I don't understand the voltage ratings given. On the far left, it looks like four different voltage ratings. Is there some way to tell which ones are applicable under what circumstances?
What you have there is a bad form of technical documentation - too terse to be easily comprehensible. So what I did was to go to the manufacturer's site (Wago) and looked at the tabular form of specifications in their catalog (search for 236-102). Another helpful clue is the vertical line separating two voltage ratings which matches the split between metric and AWG. It turned out the split is also for two separate ratings depending on the certifying authority. So here's what those numbers would mean:
On left side: [Rated Voltage]/[Rated Surge Voltage]/[Applicable Environment/Pollution Category], [Nominal Current]
On right side: [Rated Voltage], [Nominal Current] [Certification]
Thus for CSA, the certified ratings are 300V and 15A.