General
Degree of protection	flink
Nominal current	3,15 A
Nominal voltage	250 V

The 520.622 fuse from Eska is an electrical protection component for use in low-voltage installations. It complies with standards DIN 41661 and EN 60127-2-2 and is designed as a fast-acting fuse, meaning it does not trip during short-term, overload-related current surges, but only during sustained overloads or short circuits. The fuse has dimensions of 5x20 mm and is rated for a nominal current of 3.15 A and a nominal voltage of 250 V. It is used in switchgear, devices, and installations where precise and reliable current limitation is required to protect electrical components from damage.

Fuse is a term for small, cylindrical fuses with a defined nominal current, used in electrical circuits to protect against overload and short circuit. The term fast-acting describes the time-current characteristic: the fuse does not react immediately to brief current surges, but only to sustained overloads, making it particularly suitable for applications with transient loads. The dimensions 5x20 mm are a standard size for fuses, used in many fuse holders and switching devices.

Compliance with standards is a central aspect of this fuse. Adherence to DIN 41661 and EN 60127-2-2 ensures that the product meets European and German requirements for safety and reliability of electrical fuses. These standards regulate, among other things, mechanical, electrical, and thermal properties as well as testing procedures. The nominal voltage of 250 V makes the fuse suitable for applications in alternating current installations up to 250 volts, for example in household or small installations. The nominal current of 3.15 A is the maximum current the fuse can carry continuously without tripping.

The fuse is designed for use in electrical switchgear and devices where precise current limitation is required. Typical applications include protection circuits for consumers such as motors, heating appliances, or electronic modules that are sensitive to current surges. The fast-acting characteristic prevents unnecessary tripping during short-term load surges, such as when motors start up or during transients in the power supply.

Technology explained simply: The fuse consists of a glass or ceramic body with a metallic fuse element inside. When the current exceeds the nominal value of 3.15 A and persists, the element melts and interrupts the circuit. The fast-acting characteristic means the fuse does not trip during short-term, high current surges (e.g., during motor start-up), but only during sustained overloads. This protects sensitive devices from unnecessary shutdowns while ensuring protection against thermal damage.

Compatibility and accessories: The fuse is designed for holders and fuse holders that support the 5x20 mm dimension. It is compatible with standard fuse holders designed for this size. The fuse can be used in switchgear, devices, and electrical installations where a 3.15 A protection function is required.

Installation and mounting: The fuse is inserted into a suitable fuse holder mounted in the switchgear or device. Installation is done by simply inserting it into the holder, ensuring correct alignment and a secure connection. The fuse is not intended for direct use in open circuits without a holder. Mounting is carried out in electrically protected environments, observing the regulations of the respective installation standards.

Operational advantages: The fast-acting characteristic enables reliable protection without unnecessary tripping during transient loads. Compliance with DIN 41661 and EN 60127-2-2 standards ensures high safety and reliability. The standard size of 5x20 mm ensures universal compatibility with common fuse holders. The fuse is designed for use in low-voltage installations up to 250 V, providing precise protection for sensitive electrical components.