High-Voltage Current-Limiting Fuses: Applications, Features, and Specifications

Key Features

1. High Breaking Capacity: The rated breaking current of the product ranges from 40KA to 50KA.
2. Low Power Loss: Ensures low temperature rise of the product, which is particularly advantageous when the fuse is used in fully enclosed insulation devices.
3. Low Arc Voltage: During the breaking process, the arc voltage is relatively low. When used in systems below the rated voltage, the arc voltage is further reduced—allowing 12KV fuses to be used in 12KV or 7.2KV systems without the risk of damaging system insulation.
4. Small Error of Time-Current Characteristic Curve: The error of the time-current characteristic curve is less than ±10%, ensuring product reliability.
5. Standardized Specifications: The rated parameters of the product comply with IEC (International Electrotechnical Commission) standards R10 and R20 series.
6. Two Wiring Types:(1) Busbar Type: Overall dimensions comply with British (BS) standards; can be directly fastened to the busbar with screws, featuring small installation volume and reliable contact.(2) Plug-in Type: Overall dimensions comply with German (DIN) standards; easy to replace and can be operated with electricity.Both types meet IEC standards.
7. Optional Striker: A tungsten wire connected in parallel with the fuse element melts within a few thousandths of a second at the start of an arc, igniting the powder device. The striker controlled by a small amount of gunpowder acts immediately, delivering sufficient energy to send a signal, trigger other electrical equipment, or provide interlocking. The output energy of the striker complies with:

   • British (BS) standards: (1～3) Joules

   • German (DIN) standards: (2～5) Joules

Key Terminology Explanations

• High-voltage current-limiting fuse: Professional term for "高压限流熔断器", a protective device that limits short-circuit current and breaks the circuit in high-voltage systems.

• Rated breaking current: The maximum short-circuit current that the fuse can safely break under specified conditions.

• Time-current characteristic curve: A curve describing the relationship between the fuse's operating time and the fault current, directly affecting protection accuracy.

• IEC/BS/DIN standards: International and regional authoritative electrical standards, ensuring product interchangeability and compatibility.

• Striker: An auxiliary component in fuses that triggers interlocking or alarm signals after fuse action, enhancing system safety.