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The green LED lights up when the supply voltage is applied. If any phase voltage exceeds \n195 V (US1) or exceeds the preset threshold (US2) with respect to the neutral including the hysteresis when the unit is switched on, the relay switches \nsimmediately to the operating position. The yellow LED lights up. If at least one phase voltage drops below the threshold, the relay returns to its normal position and the yellow LED goes out. If phase 2 also fails, the green LED also goes out.\nThe neutral conductor must be connected!
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