How to find maximum DC voltage allowable on a Schneider ic60n circuit braker

[drakejest]

Looking for a DC disconnect switch for a solar array, Typically what is done in my area is they use a DC rated circuit breaker instead of using a solar disconnect switch (caused a few fires because of these failing) my problem is these DC "solar" breakers are usually chinese brands and none from a reputable brands (that i can get a hold of) so im a bit skeptical on those, im probably sure there are good chinese brands out there but finding which one is the problem.

Anyway my hope right now is this breaker from schneider: ic60n series and the datasheet says its okay to use in a DC network, but my only problem is i do not see a maximum voltage rating especially for DC.

There is though breaking capacity, although breaking capacity is important, i dont really mind having very low breaking capacity as the DC lines are fused, what i really care about is it able to handle 350V DC (my short circuit voltage).

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The breaking capacities seems to indicate a maximum 125V-DC and  450V-AC. If it can handle 450V-AC wont that imply that its internals are able to handle withstand 450V AC and DC? If current is the problem i can always get a higher Amp rated version as i dont plan on using it as a breaker but rather a disconnect, and the line is fused to a lower rating than the breaker so there is no problem of an overcurrent.

[TimFox]

The datasheet  file:///C:/Users/fox50/Downloads/Schneider%20Electric_Acti9-iC60_A9F74220.pdf  is explicit on its breaking capabilities on AC and DC (separate lines).
All DC breaking values are at 125 V DC.  AC breaking voltages are higher, since the voltage goes periodically to zero and it's harder to make a contact-damaging arc across the opening switch.