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Frequently Asked Questions About Medium and High Voltage Fuses
1. What is the fuse?
Fuse is the protective device that by the melting of one of its components (fuse-link) opens the circuit by breaking the current when this exceeds a given value for a sufficient time.
Wenzhou Shuguang Fuse Co.,Ltd（SR Fuse) as a factory with more than 30 years of experience in fuse production, we mainly produce LV Fuse, MV Fuse and HV Fuse.
2. What is fuse application?
Fuses are commonly used protective devices against overload conditions. They can be used as sole component or in combination with other switching apparatus like switch-disconnector, contactor, breaker.
The following are the specific applications of fuses:
- XRNT series current limiting fuse for transformer protection
- XRNP series current limiting fuse for transformer protection
- XRNM series current limiting fuse for motor protection
3. What is striker pin?
The striker pin is mechanical compound of the fuse-links that is automatically released when fuse operates. It has sufficient energy required to cause operation of combined apparatus or to provide interlocking. It has indication function as well when no other switching apparatus is combined with the fuses.
4. What BS stands for?
The IEC fuse-links have two types of connections – the DIN with round terminals connectable by fuse clips and with flat connectors that are commonly known as BS tags. The BS tags are fixed to the base by the screws and exists in four different dimensional standards (A, B, C, D).
5. What is difference between current-limiting and expulsion fuses?
The current-limiting fuse, during and by its operation in a specified current range, limits the current to a substantially lower value than the peak value of the prospective current, whereas expulsion fuses allow prospective current to achieve its peak value. Therefore current-limiting fuses offer significantly higher protection level, benefiting in extension of protected circuit life time.
6. What DIN size means?
DIN size, describes the external dimensions of fuses, DIN fuses have a contact diameter of 45mm, and the series of lengths are 192mm, 292mm, 442mm, 537mm depends on voltage. The current fuse standard IEC 60282-1 has taken over the requirements in this respect from the previous DIN 43625 standard.
7. What does HRC fuse-link means?
HRC stands for high rupturing capacity fuses. The term used for fuses, of a closed housing with high breaking capacity and with melting performance according to characteristic. In the face of the emergence of numerous designs and principles of operation, it became too general and not included in HV fuse standards nomenclature. For high-voltage fuses in the technical nomenclature, the appropriate and currently used terms more precisely define the fuse's operating principle, e.g. current-limiting back-up fuses.
What Does a Surge Arrester Do? Understanding Its Function in Power Safety
Surge Arrester (SPD or TVSS) is a device that protects other electrical equipment by "suppressing" or releasing surge currents caused by external forces (such as lightning) or internal forces (switching events).