scope:

This standard applies to external fuses used with high-voltage power capacitors according to IEC Publication 70, Power Capacitors, for use on alternating current systems of 50 Hz and 60 Hz.

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).

These fuses are not a substitute for a mechanical switching device, but when forming a part of a mechanical switching device such as a fuse-switch or a fuse disconnector, they shall comply with this standard..

When fuses are used for the external protection of a capacitor unit or a capacitor bank (line fuses), their voltages and breaking ratings shall be adequate for the system.

Fuses according to this standard shall comply with the requirements of IEC Publication 282-1, High-voltage Fuses, Part 1: Current-limiting Fuses, or IEC Publication 282-2, Part 2: Expulsion and Similar Fuses, except those which are specifically excluded in this standard.

Object

The object of this standard is to formulate uniform requirements and test procedures regarding performance and testing of fuses intended to be used for capacitor protection.