This part of IEC 61881 applies to d.c. electric double-layer capacitors (cell@ module and bank) for power electronics intended to be used on rolling stock. This standard specifies quality requirements and tests@ safety requirements@ and describes installation and operation information. NOTE Example of the application for capacitors specified in this Standard; d.c. energy storage@ etc. Capacitors not covered by this Standard: - IEC 61881-1: Paper/plastic film capacitors; - IEC 61881-2: Aluminium electrolytic capacitors with non-solid electrolyte. Guidance for installation and operation is given in Clause 9.