Surge Protection for Power Lines

DIN-Rail IEC Type 2+3 / Class II+III

Surge-Trap® Monobloc STET23 Series - 20kA with EMI Filter

STE T23 20 is the series of combined Type 2+3/Class II+III devices for discharging voltage surges while providing a very fine voltage protection level, in accordance with EN/IEC 61643. Complete with a built-in powerful EMI filter. Suitable as the final stage of protection in installations with electromagnetic disturbances which might interrupt, degrade or limit system performance. Series connection for applications up to 20A rated current.



  • Maximum discharge current (8/20μs): 20kA
  • Nominal discharge current (8/20μs): 10kA
  • Combined voltage pulse (1.2/50μs): 6kV
  • Filter attenuation up to 82dB (common mode)
  • Rated current load (IL): 20A
  • Single phase TT and TNS networks
  • Un: 120V, 230V
  • DIN-rail mountable, monobloc format
  • Visual (LED) and remote end of life indicators
  • Power status (LED) indicator
  • Back-up fuse: 20 A gG


  • Mounting DIN-rail
  • Body Material PC+GF
  • Materials Contact Steel
  • Number of Poles 2
  • Standards IEC 61643-11
    EN 61643-11
  • Application Industry and automation
    Commercial and residential installations
    Telecom & IT & Data Centers
    Water treatment
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • STET23-20K150V-SPM - 83230401
  • STET23-20K275V-SPM - 83230403


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