Ceramic tube fuses are usually classified as high breaking capacity fuses, and one of their design goals is to safely cut off high current faults. The following is a specific analysis:
1. Definition of high scoring ability
High breaking capacity refers to the ability of a fuse to safely cut off extremely high fault currents (usually up to thousands of amperes) in the event of a short circuit or overload without causing explosion, combustion, or arc residue. These types of fuses require strict certification (such as UL, IEC standards) to ensure reliable operation under extreme conditions.
2. High breaking characteristics of ceramic tube fuses
From the search results, the breaking ability of typical ceramic tube fuses is significantly higher than that of ordinary glass tube fuses:
Littelfuse 514 series: With a breaking capacity of up to 5000A at 500V AC voltage, it is suitable for industrial high-voltage scenarios such as three-phase power supplies and UPS.
Eaton AHCx series: also supports 500VAC/VDC voltage, with a breaking capacity of thousands of amperes, designed specifically for high fault current environments such as variable frequency drives and energy storage systems.
3. Structural design and implementation of high separation
Ceramic tube body: Compared to glass tubes, ceramic materials have high temperature resistance and strong impact resistance, and can withstand the high temperature and pressure of internal arcs during short circuits, avoiding tube explosion.
Filling material: Fill the tube with arc extinguishing materials such as quartz sand to quickly absorb arc energy and accelerate current cutting.
Compact packaging: For example, the 514 series has a size of only 6.3mm × 32mm, achieving high breaking capacity in a small volume, suitable for compact power supply designs with limited space.
4. Other characteristics that support high performance
Wide temperature adaptability: The working temperature range reaches 55 ° C to 125 ° C, ensuring reliability in extreme environments such as industrial equipment and outdoor meters.
Anti vibration design: By optimizing the structure, the impact of mechanical stress is reduced and the lifespan is improved.
5. Typical application scenarios
High breaking ceramic tube fuses are mainly used in high fault current risk scenarios:
Industrial field: UPS power supply, three-phase AC motor, variable frequency drive, photovoltaic inverter.
Civilian field: smart meters, HVAC systems, building automation power protection.
Conclusion
Ceramic tube fuse is a typical high breaking fuse. The combination of ceramic tube body and arc extinguishing filling material enables it to safely cut off thousands of amperes of fault current, especially suitable for AC/DC circuit protection with high voltage and high reliability requirements. When selecting, attention should be paid to the specific model's breaking capacity (such as 5kA), voltage/current rating, and operating temperature range to match the requirements of the application scenario.