Specifications: Item Type: Adjustable Voltage Protector Material: Plastic Model: STVP-932 Three-phase four-wire with Rated Voltage: 230V/400VAC, 50/60Hz Rated Current: 50A, 63A, 80A (Optional) Overvoltage Protection Value Range: 221V-300V-OFF (Default 280V) Overvoltage Recovery Value Range: 220V - 299V (Default 250V) Overvoltage Protection Action Time is Adjustable: 0.1 seconds to 10 seconds (Default 0.2 seconds) Undervoltage Protection Range: 219V-150V-OFF (Default 160V) Undervoltage Recovery Value Range: 220V - 151V (Default 180V) Voltage Protection Action Time is Adjustable: 0.1 seconds to 10 seconds (Default 0.2 seconds) Three-phase Voltage Unbalance Value Range: 10% -50% -OFF Phase Voltage Unbalance Protection Action: 0.1 seconds to 10 seconds (Default 1.0 seconds) Power-on Delay Time: 2-255 seconds (Default 2 seconds) Fault Response Time: 2-512 seconds (Default 60 seconds) Display Mode: LCD Fault Display: Segment Code Sampling Method: AC sampling of partial pressure between phase line and neutral line resistance Grounding System: TT, TN-S, TN-CS Installation Method: Rail installation Electrical Insulation Strength: > 2000VAC, Pulse 2.5kV 1.2/50 μS Working Environment: Temperature -20℃ ~ 50℃, Humidity < 85%, Altitude: Not more than 2000 meters Size: Approx. 72 x 80mm/2.8 x 3.1in, 65mm/2.6in, 43mm/1.7in, 45mm/1.8in, 35mm/1.4in Package List: 1 x Adjustable Voltage Protector 1 x User Manual