Siemens Digital monitoring relay, 3-phaseProduct Overview Advanced digital monitoring relay designed for comprehensive three phase line voltage monitoring with configurable phase sequence detection capabilities. This SIRIUS 3UG4 series monitoring relay provides dual channel voltage protection with independent undervoltage (Umin) and overvoltage (Umax) monitoring across a wide voltage range of 160 690 V AC. The device features digital adjustment capabilities with LCD display, fault memory
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