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ABB DSPC172 57310001-ML with factory sealed box

Furthermore, gradually decrease the current until the re-lay resets, i.e. the alarm output relay I> is disengaged. Check that the resetting current is smaller than 0.97 times the operating current. Repeat the test on phase 2, phase 3 and earth current input circuits in the same manner.(Accuracy of earth current measuring ±3% of measuring value 

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