We had things like that in our school labs.
The tables had a trunk with special plugs and you could plug in whatever box you wanted. Three boxes I particularly remember: 220V AC 50 Hz, 16A (i.e. 6 standard Schuko receptacles and a circuit breaker, and IIRC banana jacks), 0...220V DC 10A and the biggest one, 0...220/380V 3ph AC with a variable transformer. Once we used that beast to recreate the old 127/220V 3 phase system... well more or less accidentally. We got 3 capacitors and were told to adjust the voltage to get the nominal current of 1A... and they were built for 220V line voltage, so whe we just watched the amp meter we accidentally got the right voltage.
