DIN EN 60549:2014-02

This standard applies to "external" fuses used with high-voltage capacitors according to IEC 60871-1, "Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V - Part 1: General". IEC 60871-1 is applicable to both capacitor units and capacitor banks intended to be used, particularly, for power-factor correction of a.c. power systems, and also to capacitors intended for use in power filter circuits. Fuses according to this standard are intended to clear either faults inside a capacitor unit to permit continued operation of the remaining parts of the bank in which the unit is connected (unit fuses) or faults on the whole capacitor bank to isolate the bank from the system (line fuses). In some cases, fuses tested only to IEC 60282-1 or IEC 60282-2 can be suitable for use with capacitors if they are not required to interrupt capacitive currents (for example if capacitive currents cannot flow, or if they are acting as a "back-up", to provide high inductive current breaking, to other devices that will clear capacitive currents). The responsible committee is DKE/UK 432.4 "Hochspannungs-Sicherungen" ("High-voltage fuses") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.