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Compact NSX range has Uimp of 8 kV. Following IEC-60947-1 / 60947-2 standard, 1,2/50 us impulse wave and power-frequency withstand voltage test are performed on the breaker.
For the power-frequency withstand voltage test at 50 Hz, the voltage depends on the rated insulation voltage Ui (as illustrated in attached document), which is 800V for Compact NSX:
Rated insulation voltage Ui : AC test voltage (R.M.S)
60 < Ui ≤ 300 : 1500
300 < Ui ≤ 690 : 1890
690 < Ui ≤ 800 : 2000
800 < Ui ≤ 1000 : 2200
So for Compact NSX the value of this voltage is 2000 V for 1 minute.