These state-of-the-art panel meters are designed for accurate measurement of the AC RMS voltages and frequency in single-phase and 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 buttons, 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: 96x48 models: 102x54x41mm (WxHxD) 72x72 models: 78x78x41mm (WxHxD) Panel Cutout Dimensions: 96x48 models: 92x44mm 72x72 models: 68x68mm Weight: 125 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