 

3.  Sealing Performance Enhancement​

Use IP65-grade silicone gaskets at the casing ports. They prevent external dust and moisture from entering, ensuring stable 1500A break capacity in harsh environments.

 

 

Ceramic fuse casings with 1500A break capacity are widely used in high-voltage electrical systems. In 800V EV battery packs, electrotechnical ceramics ensure safe breaking during short circuits. In energy storage converters (500kW+), fuse casings ceramic handle 1500A surge currents. In high-power charging piles (480kW), electrical steatite ceramic fuse body maintain stable performance under long-term high loads. These scenarios rely on the casing's break capacity to protect system safety.

 

 

Xiamen APOLLO's fuse casings ceramic use high-purity steatite ceramic (purity ≥95%), which has better high-temperature stability than the 90% purity material used by most peers. This ensures reliable 1500A break capacity without casing damage. Our electrical steatite ceramic fuse body undergoes three quality checks (density, insulation, thermal conductivity)-stricter than peers' two-step checks-and meets IATF 16949 and UL standards.​

 

We offer flexible custom services, adjusting the length and inner cavity size of fuse ceramic tubes according to customers' 1500A fuse specifications-more adaptable than peers with fixed sizes. Our global sea-land-air logistics delivers to North American/European ports in 15-25 days (3-5 days faster than industry average). Our after-sales team provides 24-hour response support to solve installation issues.