1This relay can monitor own working voltage (true RMS measurement). 28 kinds of adjustable rated voltage. 3Voltage measurement accuracy is not more than 1%. 4Relay working status is indicated by LED indicators. 5With super small volume, this relay can be mounted on 35mm DIN rail.Features: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 1%.4.Relay working status is indicated by LED indicators.5.With super small volume, this relay can be mounted on 35mm DIN rail.6.Application: Equipment protection and control(tower crane, elevator, agriculture equipment, refrigerated trucks); Protect equipment from reverse running; Normal/emergency power supply switch; Protect against phase failure of a dynamic load.Specification:Function: Monitor L-N voltage (3-phase 4-wire system)Monitoring terminal: L1-L2-L3-NPower: L1-NRated working voltage: 127-132-138-220-230-240-254-265 (P-N)Rated power frequency: 45Hz-65HzMeasuring range: 101V-318VVoltage threshold range: 2%-20% (rated voltage)Voltage fixed lag rate: 2%Voltage measurement error: 1%Power-on delay time: 0.5s Knob setting accuracy: 10%Reset time: 1sTemperature fluctuation error: 0.05%/C, at=20COutput: 1 x SPDT; 10A/ AC1; 250VAC/24VDCMinimum switching power: 500mWOvervoltage: 2%-20%Undervoltage: -20%-2%