Instrument power distribution: 380V to 24V
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The power supply voltage is 380V; what electrical components or methods should be used to supply power to instruments that require 24V?
Siemens SITOP PSU300B: 380V AC input, 24V DC output
It depends on how much you’re willing to spend and whether it’s inside the cabinet or elsewhere; if it’s fine, use a conversion module that converts 380VAC to 24VDC. If you want something cheaper, use a single-phase 380V supply along with a module that converts 220VAC to 24VDC
If you only need 24V, does the 380V input require a neutral wire? If there is a neutral wire, take one phase together with the neutral wire; this will give 220V. A switching power supply will suffice, and it also depends on your capacity requirements ； Another option is a dedicated control transformer, which is not large in size; it can convert voltage from 380V to 220V or 24V. There’s also the more advanced switching power supply mentioned earlier
It is inside the power distribution cabinet; the incoming voltage to the cabinet is 380V, and it is necessary to supply power to the 24V instruments
Simply put: Take one phase from a 380V three-phase power supply and connect it to a circuit breaker. Get a 220V circuit breaker, and then buy a converter that turns 220V into 24V; it costs just a few dozen yuan. More complex case: Power conversion modules that convert 380V directly to 24V are relatively expensive. Around 400 yuan. I still think something simpler is more appropriate.