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24 VDC is the standard for control circuits because it provides increased safety, dependability and interoperability with modern automation systems.
At 24 VDC the risk of electric shock is low which makes it safer for operators & maintenance people operating inside control panels.
This low voltage also lowers the risk of insulation failure & inadvertent short circuits.
From a technical aspect an 24 VDC provides a steady and noise-resistant control signals which are required by
Whereas 230 VAC DC control circuits are less susceptible to electromagnetic interference (EMI) resulting in accurate signal transmission and dependable functioning.
Additionally, 24 VDC is a global industrial standard that can be easily obtained from SMPS power supplies and enables for the smooth integration of field devices that include proximity sensors, solenoid valves and I/O modules.
For these reasons, 24 VDC is now preferred over 230 VAC in modern control & automation systems.
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