Technical Specifications Basic Identification Brand: Alstom / Areva T&D Full Model: VAGM22AF171G Relay Type: Instantaneous Undervoltage Relay Auxiliary Rated Supply: 110 VAC, 50 Hz Wiring Schematic Code: MADZ602.15-2 Internal Drawing Ref: MZG 0072-003A Application: MV substation busbar protection, transformer control, traction power grid undervoltage lockout Electrical Operating Parameters Rated Control Voltage (Vn): 110 VAC, 50 Hz Operating Frequency Range: 45–55 Hz Undervoltage Pick-up Setting Range: 70% ~ 95% × Vn adjustable Instantaneous Operation Characteristic: Zero intentional time delay, fast trip response <20ms Reset Voltage Threshold: ≥102% of nominal supply voltage Coil Burden Power Consumption: ≤8 VA at rated 110VAC Voltage Tolerance for Continuous Operation: 80% ~ 115% Vn Contact Configuration & Load Ratings Contact Arrangement: 1 NO + 2 NC multi change-over contacts (S/R type) Continuous Thermal Current per Contact: 5 A AC Breaking Capacity (AC-15): 250 VAC, 5 A resistive / inductive load, max 1250 VA DC Breaking Capacity (DC-13, L/R=0.04s): 110 VDC, 3 A inductive load, max 330 W Momentary Make & Carry Capacity (0.2s): 30 A peak Contact Material: Silver alloy anti-welding contacts Mechanical Service Life: ≥10,000,000 cycles unloaded Electrical Service Life: ≥100,000 cycles under full rated breaking load Indication & Mechanical Features Mechanical trip flag indicator: Latched visual fault flag, manual reset pushbutton Transparent lockable front cover to prevent unauthorized setting modification Calibration dial for continuous undervoltage threshold adjustment Terminal layout: Screw-clamp rear terminal block for supply voltage and trip circuit wiring Mechanical & Installation Mounting Method: Standard flush panel mounting (cutout dimension for cabinet panel) Enclosure: Sealed transparent polycarbonate dustproof housing Overall Dimension: H 182 mm × W 146 mm × D 215 mm Net Unit Weight: ~4.4 kg Environmental & Compliance Standards Operating Ambient Temperature: -20 ℃ ~ +70 ℃ Storage & Transport Temperature: -40 ℃ ~ +85 ℃ Relative Humidity: 5% ~ 95% non-condensing Vibration & Shock Test: IEC 60255-21-1 substation anti-vibration standard EMC Immunity: IEC 61000-6-2 industrial electromagnetic compatibility Compliance Standards: IEC 60255-3 measuring relays and protection devices Certifications: CE marked, RoHS & REACH hazardous substance compliant