I've been working with power plant and factory controls for thirty years, terminals blocks are something I deal with almost daily. The quality of these terminals is not on par with what we use in our PLC/DCS/SCADA systems; the materials are too soft and the insulator bodies deform with little force applied at the screw. These are stamped CE and ROHS, but I don't see any UL or FM so I can't use them at work for insurance reasons anyway.
They are still good for home projects though, and the stuff I work with is dozens of times the price. Its why I bought these, I can't afford the stuff I work with.... I would put these in 48 volt or less systems carrying signal but not power. They have a locking side on the plastic block, use it in pairs or more to add mechanical strength to the installation. I'm guessing these were destined for life in phone service before I put them in my remote controlled airplane.
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