What Does AC-23 Mean?

AC1 AC2 and AC3 are duty markings.

Category IEC Category Description
AC1 Non-inductive or slightly inductive rows

AC2 Starting of slip-ring motors

AC3 Starting of squirrel-cage motors and switching off only
after the motor is up to speed. (Make LRA, Break FLA)

AC4 Starting of squirrel-cage motors with inching and
plugging duty. Rapid Start/Stop. (Make and Break LRA)

AC11 Auxiliary (control) circuits

Hope that helps in answering your query.

Cheers.