Municipal electric power over-voltage, under-voltage automatic indication protection circuit

Published:2011/5/13 3:56:00 Author:Nicole | Keyword: municipal electric power, over-voltage, under-voltage | From:SeekIC

When the municipal electric power is higher than the upper limit which is set by W1, LED2 is lightening, gate 2 is latched, outputing 1 , J pulls in, NC contact cuts off, to fulfill the purposes of power-off protection. When mains supply is lower than the lower limit value set by W2, gate 4 opens, LED1 is on, gate 3 outputs 0 , then J pulls in, it also can protect current failure.



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