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Approvals & Standards

  • EN 61643-21*UL 497B

Key features & benefits

STS 485 is the series of surge protection devices for equipment connected to RS485 networks. The ranges offer a number of formats, voltages and numbers of protected lines and are designed especially for a variety of applications. 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*Commercial and residential installations*Telecom & IT & Data Centers*Photovoltaic & wind*Smart grid & LV Metering

Product Specifications

Item Number


Catalog number


Item Description (ERP)



SPD for analog signals DIN rail format, 4 protected wires, 5 V, 10 kA.  

EAN/UPC code


ROHS Compliant


Nominal Operating Volt Rating (Un)

5   V

Nominal Discharge Current (In) (8/20)


Max Discharge Current : Imax (8/20)


Rated Current Load (IL)

0.45   A


60   MHz

Torque Rating

0.7   N m

Housing Material

PC+GF; V-0  

MOV Response Time

1   ns

Number of Wires

2 Pairs + GND  


5.2   V

Up at In (L-N)

≤ 30   kV

Up at In (L-L)

≤ 10   kV

Product Weight

0.085   kg

Product Width

36   mm

Product Length

64   mm

Product Height

90   mm

Sell Pack Quantity

1   Each

Sell Pack Weight

0.102   kg

Sell Pack Width

25   mm

Sell Pack Length

80   mm

Sell Pack Height

106   mm