A11 Insulators approved for contact lines at 1500 V c.c.

A111 Insulators approved by SNCF – France

A12 Insulators approved for contact lines at 3000 V c.c.

A121 Insulators approved by RFI – Italy
A122 Insulators approved by INFRABEL – Belgium
A123 Insulators approved by RENFE – Spain

A131 Insulators approved by RFI/TAV – Italy
A132 Insulators approved by SNCF – France
A133 Insulators approved by INFRABEL / TUC RAIL – Belgium
A134 Insulators approved by NS – The Netherlands
A135 Insulators approved by NR – Great Britain

A14 Other Insulators for contact lines

A141 Anchoring Insulators
A142 Strut insulators
A143 Top tie Insulators
A144 Feeder Insulators
A145 Other Insulators

A15 Section Insulators