Zener diode - Zener voltage vs reverse voltage specification
First off: TVS diodes are Zener diodes.

You should pick Vz = 24 V
Pick part number: 3SMAJ5934B

Vr is the latest voltage at which the diode is not yet entered the Zener region and draws a small current called &quot;maximum reverse current&quot;.
3SMAJ5934B maximum reverse current is 1 μA
Once entered the Zener region the diode will draw much more current than 1 μA. See the test data in the following table.