The 387207510: Top termination uses screws with a captive plate — the plate stays captured in the screw, so there is no loose washer to drop into a live panel. Wire range is 12-22 AWG, which covers most control-circuit and small-power conductors; the steel screw with zinc, clear chromate finish resists corrosion in cabinet air.
The dual-wall barrier design (2 Wall) isolates each circuit from its neighbour — no shared slot, so a stripped wire end cannot short across terminals.
The 10-circuit 387207510 sits between the 6-circuit 387207506 and the 12-circuit 387207512 at the same 0.375" pitch, 25 A rating, and termination style. The 15-circuit 387207515 is also available for higher-density boards.