The 68683-320LF: The post side is tin-plated at 100 µinch, which wets well during wave solder.
Voltage Headroom and Flame Rating
Rated 1000 V — the creepage distance between rows is generous for industrial bus voltages.
This is a push-pull (unlatching) receptacle — it mates with any Dubox™ or compatible 0.100" pitch square-pin header. The through-hole solder termination requires no press-fit tooling; just insert and wave-solder.
The 40-position version gives you four extra circuits in the same row spacing, which matters if your board layout needs that additional I/O without widening the connector footprint.