Glass fuses

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Glass fuses - miniature protections

Glass fuses are an inherent element that protects electronic equipment . Their task is to stop the current flow in the event of exceeding the nominal value of the device operating voltage. The fuses operate on the basis of a fuse located inside the glass tube. When the current limit value of a given device is exceeded, an ignition of the electric arc takes place and, consequently, the fuse burns, which causes a simultaneous break of the electric circuit . The parameters of glass fuses are selected individually depending on the requirements of the specific equipment and the resistance of the electronic system. The device is able to work again when the fuse is replaced. In colloquial terms, it is often referred to as Eska.

Fusible protection fuses

Tubular glass fuses are used to protect electronic devices and circuits. The inverse time-current characteristic allows for a quick reaction of the fuse in the event of an excessive voltage increase or a short circuit. The greater the increase in current, the faster the wire inside the casing is burnt and the voltage disconnected . The Polish nomenclature uses the designation of fuses as WTA - Apparatus Fuse.

The fuses are used as disposable safety element . After their operation, the fuse is replaced with a new one. Due to its properties (response times) and application, they are divided into:

  1. Time-delay fuses (slow, WTA-T) - are most often used as protection of RTV equipment and electronic devices exposed to temporary overloads and short voltage pulses. The parameters of these fuses allow for delayed, according to the specification, actuation of the device protecting the device. They effectively protect various types of fans, electric motors and transformers.
  2. Fast fuses - are used to protect power supply systems of home appliances. They are known as WTA - F. They are used, inter alia, as protection of household appliances . Their current characteristics allow for an effective and quick reaction. When a momentary voltage increase occurs, the current flowing to the receiver is disconnected. This prevents further damage to the devices and protects the working components.

Glass fuses - construction and parameters

The direct working element and the main part of the apparatus fuse is the fuse. It is usually a copper wire or tape. In some types of fuses the copper is covered with silver or it is made of only silver. The fuse in the slow-blow fuses may have a loop in the middle part. It causes a delay in the burnout of the wire. Due to the time-current characteristics of larger fuses, these tapes may have appropriately selected notches or fuse narrowing responsible for short-circuit protection . The fuse is made of a glass tube with metal contacts. These are nickel-plated brass plugs that allow the protection to be inserted into the socket. For automation applications, glass fuses with whiskers at the ends are also used. They are designed to be soldered into a PCB.

The most common sizes used to protect electronic equipment are tubular fuses with a body of 5 x 20 mm and 5 x 25 mm. The voltage parameters of these short-circuit protection devices range from 32mA to 25A rated currents. In the protection of electronic devices, there are also the less frequently used sizes 5 x 15 mm and 6.3 x 32 mm. The maximum value of the rated AC voltage for glass fuses used in industrial automation is 250 V.