1、Three phase voltage protector, chronograph and counter are integrated into one relay. 2、It is equipped with protective functions for over‑voltage, under‑voltage, loss of phase, phase sequence and unbalanced three phase voltage. 3、No external power requires. 4、With useful functions: electricity delay, output test, etc. 5、The LCD can show the data for easy reading. Features: No external power requires. With useful functions: electricity delay, output test, etc. The LCD can show the data for easy reading. Specification: Model: JVR 800-2 Monitoring Circuit: L1, L2, L3 Overvoltage setting range: 200-600V Undervoltage setting range: 150-500V Delay time for overvoltage and undervoltage: 0.1-30s Delay time for phase loss: 0.1-30s Delay time for phase sequence: 0.1-30s Start delay time: 0-999s Auto reset mode: ON/OFF Auto reset time: 0.1-999s Timer and counter input: AC/DC 80-450V Output contacts: 1 C/O,1NC Contact capacity: 6A ,250VAC Dimensions (H*W*D): 80*43*54mm/3.15*1.69*2.12inch Mounting: suitable for 35mm rail Weight: 129g Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1 x 3 Phase Voltage Monitoring Relay