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What does the LED indicator mean on an 8430MPD phase failure relay ?

What is the function of the LED on the 8430 type MP relays? 

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Monitoring Relays

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Upon application of the proper 3 phase voltage the Type MPD relay will energize and the LED will turn ON. The LED will turn OFF and the relay will de-energize and remain dropped out as long as any of the following incorrect conditions exist: Phase Loss, Phase reversal, Voltage Unbalance and Undervoltage.

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