The Citel 821130222 corresponds to the DAC50VGS-20-275, a Type 2+3 AC surge protection device designed for single-phase systems. Here's a detailed breakdown of its specifications and features:

Electrical Specifications

• SPD Type: Type 2 + 3 (IEC 61643-11)
• Nominal Discharge Current (In): 20 kA (8/20 )
• Maximum Discharge Current (Imax): 50 kA per pole; 100 kA total
• Voltage Rating (Uc): 275 Vac
• Temporary Overvoltage (TOV):
  • 5 sec: withstands 335 Vac
  • 120 min: withstands 440 Vac
• Protection Level (Up):
  • L/PE and N/PE @ In: 1.5 kV
  • L/PE and N/PE @ 5 kA: 0.7 kV
• Short-Circuit Current Rating (Isccr): 50,000 A