IEC 61921 Revised
IEC 61921:2003
Power capacitors - Low-voltage power factor correction banks
Applicable to low-voltage a.c. capacitor banks intended to be used for power factor correction purposes, equipped with a built-in switchgear and controlgear apparatus capable of connecting to or disconnecting from the mains part(s) of the bank with the aim to correct its power factor.
CHFÂ 155.-
A more recent version of this publication exists:
IEC 61921:2017 RLV