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24VDC Power Supplies & Leakage Current

Les Spiteri
Hi, looking for some thoughts.


I recently had a customer asking for an RCBO upstream of a 24VDC power supply (i.e. on the 240Vac incoming) and I thought "never seen that before".
  • What possible reason is there for doing this?

  • Would this be considered "safer" than using an MCB?

  • What would happen without RCBO one if there was leakage inside the 24Vdc power supply?

  • Only time I have previously used RCBOs was where you provide a socket in enclosures as per all guidelines now.


Thanks Folks

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  • 0
    It would be a switch mode power supply and SELV,  I usually earth the 0V of the output of the power supply. I had been taught to do this many years ago as it means that any single fault condition short to 0V trips the circuit. Off topic slightly but that still means its SELV correct?
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  • 0
    It would be a switch mode power supply and SELV,  I usually earth the 0V of the output of the power supply. I had been taught to do this many years ago as it means that any single fault condition short to 0V trips the circuit. Off topic slightly but that still means its SELV correct?
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