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EXAMPLE: a basic Legrand din-rail 3ma differential main breaker I saw just today, 231 EUROS = US$320!! ],

If it's 3mA I understand the price wink
30mA go around 50 Euros here (2 or 4 pole, 30mA, max. 40A). And I thought the electrician who wanted 140 was crazy... maybe attempting to sell an S or G type.