3-phase DIN rail voltmeter power meter, AC 390-500V digital ammeter automatic overvoltage overcurrent protection, 3-phase watt-kWh-ampere electricity tester (40A)

"SICHER ZU VERWENDEN: If the protector is overloaded, it will automatically interrupt the power supply and the power supply will be restored normally within the specified power to avoid the danger of overvoltage and undervoltage. SCHNELLE REAKTION: The protector has a fast response speed and sensitive internal components, saving you time and making it more practical. EINFACHE INSTALLATION: This 3-phase protection is installed on a DIN rail, which is easy and easy to use and stable and firm after installation. DIGITALE ANZEIGE: The digital display screen shows the working voltage and current in real time, allowing you to monitor any anomalies and use with confidence. AUTOMATISCHER RESET: The protector has an automatic reset function to prevent long-term power outages and ensure its lifespan."