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More magic words are "high side switch"https://html.duckduckgo.com/html?q=high+side+switchThese are (usually) glorified MOSfet's with built in level conversion for the gate signal and extra protection circuitry against over current and over temperature.Another possibility are "photo mos" relays. These have an IR diode, some photovoltaic cells and power MOSfets. The photovolaic cells then provide the gate voltage for the FET's.If you put two N-channel MOSfets back to back such as in the circuit that strawberry posted, then you can also control them with a small isolated SMPS circuit.