The 1-1376383-2: Three positions in a single row keep the board footprint narrow, which matters when you are squeezing a power tap into a tight corner of the PCB near the edge connector.
Current Rating Depends on Your Wire
Match the terminal to the load current and the wire gauge to the terminal's crimp range. For frequent reconnection, consider a gold-plated variant in the Power Key series.
Temperature Range and Voltage Ceiling
Voltage rating is 300 VAC, which covers most industrial control circuits, lighting ballasts, and power distribution inside a panel — but check the creepage distance on your board if you run near the ceiling in a high-humidity environment.