CUA31

if any equipment is assigned such label like "sells as a spare part" this means that this equipment very close to its discontinuation.

Whether there is any successor instead, that's a different matter.

From October 1, 2017, the SINAMICS S120 Power Module PM340 blocksize will be redrawn from the active marketing phase, and administered as product to be phased out.

The already successfully introduced SINAMICS G120 Power Modules PM240-2 will be the successor product for the SINAMICS S120 Power Module PM340.

 The CUA31 sells as a spare part due to PM340 is going to be phased out. It's clear.

Also you can try CU310 for PM340.

Cheers