The Citel 821130223 corresponds to the DAC50VGS-20-320, a Type 2+3 surge protection device (SPD) designed for single-phase AC power systems. Here's a detailed breakdown of its specifications and features:

      Electrical Characteristics

• 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
• Max Operating Voltage (Uc): 320 Vac
• Temporary Overvoltage (TOV):
  • 5 sec withstand: 335 Vac
  • 120 min withstand: 440 Vac
• Protection Level (Up):
  • @ In (8/20 ): 1.5 kV (L/PE and N/PE)
  • @ 5 kA (8/20 ): 0.9 kV