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ABB QT715A-E GJR2348200R0002 with factory sealed box QT715A/E

We can normally achieve total discrimination only in specific cases where the fault current is not very high (and comparable with the device’s rated current) or where a component with high impedance is between the two protective devices (e.g. a transformer, a very long or small cable...) giving rise to a large difference between the short-circuit current values.

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