This item is now obsolete , If you are using the Dali dim feature below is a viable alternative  

Alternative 

The Tridonic PCA 1x26-57 TC ECO xitec II is a high frequency dimmable ballast for use with DALI/DSI/switchDIM interfaces.
Compatible with the following lamps:
1 x 40w T5 Circular Lamp
1 x 26w Double Turn Compact Fluorescent Lamp
1  x 26w Triple Turn Compact Fluorescent Lamp
1 x 40w Long Single Turn Compact Fluorescent Lamp
1 x 40w T5 Circular Fluorescent Lamp
1 x 32w Triple Compact Fluorescent Lamp
1 x 42w Triple Turn Compact Fluorescent Lamp
1 x 57w Triple Turn Compact Fluorescent Lamp

Tridonic part number: 22185120