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ABB ABB DI620 3BHT300002R1 with factory sealed box

 the rarefaction of the air causes a decrease in dielectric rigidity, so the usual isolation distances become insufficient. This leads to a decrease in the maximum rated voltage at which the device can be used. The correction factors for the different types of circuit-breakers, both mouldedcase and air circuit-breakers, are given in the following table:

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