General
Switching characteristic	slow-acting
Rated voltage	250 V AC
Rated current	2 A
Volume	120 St.
Material	glass tube
Standard designation	SIBA 179120

The Eska fuse 522.520 is a glass tube fuse assortment with a slow-acting switching characteristic, specifically designed for use in electrical installations with a rated voltage of 250 V AC. The product is delivered in a pack containing 120 individual pieces and serves a protective function in electrical circuits, particularly in installations where delayed disconnection is required during short-term current surges. The fuses are designed as fine fuses, meaning they are suitable for precise current regulation and protection of sensitive electronic components.

Applications
This fine fuse is intended for use in electrical devices and installations with a rated voltage of 250 V AC. Typical application areas include heating systems, lighting systems, electronic controls, and other devices where high protection accuracy and a slow response to short-term current overloads are required. The slow-acting switching characteristic prevents unnecessary disconnections during transient current surges that are not harmful, while simultaneously ensuring protection against sustained overloads.

Functions and Equipment in Detail
The fuse is designed as a glass tube, providing high transparency and thus enabling visual inspection of its condition. The slow-acting switching characteristic (type T) ensures that the fuse does not immediately trip during short-term current surges, but only trips during sustained overloads. This is particularly important in installations that exhibit higher current levels during startup or sudden load changes. The rated voltage of 250 V AC covers the standard range for many household and industrial applications.

Technology Explained Simply
The term slow-acting refers to the time delay in the fuse's tripping mechanism. In contrast to fast-acting fuses (type F), which react immediately to any overload, a slow-acting fuse remains operational during short-term current surges. This prevents false tripping, for example, when motors or transformer devices are switched on. The glass tube construction provides good heat dissipation and is resistant to external influences such as moisture or mechanical stress. The fuse is designed for a rated current of 2 A, making it suitable for applications with low to medium power.

Compatibility and Accessories
The fuse is designed for standard 5x20 mm fuse holders, which are commonly installed in many electrical switchgear and devices. It is compatible with holders designed for these dimensions and can be used in switchgear systems that support a rated voltage of 250 V AC. The designation SIBA 179120 indicates corresponding standardization that defines the electrical and mechanical properties of the fuse.

Installation and Mounting
Mounting is carried out in standard fuse holders designed for 5x20 mm. The fuse is inserted into the holder, ensuring correct alignment and a secure connection to guarantee reliable electrical contact. Installation takes place in electrical circuits with a rated voltage of 250 V AC. It is essential to ensure that the fuse is not overloaded and that the rated current of 2 A is not exceeded.

Advantages in Operation
The slow-acting switching characteristic provides the advantage that the fuse does not trip during short-term current surges, thereby increasing operational reliability. The glass tube construction allows for easy visual inspection to determine whether the fuse is intact. The pack of 120 pieces offers an economical solution for replacement needs in larger installations or during regular maintenance work. The fuse is designed for use in installations with 250 V AC, enabling broad applicability across various industries.