Fangrui Product Details 1. This Relay Can Monitor Own Working Voltage (true Rms Measurement). 2. 8 Kinds Of Adjustable Rated Voltage. 3. Voltage Measurement Accuracy Is Not More Than . 4. Relay Working Status Is Indicated By Led Indicators. 5. With Super Small Volume, This Relay Can Be Mounted On 35mm Din Rail. Application: Equipment Protection And Control(tower Crane, Elevator, Agriculture Equipment, Refrigerated Trucks); Protect Equipment From Reverse Running; Normal/ Power Supply Switch; Protect Against Phase Failure Of A Dynamic Load. Function: Monitor L-l Voltage (3-phase 3-wire System) Monitoring Terminal: L1-l2-l3 Power: L1-l2 Rated Working Voltage: 220-230-240-380-400-415-440-460(p-p) Rated Power Frequency: 45hz-65hz Measuring Range: 176v-552v Voltage Threshold Range: - (rated Voltage) Voltage Fixed Lag Rate: Voltage Measurement Error: Less Than Equal Power-on Delay Time: 0.5s Knob Setting Accuracy: Reset Time: 1s Temperature Fluctuation Error: 0./c, At=20c Output: 1 X Spdt; 10a/ Ac1; 2