Features: _x000D_ 1. This relay can monitor own working voltage (true RMS measurement). _x000D_ 2. 8 kinds of adjustable rated voltage. _x000D_ 3. Voltage measurement accuracy is not more than 1%. _x000D_ 4. Relay working status is indicated by LED indicators. _x000D_ 5. With super small volume, this relay can be mounted on 35mm DIN rail. _x000D_ 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. _x000D_ _x000D_ Specification: _x000D_ Function: Monitor L-N voltage (3-phase 4-wire system) _x000D_ Monitoring terminal: L1-L2-L3-N _x000D_ Power: L1-N _x000D_ Rated working voltage: 127-132-138-220-230-240-254-265 (P-N) _x000D_ Rated power frequency: 45Hz-65Hz _x000D_ Measuring range: 101V-318V _x000D_ Voltage threshold range: 2%-20% (rated voltage) _x000D_ Voltage fixed lag rate: 2% _x000D_ Voltage measurement error: 1% _x000D_ Power-on delay time: 0.5s _x000D_ Knob setting accuracy: 10% _x000D_ Reset time: 1s _x000D_ Temperature fluctuation error: 0.05%/C, at=20C _x000D_ Output: 1 x SPDT; 10A/ AC1; 250VAC/24VDC _x000D_ Minimum switching power: 500mW _x000D_ Overvoltage: 2%-20% _x000D_ Undervoltage: -20%-2% _x000D_ Unbalanced voltage: 8% _x000D_ Action delay time: 0.1-10s adjustable _x000D_ Phase sequence protection: Yes _x000D_ Phase failure protection: Yes _x000D_ Power indicator: Green LED _x000D_ Output relay indication: Red LED _x000D_ Mechanical life: 1x107 _x000D_ Mounting method: 35mm DIN rail mounting _x000D_ Mount altitude: 2000m _x000D_ Weight: Approx. 76g/2.7oz _x000D_ _x000D_ Package list: _x000D_ 1 * Voltage Monitoring Relay