Panel or PCB — a flange-mounted barrier block for 14-22 AWG
The Molex 0387106203 is a 3-circuit barrier terminal block from the Beau 38710 series, built for terminating 14-22 AWG wire to a PC pin or panel connection. It carries a 15A per-circuit current rating at 300V, with the 0.375" (9.53mm) pitch providing enough spacing between terminals for the voltage rating without crowding the wiring. The dual-wall barrier design isolates each terminal position, so a stripped wire end can't short to the adjacent circuit. The flange on each end lets you bolt the block to a chassis or enclosure panel before wiring — useful when the block sits at a cable entry point and needs mechanical support independent of the PCB. The black PBT housing is rated for the -40°C to 100°C operating range, covering most industrial cabinet and control panel environments. Termination is straightforward: strip the wire, insert it under the screw clamp, and tighten. The block accepts one wire per entry, with 3 wire entries matching the 3 circuits.
Mounting and wiring — what the dual-mount spec means on the bench
The through-hole PC pins let you solder the block directly onto a PCB for a permanent board-level connection. The flange adds a separate panel-mount option — screw the block to a chassis or enclosure wall, then run the PC pins to a board or wire them point-to-point. This dual-path mounting is common in power distribution panels where the block serves as a field-wiring interface and the PCB carries the control circuitry. The 0.375" (9.53mm) pitch means the three PC pins are spaced 9.53 mm apart centre-to-centre. On the board layout, that pitch gives you room to route a trace between adjacent pads if needed, and the through-hole pads should be sized for a snug solder joint. Wire preparation is the same as any screw-clamp terminal: strip 14-22 AWG to the length recommended for the clamp, insert fully, torque the screw. The zinc clear chromate finish on the screw resists corrosion in humid cabinet environments, and the steel screw gives consistent clamping force without galling.