[Tom Line]

You'll find a good description of the connectors here:
http://www.fightingpi.org/Resources/...20Module.shtml

manufacturer:
http://catalog.weidmueller.com/catal...15980277147218

With the right wire you don't need to push the button to insert it, but we've found most stranded wires require us to push the button. You also need to strip the correct amount of insulation, but really that's not any different than other connection styles.