The 3VA9987-0KP80: The 10 A thermal current (Ith) is the continuous current-carrying capacity of the connector under normal conditions — it governs the maximum load on the auxiliary circuit, not the main power path. The 250 VDC minimum operating voltage means the connector is rated for DC control circuits down to that level; it will handle lower voltages within its design range but the 250 V figure is the minimum guaranteed for the rated surge and pollution performance.
The connector measures 15 mm wide, 55 mm deep, and 68 mm high. The stripped length is specified at 15 mm (0.6 in) — use that as the strip gauge for the wire termination to ensure full contact in the cage clamp. These dimensions match the accessory slot on the 3VA plug-in unit family; no panel rework is needed if the existing panel was laid out for a 3VA breaker.