It is time to give these things the Kleenex or "Band-Aid" treatment and just call them WAGOs.
They have the potential to [almost] totally replace wire nuts. But they are new and have to pass the test of time. They are rated by UL, et al. for amperage but who knows for how long?
To remove a wire from them, you pull and rotate or twist the wire simultaneously. Perhaps make a crank handle out of the wire.
As for the construction of the contacts inside. There are at least two types of "backstab" connections. If I could post pictures, I could illustrate. In one type, the wire is pressed into a V grove and in the other, the wire is pushed into a slightly smaller hole in a spring making contact only on the edges of the spring. WAGOs are of the former type and this seems to be the better option of the two. Spend 39 cents and break apart a cheap, back stab receptacle and see what I mean for the lesser version. Some of the WAGOs are clear and you can see the inner workings.
But compare the thickness of the metal with a cross section of #14 copper wire which is accepted to carry 15 amps [but should be limited to 12 amps, not 14] indefinitely. Draw your own conclusion.
~Peter
