Limiting Inrush on AC/DC converter
You can try something like this.  With the supply off, the limiting resistor is in the primary circuit.  When the DC output reaches a level that can energize the relay, the resistor will be shunted.  

As @Autistic mentioned, transformers can create surge currents when power is applied.  Worst case is when the applied AC voltage happens to be at one of its positive or negative peaks.  This can momentarily saturate the core.  An interposing solid state relay that switches at zero crossing would prevent this, but you still have the filter capacitance initial charging current reflected back to the primary.  The series limiting resistor addresses both sources of inrush.

I would choose a resistor power rating of 10 ~ 25 Watts.







simulate this circuit &ndash; Schematic created using CircuitLab