The 2351886-2: The 0.138" (3.50 mm) pitch sets the pad spacing on the PCB — standard for Buchanan terminal block headers, so the footprint matches common 3.50 mm pluggable terminal blocks like the TE 284604 series. Rated 12 A per circuit under UL conditions — the current ceiling before the temperature rise exceeds the housing material limit. At 105°C max operating, derate if the ambient inside the enclosure runs above 85°C. Tin mating finish on the pins: cost-effective for infrequent disconnect cycles. In a panel that gets mated once at install and stays, tin is fine. For quarterly reconnects in a corrosive environment, gold would be the better call.
Shrouded header — what it protects against
The 0.362" (9.20 mm) insulation height gives the shroud enough depth to guide the mating plug square-on. Vertical orientation, through-hole solder termination: the pins sit straight up from the board, so the plug mates from above. The 0.134" (3.40 mm) contact tail length is enough for a standard 1.6 mm PCB — the solder joint sits proud of the bottom pad.
The base product number 2351886 covers the series; this variant is the 2-position, vertical, tin-plated version.