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A selection of Wago connectors.

Wago connectors are a common proprietrary form of spring connector, coming in several different types. They are designed for commoning two or more wires, for mains or for low voltage use. Some have a lever to lift or to press to release the spring, but with others, you just push the wire in, and there's no visible means of releasing it. The trick with these is to twist the wire back and forth while pulling it firmly.