Technical Specifications Basic Identification Brand: GEC Alstom / Alstom Grid Full Model Code: MCGG82H1CD0753E Product Series: MCGG82 Multi-element Overcurrent & Earth Fault Relay Product Type: Electromechanical Multi-stage Protection Relay Application: MV feeder, transformer, railway traction substation, industrial power distribution protection Electrical Input & Supply Parameters CT Secondary Rated Input: 5A standard (1A optional) Control Auxiliary Supply Voltage: DC 110V (code D = DC110V coil) Supply Operating Range: 77 ~ 137.5 VDC Coil Power Consumption: ≤12VA at rated voltage Rated Frequency: 50Hz CT Circuit Burden: ≤3VA per phase Protection Setting Ranges Phase Overcurrent (Long Time Delay IDMT) Pickup Current Setting: 0.5 ~ 10 × CT secondary rated current Standard Time Curves: IEC standard inverse, very inverse, extremely inverse, definite time selectable Phase Instantaneous Short-Circuit Instantaneous threshold: 2 ~ 40 × pickup current, adjustable Residual Earth Fault Protection (Two-stage) Earth fault long delay pickup: 0.1 ~ 2 × CT secondary Earth fault instantaneous trip: 2 ~ 20 × earth pickup setting Trip Contact Ratings Continuous carrying current: 5A AC / DC Breaking Capacity AC resistive load: 1250VA (max 300V, 5A) DC inductive load (L/R=0.04s): 50W (max 300V, 5A) Momentary make & carry capacity (0.2s): 7500VA, max 30A Contact Mechanical Life: ≥100,000 cycles (unloaded) Contact Electrical Life: ≥10,000 cycles under rated breaking load Contact Configuration: Multi change-over trip contacts for alarm & circuit breaker tripping Indicator & Operation Features Front panel dual LED status indicators: Delay trip / Instantaneous trip Manual push-button trip reset for fault flag clearing Lockable transparent front cover for parameter setting tamper prevention Mechanical & Installation Mounting Type: Standard flush panel rack mounting (3D vertical enclosure) Overall Dimension: H 185 mm × W 145 mm × D 210 mm Net Weight: 1.35 kg Wiring Terminal: Screw clamp rear terminal block for CT, auxiliary supply and trip circuit wiring Environmental & Compliance Standards Operating Ambient Temperature: -20 ℃ ~ +70 ℃ Storage & Transport Temperature: -40 ℃ ~ +85 ℃ Relative Humidity: 5% ~ 95% non-condensing Vibration & Shock Standard: IEC 60255-21-1 substation equipment anti-vibration EMC Compliance: IEC 61000-6-2 industrial immunity standard Certification & Standards: IEC 60255, CE marked, RoHS compliant