This relay monitors its own operating voltage with true measurement. Features 8 types of adjustable rated voltage. Voltage measurement accuracy is within 1%. LED indicators display the relay's working status. Super-compact volume allows for mounting on a 35mm DIN rail. Applications: Equipment protection and control (towers, elevators, agricultural equipment, refrigerated trucks); reverse running protection; normal/emergency power supply; phase failure protection for dynamic loads. Function: Monitors L-L voltage (3-phase 3-wire system). Monitoring Terminal: L1-L2-L3. Power Supply: L1-L2. Rated Operating Voltage: 220-230-240-380-400-415-440-460(P-P). Rated Power Frequency: 45Hz-65Hz. Measurement Range: 176V-552V. Voltage Range: 2%-20% (rated voltage). Voltage Fixed Speed: 2%. Voltage Measurement Error: Less than 1%. Power-on Delay Time: 0.5s. Knob Setting Accuracy: 10%. Reset Time: 1s. Temperature Fluctuation Error: 0.05%/°C, at 20°C. Output: 1 x SPDT; 10A/AC1; 250VAC/24VDC. Minimum Switching Current: 500mW. Overvoltage: 2%-20%. Undervoltage: -20%-2%. Action Delay Time: 0.1-10s adjustable. Phase Sequence Protection: Yes. Phase Failure Protection: Yes. Power Indicator: Green LED. Output Relay Indicator: Red LED. Mechanical Lifespan: 1x107. Mounting: 35mm DIN rail mounting. Mounting Height: Less than 2000m. Weight: Approx. 78g/2.7oz. Size: 95*18*64mm. Color: White. Material: Plastic. Package Contents: 1 * Voltage Monitoring Relay, 1 * Instructions. (Note: Other items shown are not included. Light and monitor differences may cause slight color variations.)