Function: 1. AUTOMATIC RESET: ma automatic reset function, which can prevent long-term power failure and ensure its service life. 2. FAST RESPONSE: The ma quick response and sensitive internal components, saving working time and making it more practical. 3. DIGITAL DISPLAY: Digital screen displays working voltage and current in real time, you can monitor irregularities and use it with confidence. 4. EASY INSTALLATION: This 3-phase protector is installed on the DIN rail, which is simple and easy to operate, and after installation it is stable and strong. 5. SAFE TO USE: When the protection is overloaded, it will automatically cut off the power supply, and the power will be supplied normally at the specified power to prevent the danger of overvoltage and undervoltage. Specification: Item Type: 3-Phase DIN Rail Voltmeter Material: PC Model: CHLT 63 Load Current: 1-63A Surge Setting Value: AC390-500V Undervoltage setting: AC370V-140V Shutdown time (set 1-300s): 5-300S(V), 30-300S(I) Installation: Approx. DIN 35 mm x 1,4 inch rail List of packages: 1 x 3-phase DIN rail voltmeter 1 x manual