This state-of-the-art panel meter is designed for accurate measurement of the AC RMS voltages and frequency in single-phase systems. Although he is mainly used in electrical panels , this device can also be integrated in many other applications. Device have separate inputs for supply and measurement with common neutral point. Through front panel button voltage 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