Ceramic fuses (fusible inserts) "Radiodetal" for equipment protection
Protection of electrical and electronic equipment is necessary not only to prevent the failure of typically expensive devices, but also to prevent fire and/or electric shock to the user. Such protection can be implemented both by external protection devices in the power supply network, for example, automatic switches, and by elements built into the end device. One such built-in protection is a fuse or a fusible link.
The fuse includes an element - a conductor with a given cross section, which, when a current flows through it above the permissible value, burns out due to heating to a high temperature, or in other words, “melts”, that is, the principle of operation of the fuse lies in its very name. The fuse is the weakest section of the protected electrical circuit - usually the input, as it allows you to protect the entire device from failure, in this case, if the conductor in the fuse burns out, the entire device is completely de-energized.
For fuse cases (inserts) with low rated currents, special glasses are used. For higher current ratings, housings are usually made of high-strength grades of special ceramics (porcelain, steatite or corundum-mullite). The body also functions as an arc extinguishing chamber.
Appearance of ceramic fuses "Radiodetal"One of the most popular manufacturers of fuses is the domestic Radiodetal plant, which produces a wide range of fuses, their holders and other electrical equipment. Among the fusible ceramic fuses from the Radiodetal plant, the following types can be distinguished:
| Type | Operating current, A | Operating temperature range,°C | Dimensions, mm | Figure number | ||
|---|---|---|---|---|---|---|
| D | L | L1 | ||||
| VP1-1 | 0.25, 0.5, 1, 2, 3.15, 4, 5 | -60…+100 | 4.0 | 15.0 | - | 1 |
| VP1-2 | 0.25, 0.5, 1, 2, 3.15, 4, 5 | -60…+100 | 4.0 | 15.0 | 8.3 | 2 |
| VP2T-1Sh | 0.16, 0.2, 0.25, 0.315, 0.4, 0.5, 0.63, 0.8, 1.25, 1.6 | -60…+85 | 5.2 | 20.0 | 10.0 | 1 |
| VP3T-2Sh | 3.15, 4, 5, 6.3, 8, 10 | -60…+85 | 7.2 | 30.0 | 18.0 | 1 |
| VP2B-1V | 0.25, 0.5, 0.8, 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10 250 | -60…+100 | 5.2 | 20.0 | 10.0 | 1 |
| VP3B-1V | 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10 | -60…+100 | 7.2 | 30.0 | 18.0 | 1 |
| VP4 | 0.1, 0.16, 0.2, 0.25, 0.315, 0.4, 0.5, 0.63, 0.75, 1, 1.25, 1.6, 2, 3.15, 3.5, 4, 5 | -60…+70 | 3.0 | 7.0 | 5.0 | 3 |
Overall dimensions of ceramic fuses "Radiodetal"The operating voltage of all the types of fuses presented is 250V, that is, their main purpose is to protect electrical devices in a single-phase AC network. For fuses intended for use in AC circuits, the technical specifications indicate the effective values of currents and voltages.
More detailed technical characteristics of fuses can be found in the Specifications on the product page.