What the dual breaking capacity means for your panel
The 5SY6316-7: For UL 1077 recognized supplementary protection, the interrupting rating is 5 kA at AC — check that your fault current stays under that limit if the panel is built to North American code.
DC rating and application limits
The DC voltage rating is 60 V per pole (72 V max), with a DC breaking capacity of 15 kA per IEC 60947-2 — this means it can switch and interrupt DC loads in control circuits or battery-backed supplies, but the poles must be series-connected for voltages above 60 V.
IP20 with conductors connected; the sealable cover (yes) lets you lock the handle position to prevent unauthorized switching — useful for lockout/tagout on a machine circuit.