The 24kV porcelain cut-out fuse (with interrupter) is specially designed for short-circuit protection in medium-voltage distribution systems, integrating ceramic insulator and high-efficiency interrupter to achieve fast breaking (≤10ms) and visible breakpoint isolation. Suitable for:
Harsh Environment: High Pollution (Class IV), Coastal Salt Spray, Industrial Pollution Areas
High short-circuit current scenario: transformer secondary side protection, cable branch box inlet protection
Frequent operation requirements: photovoltaic/wind power collector lines, industrial park ring network system
According to IEC 60282-1, GB/T 15166.2)
| Parameters | Technical indicators |
| Rated voltage: | 24kV (up to 27.6kV) |
| Rated current | 100A (continuous current-carrying, temperature rise≤65K) |
| Breaking capacity 12.5kA (symmetrical RMS) | 16kA (symmetrical RMS with interrupter design) |
| Arc extinguishing performance | Arc extinguishing time≤ 15ms (at 12kA fault current) |
| Creepage distance: | ≥750mm (ceramic umbrella skirt anti-fouling flash design) |
| Power Frequency Withstand Voltage | 65kV/1min (dry), 50kV/1min (wet) |
| Lightning impulse withstand voltage | 150kV (peak, 10 times each of positive and negative polarity) |
| Mechanical Strength | The flexural strength of the porcelain body ≥ 12kN, and the contact pressure ≥ 300N |
| Application scenarios New energy stations: photovoltaic inverters, box transformers high-voltage side protection Industrial power distribution: electric arc furnace transformer inlet protection in steel plants Urban power grid: overcurrent protection of underground cable ring main unit Mine power supply: mobile substation protection in high-vibration environmentsInterrupter material |
High temperature resistant ceramic + metal arc extinguishing grid (arc ablation resistant) |
| Operating life | 2000 times of mechanical ≥ and 50 times of electrical ≥ |
| Degree of protection | IP66 (dust and water resistant) |
Key technology of arc extinguisher
Arc extinguishing grid design:
Multi-layer V-shaped metal grids (copper-tungsten alloy) split the arc and force cooling to reduce the free gas pressure.
The grid spacing is ≤ 2mm, and the arc voltage gradient ≥ 200V/mm.
Air blowing arc extinguishing:
Arc energy is used to decompose gas-producing materials (e.g., polyamide) to produce longitudinal arc blowing of high-pressure gases.
Gas production ≥ 50 L/kA (when 12 kA is broken).
Sealing structure:
Silicone rubber sealing ring is used between the interrupter and the porcelain body, which can withstand high arc temperature (instantaneous ≥3000°C)
Precautions
⚠️ Safety Warning:
Insulated operating rods (length ≥ 2m) and full protective equipment must be worn for live operation;
After the breaking operation, it is necessary to wait for more than 5 minutes, and then reset after the arc extinguishing chamber is cooled;
The use of hyperparameters (e.g., replacing a 36kV system with a 24kV fuse) is prohibited.
If you need specific model parameters or customized solutions from suppliers, please provide:
System short-circuit current level (12kA/16kA/20kA)
Pollution Rating (Class III./Class IV)
Remote condition monitoring is required (integrated sensor optional)
