Feature: 1. Overvoltage protection. Suitable for three ‑ phase four ‑ wire power system. 2. Undervoltage protection. Suitable for electrical equipment monitoring and auxiliary protection device instrument. 3. Neutral line break protection. The line appears over voltage or under voltage, over current state, the product can instantly cut off the power supply. 4. Phase break protection.Protect electrical equipment from damage. 5. Phase sequence protection: positive phase sequence protection and negative phase sequence protection (optional). 6. Three‑phase voltage imbalance protection. Complete functions, stable performance, easy operation. Specification: Condition: 100% Brand New Item Type: Voltage Protection Device Material: Plastic Optional Type: 50A, 63A, 80A Model: STVP ‑ 930 Line Voltage: 230V/400VAC 50/60Hz Rated Current: 50A,63A,80A Boot Self‑Test Time: 2 seconds Power On Delay Time: 40 seconds Over Voltage Protection Value Ranges: 280V±5V Over Pressure Recovery Value Ranges: 250V±5V Under Voltage Protection Value Ranges: 170V±5V Under Voltage Recovery Value Ranges: 185V±5V Over Undervoltage Protection Action Time: 0.1 second Failure Delay Recovery Time: 40 seconds Power Off Protection Time: 0.1 second Three‑phase voltage imbalance protection value range 35%(default protection value), 25%(recovery value) or custom Operation time of three‑phase voltage imbalance protection is 0.1 second Power Consumption: ≤3VA Status display LED(three‑phase independent indicator) Sampling mode Phase line sampling of neutral line resistance at partial voltage AC Grounding system TT, TN‑S, TN‑C‑S Installation Mode: Guide rail installation Electrical Isolation: 2000VAC pulse: 2.5KV 1.2/50μS Working Environment Temperature ‑20℃~50℃ humidity < 85% altitude: not more than 2000m Description: STVP series SINOTIMER automatic reset over‑undervoltage multi‑function protector is an instrument suitable for monitoring and auxiliary protection of three‑phase four‑wire power system or electrical equipment.Its main characteristics are that the line appears overvoltage or undervoltage, overcurrent state, the product can instantly cut off the power supply, protect the electrical equipment from damage;When the line voltage returns to normal, the protector can automatically switch on the power supply.The protector integrates overvoltage protection, undervoltage protection, overcurrent protection, three‑phase current (voltage) imbalance protection, phase sequence protection (mismatch protection), neutral break protection, break phase protection, with fault query function, voltmeter and ammeter function, as well as restore factory setting function.The product has complete functions, stable performance and easy operation.. Package List: 1 x Voltage Protection Device1 x Manual Note: 1. This product has no isolation function. Please disconnect the front circuit breaker switch when repairing the circuit.2. The N line of this product is directly connected without disconnecting function.3. The protector is free from overload and short circuit protection, and the circuit breaker should be installed at the front end of the circuit.4. This product has no effect on the 0 break protection after normal operation of the motor and other generator loads.