Switch mode psu ground fault. Need help.

[coolben]

Got this cheapo 24VDC 10A smps from ebay.

When I wire up live, neutral and gnd and insert the plug into wall socket, the circuit breaker trips instantly without turning on the wall socket switch...


I'm ruling out short circuit and inrush current because I haven't even turned the damn thing on. So ground fault?

Without gnd wired up, the trip does not occur, but I am reluctant to switch it on as the case might be electrified.

Testing with dmm shows that:
-Gnd screw terminal is in good electrical contact with case: 0.1ohm
-Live and case: 5 mega ohm
-Neutral and case: 5 mega ohm

Is 5 Mohm decent enough isolation? Or is this the reason why the circuit is tripping?

Breaker is a ground fault interrupter that trips at 30mA. I'm having trouble understanding how it can have 30mA of leakage current through 5Mohms without being switched on...

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[jtjt00]

The AC input is 110v or 230v?

 

[coolben]

Selector between 110 and 220.
Made sure to select 220

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[commach]

Which breaker tripped?

MCB
ELCB
One pole breaker

 

[coolben]

Elcb

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