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Approvals & Standards

  • EN 61643-21
  • UL 497B

Key features & benefits

STS PLC is the series of surge protection devices for digital signals and in particular for programmable logic controllers. The range offers a number of voltages and number of protected lines for a variety of applications as well as a terminal block ultra-slim format. These are protectors for a final step of very fine protection to be installed as close as possible to particularly sensitive equipment connected to these communications lines. Meets the IEC 61643-21 standard.

More specifications


  • Industry and automation
  • Telecom & IT & Data Centers
  • Photovoltaic & wind
  • Water treatment

Product Specifications

Item Number


Catalog number



SPD for analog signals terminal block format, 4 protected wires, 24 V, 10 kA.  

EAN/UPC code


ROHS Compliant


Nominal Operating Volt Rating (Un)

24   V

Nominal Discharge Current (In) (8/20)


Max Discharge Current : Imax (8/20)


Rated Current Load (IL)

0.5   A


2   MHz

Housing Material


MOV Response Time

1   ns

Number of Wires

4 Wires  


24   V

Product Weight

0.069   kg

Product Width

7.8   mm

Product Length

99   mm

Product Height

90   mm

Sell Pack Quantity

1   Each

Sell Pack Weight

0.071   kg

Sell Pack Width

45   mm

Sell Pack Length

80   mm

Sell Pack Height

106   mm