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Not the one I had in mind, but very similar and definitely much cooler looking. The kits like these are still made and sold in various countries.

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One of my kiddos loved SnapCircuits. Similar, but more kid friendly.

https://elenco.com/snapcircuits/

Went around the internets to find the one I thought of and while I can't find it - doesn't surprise me - it was something very much like a cross between Denshi Block (connectors) and Braun Lectron (aesthetics)

https://de.wikipedia.org/wiki/Lectron

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