| Item Description | SPI1021, grid and plant protection, AC/DC 24-270V / na-box, grid- and plant protection acc. To cei 0-21 (italy) certificate of compliance from bureau veritas voltage and frequency relay monitoring of over- and underfrequency, voltage and 10-MINUTES-AVERAGE monitoring of vector-shift measuring ranges 40-520 V / 45-65 HZ measuring of true RMS output relay 2 x changeover contacts display of operating status with leds alarm counter for up to 100 alarms with value, reason and elapsed time code protection and sealing for settings housing width 105 MM, mounting height 55 MM snap-on mounting on DIN-rail or with screws (option) supply voltage AC/DC 24-270 V |