SIEMENS 3UG5618-1CR21 – digitally adjustable monitoring | JUAL SIEMENS 3UG5618-1CR21 – digitally adjustable monitoring relay phase failure, phase sequence, asymmetry, frequency, over- and under-voltage monitoring with phase sequence correction 3x 90-690 V AC, 15-70 Hz 2 changeover contacts screw terminal SIL 1/PL c