RST 2.5-BULK-SHORT application field and working principle

RST 2.5-BULK-SHORT is a class of fuses used for protection of electric systems and selectively protecting enclosed equipment. The fuse is designed in a structure that links the protection terminal parts of the equipment with the fuse link. Its operating principle lies in the fact that when a fault current occurs, the fuse link melts, thus breaking the fault circuit to safeguard the protected equipment.

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• Application Field of RST 2.5-BULK-SHORT
• Working Principle of RST 2.5-BULK-SHORT

Application Field of RST 2.5-BULK-SHORT:

RST 2.5-BULK-SHORT fuse is suitable for use in typical low voltage power distribution systems and especially for installations with short lengths of cable between the fuse and the load to be protected. It is available in a range of sizes suitable for a variety of applications and its wide current range makes it ideal for protecting motors, transformers, generators and other equipment, as well as the whole installation. It can also be used for circuits with more than one load, because it opens the circuit within seconds. This prevents dangerous thermal contact during short circuit events.

Typically, RST 2.5-BULK-SHORT is applied on DC circuits, AC circuits, single pole switching, neutral switching, circuit looping, and circuit grounding. It is widely used in the industrial field, such as factories, industrial plants, residential premises, public buildings, electricity supply plants, railway transport, electronics, LED lighting, etc.

Working Principle of RST 2.5-BULK-SHORT:

RST 2.5-BULK-SHORT works based on its overheating characteristics. It is composed of a metal element that is subjected to an electric current. The greater the current, the more heat is produced in the element and its temperature rises. If this temperature reaches the required limit, the fuse link melts, abandoning the circuit and breaking it to protect the protected equipment.

The fuse link is embedded into a cylindrical housing made from an insulation material, such as porcelain, plastic or ceramic. This housing offers additional protection against accidental contact with the current carrying parts, which makes the circuit safe to the operators. Additionally, this housing increases the effect of the fuse link to reduce the overcurrent.

The fuse link of RST 2.5-BULK-SHORT absorbs a small amount of energy from the fault current. Once heated up, it melts at the specified temperature, isolating the fault current from the protected equipment in milliseconds. The melting time of the fuse link can be adjusted and is determined by the fuse size. The design of this fuse features a high degree of standardization and ensures complete safety of the load.