The 387600105: The 15A per-circuit rating at 300V is the continuous working limit — the limiting factor is the temperature rise in the UL94 V-0 thermoplastic housing, not the steel screw hardware. Wire range 14-22 AWG covers most control and power wiring in industrial panels; the screws with Zinc Clear Chromate finish resist corrosion in cabinet environments. The closed bottom termination means there are no exposed solder tails on the back side — the block is fully enclosed, which simplifies mounting against a metal panel without needing additional insulation.
Position count vs sibling blocks
The 387600105 carries 5 circuits — the same 0.375" pitch, 15A rating, and flange chassis-mount footprint as the 8-circuit 387600108 and the 2-circuit 387600102. The only difference is the number of wire entries: 10 on this 5-circuit block (2 rows per circuit), 16 on the 8-circuit, and 4 on the 2-circuit. If the BOM calls for 5 positions, this is the direct match; the 8-circuit block is the drop-in for a higher density requirement on the same panel layout.