Does polarity matter for an RCD?

[Steve T]

Hi all,
I recently was given an old 2 pole Legrand RCD meant for the European market but it doesn't have any indication of which side is neutral and live, and also doesn't indicate which side the supply and load go into. A picture is attached. I've looked at the data sheet which doesn't provide any info.

Does that mean the polarity is not important nor which side the supply and load go into?

Thanks for any replies!

 

[brianmoooore]

I don't see how this would work at all. The entire load current would be sensed twice as an imbalance so the RCD would trip at 15mA load.

Maybe it did, but this was a 100mA RCD IIRC, so 50mA. Wouldn't be a problem with an installation in good order.
I replaced the RCD, and moved the neutral in to the top, as it should have been.