What the 30 A rating means for the circuit
The 600 V rating alongside it means the creepage distance across the 7.50 mm pitch is sufficient for that voltage in a pollution degree 2 environment. The silver contact finish is the enabler: silver has lower bulk resistivity than tin, so the contact interface runs cooler at 30 A than a tin-plated contact of the same cross-section would. If the BOM line calls for 30 A per position, this header meets it without needing a dual-row or larger-pitch part.
