Feature: No additional auxiliary power supply is required. 1 CO & 1NC contacts, over-voltage and under-voltage protection. Standard modular structure, guide rail type installation. Over-voltage value and act ion time can be adjusted. Ac/dc voltage universal, automatic identification of ac/dc voltage, no need to switch. 3 Reset modes: manual, automatic, automatic with power-on delay. Built-in LCD Chinese display voltage value, fault status, setting parameters. Fault recording function. Real-time monitoring of single phase over-voltage and under-voltage fault. Output test function. Specification: Model: SVR1000/AD48/AD220 Optional Type: AD48, AD220 Monitoring Circuit: L(+),N(-) Rated Voltage: AC/DC 24V-48V 50/60Hz Protection Function: Over-voltage, Under-voltage Over-voltage Adjustment Range: AC/DC 20V-80V,OFF Under-voltage Adjustment Range: AC/DC 0.1V-30V Over-voltage / Under-voltage Ac tion Range: 0.1-999s Reset Mode: manual, automatic, automatic with power-on delay Reset Time: 0.1-999s Display: Chinese LCD Contact Form: 1 CO & 1NC Contact Capacity: 6A 250VAC Size: Approx. 80*43*54mm/3.1*1.7*2.1in Installation: 35mm Guide Rail Typical Application Scope: electric motor, blower, water pump, air compressor, crane, travelling crane, lifter, elevator, machine tool, central air-conditioning, refrigeration equipment, lasers equipment, industrial control system Package List: 1 * Over-voltage Under-voltage Relay Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Manual measurement, please allow 1-10mm error. Thanks for your understanding. No additional auxiliary power supply is required. 1 CO & 1NC contacts, over-voltage and under-voltage protection. Standard modular structure, guide rail type installation. Over-voltage value and act ion time can be adjusted. Ac/dc voltage universal, automatic identification of ac/dc voltage, no need to switch. 3 Reset modes: manual, automatic, automatic with power-on delay. Built-in LCD Chinese display voltage value, fault status, setting parameters. Fault recording function. Real-time monitoring of single phase over-voltage and under-voltage fault. Output test function.