Function: 1. STVP series multifunctional surge and undervoltage protection with automatic reset is a monitoring device and auxiliary safety device, suitable dla three-phase four-wire power system or electrical equipment 2. When there is a state of overvoltage, undervoltage or overcurrent on the line, this product can immediately cut off the power supply to protect the electrical equipment from damage; when the mains voltage returns do normal, the protection can automatically turn on the normal power supply 3. This protection combines overvoltage protection, undervoltage protection, overcurrent protection, protection against three-phase current asymmetry (voltage), phase order protection (phase shift protection) and phase break protection 4. The product has the function of checking faults, voltmeter and ammeter and the function of factory reset 5. Adjustable voltage protection for full functionality, stable operation and easy operation Specification: Item Type: Adjustable Voltage Protection Material: plastic Model: STVP-932 Rated voltage three-phase, four-wire: 230 V/400 V AC, 50/60 Hz Surge protection value range: 221 V-300 V-OFF (default value 280 V) Voltage recovery value range: 220 V-299 V (default value 250 V) Surge protection duration is adjustable: 0,1 seconds – 10 seconds (default value is 0,2 seconds) Undervoltage protection value range: 219 V-150 V-OFF (default value 160 V) Undervoltage Restoration Value Range: 220 V-151 V (default value 180 V) The operating time of the undervoltage protection is adjustable: 0,1 seconds – 10 seconds (default value 0,2 seconds) Protection value range against three-phase voltage asymmetry: 10%-50%-OFF Operating time of protection against phase voltage asymmetry: 0,1 seconds - 10 seconds (default value 1,0 seconds) Power on delay time: 2 to 255 seconds (default value is 2 seconds) Disaster recovery delay time: 2 to 512 seconds (default value is 60 seconds) Display Mode: LCD Error Indication: Segmented Character Sampling method: sampling of AC partial pressure of phase line resistance do neutral line Grounding system: TT, TN-S, TN-C-S Installation Method: Rail Installation Electrical insulation strength: >2000VAC, pulse 2,5KV 1,2/50μS Working environment: temperature -20 50 , humidity <85%, altitude: not more than 2000 meters Size: approx. 72 x 80 mm / 2,8 x 3,1 inches, 65 mm / 2,6 inches, 43 mm / 1,7 inches, 45 mm / 1,8 inches, 35 mm / 1,4 inches List of packages: 1 x Adjustable Voltage Protection 1 x User Manual