• Siemens SIRIUS 3SK1 Input Expansions (3SK1220, 3SK1230)
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Siemens SIRIUS 3SK1 Input Expansions (3SK1220, 3SK1230)

Siemens SIRIUS 3SK1 Input Expansions (3SK1220, 3SK1230)

SIRIUS 3SK1220 sensor expansions and 3SK1230 power supplies that make 3SK1 Advanced basic unit systems more flexible.

Key features

  • 3SK1220 adds one 2-channel or two 1-channel sensors (floating or non-floating)
  • Connected to 3SK1 Advanced basic units via 3ZY12 device connectors
  • 3SK1230 supplies 3SK1 Advanced systems at 110-240 V AC/DC
  • 3SK1230 can also be wired as power supply for 3SK1 devices
  • Parameters as for 3SK1 Advanced basic units
  • Screw or spring-loaded (push-in) terminals

Specifications

Brand Siemens
Product line SIRIUS 3SK1 expansion units
For use with 3SK1 Advanced basic units
Ambient temperature -25 ... +60 °C
Degree of protection IP20
Mounting 35 mm DIN rail
Source Siemens Catalog IC 10 · 2026, p. 1061
3SK1220-1AB40 Type: 3SK1220 sensor expansion | Function: 1x 2-ch. or 2x 1-ch. sensor | Supply: 24 V DC | Connection: Screw
3SK1220-2AB40 Type: 3SK1220 sensor expansion | Function: 1x 2-ch. or 2x 1-ch. sensor | Supply: 24 V DC | Connection: Spring-loaded (push-in)
3SK1230-1AW20 Type: 3SK1230 power supply | Function: Supply 3SK1 via device connectors | Supply: 110-240 V AC/DC | Connection: Screw
3SK1230-2AW20 Type: 3SK1230 power supply | Function: Supply 3SK1 via device connectors | Supply: 110-240 V AC/DC | Connection: Spring-loaded (push-in)
Safety RelaysSiemens
4 product codes available in this family
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Siemens SIRIUS 3SK1 Input Expansions (3SK1220, 3SK1230)

Brand Siemens·Safety Relays

Available part numbers (4)

3SK1220-1AB40, 3SK1220-2AB40, 3SK1230-1AW20, 3SK1230-2AW20

How to order

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Product codes & specifications
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Product codeSpec
3SK1220-1AB40Type: 3SK1220 sensor expansion | Function: 1x 2-ch. or 2x 1-ch. sensor | Supply: 24 V DC | Connection: Screw
3SK1220-2AB40Type: 3SK1220 sensor expansion | Function: 1x 2-ch. or 2x 1-ch. sensor | Supply: 24 V DC | Connection: Spring-loaded (push-in)
3SK1230-1AW20Type: 3SK1230 power supply | Function: Supply 3SK1 via device connectors | Supply: 110-240 V AC/DC | Connection: Screw
3SK1230-2AW20Type: 3SK1230 power supply | Function: Supply 3SK1 via device connectors | Supply: 110-240 V AC/DC | Connection: Spring-loaded (push-in)

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