Characteristic: 1. AUTOMATIC RESET: The protector features an automatic reset function, which can prevent long-term power failure and ensure its lifespan. 2. FAST RESPONSE: The protector is characterized by fast response and sensitive internal components, which saves working time and makes it more practical. 3. DIGITAL DISPLAY: Digital display displays voltage and operating current in real time, you can monitor irregularities and use them safely. 4. EASY INSTALLATION: This 3-phase protection is installed on the DIN rail, which is simple and easy to operate, as well as stable and strong after installation. 5. SAFE TO USE: When the protector is overloaded, it automatically cuts off the power supply, and the power will be supplied normally within the specified range to prevent the danger of overvoltage and undervoltage. Specification: Item Type: 3 Phase Voltmeter for DIN Rail Material: Computer Model: CHSG 40 Load Current: 1-63A Surge Setting Value: AC390-500V Undervoltage setting: AC370V-140V Power off time (set 1-300 s): 5-300 s (V), 30-300 s (I) Installation: approx. DIN 35 mm x 1,4 inch rail List of packages: 1 x 3-phase DIN rail voltmeter 1 x manual