ESKA - our favourite fuses

For more than 70 years, ESKA Erich Schweizer GmbH has been developing and manufacturing fuses at its headquarters in Kassel under the “Made in Germany” quality label. ESKA offers fuses manufactured following international standards IEC / EN 60127, UL 248-14 and DIN as well as non-standard fuses. We’ve chosen the most popular series of 5x20mm cartridge fuses for our warehouse:

● 520.600: EN 60127-2-2, type F (quick-acting), low breaking capacity (35A)
● 522.500: EN 60127-2-3, type T (time lag) low breaking capacity (35A)

It is not possible to recommend correct fuse without detailed information about your application, but ESKA provides at least general guidelines for selecting the right fuse:

● FF – Very fast-acting fuses are intended as short-circuit protection for semiconductors (diodes, thyristors, triacs, etc.) and for devices for which fast-acting fuses are still too slow. 

● F – Quick-acting fuses are used for protection of a device without inrush current during switching on and also for the devices where high overcurrent or high short-circuit current must be interrupted quickly.
● M – Medium time-lag fuses are used mainly when only small inrush currents have to be taken into consideration.
● T – Time-delayed fuses are used for devices with high inrush current during switching on and slowly dropping to a steady value, for example when starting engines.
● TT – Super time-lag fuses are used when the expected current surges will be greater than those which current surge resisting fuses can withstand.

FF, M and TT types are not standardized; ESKA manufactures them according to their company standards.

Recommended series of fuses for specific applications:

● For high pulse resistance at a rated voltage of 250 V (protection of switching power supplies with parallel MOV at the input, test with 8/20 µs wave at ≥ 2 kV with 2 Ω): Series 521.5XX ≥2.5 A, UL522.2XX ≥1,25 A, 522.4XX ≥1 A
● For high efficient circuits with transducers working in the kHz range: Series 522.7XX, 522.3XX, 522.0XX
● For applications with increased continuous operating current (cooling and heating systems, fans): Series 521.0XX, 632.1XX, 632.5XX, 632.0XX, 632.2XX, 1038.6XX, 1038.3XX
● For circuits with low internal resistance (high short-circuit current): Series 521.0XX ≥1.6 A, 522.7XX
● For applications with high assembly density at moderate short-circuit currents (consumer electronics): Series 885.0XX, 887.0XX, 883.0XX
● For low signal distortion in data transmission etc.: SMD Chip
● For semiconductor protection (diodes, thyristors, etc.): Series 520.1XX, 520.5XX, 520.0XX, 1038.1XX
● For industrial control systems: Series ES-MSXX, 888.4XX, 220.0XX, 222.0XX
● Short-circuit protection for batteries: 823.6XX, 888.3XX, 888.2XX
● For telecommunication applications according to ITU-K20/21, Telcordia, UL 1950: Series 522.5XX ≥1.25 A, 530.6XX, ES-SMP ≥1,25 A
● Fuses for lamp ballasts: Series 515.3XX ≥1.25 A
● Fuses following IEC 60127-4 (UMF, Universal Modular Fuses): Series 900.0XX, 910.0XX

Selected ESKA fuses can be found in our stock assortment, the other series can be ordered upon request.

If you are interested in other ESKA products or you need more details, we are ready to help you at sales@soselectronic.com