On the subject of Wago connectors, for many years Ideal has had a line of similar connectors that do not have levers and are slightly smaller.
Mucking around on the internet, I came across a video in which a man makes up a length of what appears to be 12-gauge wire, with a series of splices---wago connector, crimp connector, wire nut, Euto-style screw connector---and then fed 70+ amps through it for awhile. Melted the insulation off the wire, and the Wago was the first connector to smoke.
