Product Manual 2014

68 German Production & Technology Low voltage monitoring relays, series USR Low and high voltage monitoring relays, series UER Principle of operation If in one,two or three phases,the rated voltage drops or exceeds Ue then the relay switches back to its rest position. If the switching point is above Uso then the green LED extinguishes and the yellow LED U>Us lights up. If the switching point is below Usu then the green LED extinguishes and the yellow LED U

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