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about spec of VDE  0884-10

Hi there,

I have a question about "VDE  0884-10 :2006-12".

According to iCoupler datasheets,

I can find VIORM spec, but I just wondered why each parts has a different VIORM voltage just  as following.


Even if the same VDE certificate, is there any reasons that VIORM  varies on each devices?

And what is beneficial for application's aspect if the VIORM voltage is higher?

Please give me some advice on that.

Best regards,