These state-of-the-art panel meters are designed for accurate measurement of the AC RMS voltages and frequency in three-phase systems. Although they are mainly used in electrical panels, these devices can also be integrated in many other applications. Devices have separate inputs for supply and measurement with common neutral point. Through front panel button, phase–to-phase (L1-L2, L2-L3, L3-L1) and phase-to-neutral (L1-N, L2-N, L3- N) voltages and frequency can be selected and read from the display. Automatic parameter scroll is also available. TECHNICAL SPECIFICATIONS: Power Supply Input: 170 - 275VAC 50 - 60Hz nominal (± 10%) Different AC/DC supply values available. Measurement Inputs: 10 - 300 V AC (Phase-Neutral) 20 – 520 V AC (Phase-Phase) 30 - 100 Hz Accuracy: 0.5% + 1 digit Power Consumption: < 1.5W Burden: < 0.1VA per phase Operating Temperature: -40°C ;+70 °C Maximum Humidity: 95% non-condensing. Degree of Protection: IP 54 (Front Panel) IP 30 (Back panel) Enclosure: Non-flammable, ROHS compliant, high temperature ABS/PC (UL94-V0) Installation: Flush mounting with rear retaining brackets Dimensions: 78x78x41mm (WxHxD) Panel Cutout Dimensions: 68x68mm Weight: 145 gr EU Directives Conformity: 2006/95/EC (low voltage) 2004/108/EC (EMC) Norms of reference: EN 61010 (safety requirements) EN 61326 (EMC requirements) WE DO NOT SHIP THIS PRODUCT TO USA AND CANADA