1. AUTOMATIC RECOVERY: The protector has an automatic recovery function that can prevent long-term power outages and ensure its lifespan. 2. FAST RESPONSE TIME: The protector has a fast response time and sensitive internal components, saving your working time and making it more convenient. 3. DIGITAL DISPLAY: The digital display shows the working voltage and current in real time, you can monitor the deviation and use it with confidence. 4. EASY INSTALLATION: This three-phase protector is installed on a DIN rail, simple and easy to use, stable and firm after installation. 5. SAFE USE: When the protector is overloaded, it will automatically cut off the power supply, and the power is supplied normally within the specified power, to avoid the danger of overvoltage and undervoltage. Specification: Item Type: Three-phase DIN Rail Voltmeter. Material: PC Model: CHSG 63 Load Current: 1-63A Overvoltage Setting Value: AC390-500V Undervoltage Setting: AC370V-140V Shutdown Time (Set 1-300s): 5-300S(V), 30-300S(I) Placement: Approx. 35mm x 1.4in DIN Rail Package List: 1 x Three-phase DIN Rail Voltmeter 1 x Instruction