• Siemens SIRIUS 3SK2 Safety Relays (Basic Units, PROFINET, Kits)
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Siemens SIRIUS 3SK2 Safety Relays (Basic Units, PROFINET, Kits)

Siemens SIRIUS 3SK2 Safety Relays (Basic Units, PROFINET, Kits)

SIRIUS 3SK2 software-configurable safety relays with many inputs and semiconductor outputs, plus PROFINET interface module and starter kits.

Key features

  • Up to SIL 3 (IEC 62061) and PL e (ISO 13849-1)
  • Configured with SIRIUS Safety ES (TIA Portal); several independent safety functions
  • 22.5 mm version: 10 x 1-channel (5 x 2-channel) inputs; 45 mm version: 20 x 1-channel inputs
  • Semiconductor outputs 4 A at DC-13/24 V; expandable via 3ZY12 device connectors
  • PROFINET interface module 3SK2511 for diagnostics and control-system integration
  • Starter kits with basic unit, software and cables

Specifications

Brand Siemens
Product line SIRIUS 3SK2
Control supply voltage 24 V DC
Ambient temperature -25 ... +60 °C
Degree of protection IP20
Safety level SIL 3 / PL e
Approvals UL, TÜV
Mounting 35 mm DIN rail
Source Siemens Catalog IC 10 · 2026, p. 1054-1058
3SK2112-1AA10 Type: 3SK2112 basic unit | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Screw
3SK2112-2AA10 Type: 3SK2112 basic unit | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2122-1AA10 Type: 3SK2122 basic unit | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm | Connection: Screw
3SK2122-2AA10 Type: 3SK2122 basic unit | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm | Connection: Spring-loaded (push-in)
3SK2511-1FA10 Type: 3SK2511 PROFINET interface module | Inputs: -- | Outputs: -- | Width: 22.5 mm | Connection: Screw
3SK2511-2FA10 Type: 3SK2511 PROFINET interface module | Inputs: -- | Outputs: -- | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2941-2AA11 Type: Basic starter kit (3SK2112-2AA10, cable) | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2942-2AA11 Type: PROFINET starter kit (3SK2122 + 3SK2511) | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm + 22.5 mm | Connection: Spring-loaded (push-in)
Safety RelaysSiemens
8 product codes available in this family
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Siemens SIRIUS 3SK2 Safety Relays (Basic Units, PROFINET, Kits)

Brand Siemens·Safety Relays

Available part numbers (8)

3SK2112-1AA10, 3SK2112-2AA10, 3SK2122-1AA10, 3SK2122-2AA10, 3SK2511-1FA10, 3SK2511-2FA10, 3SK2941-2AA11, 3SK2942-2AA11

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Product codes & specifications
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Product codeSpec
3SK2112-1AA10Type: 3SK2112 basic unit | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Screw
3SK2112-2AA10Type: 3SK2112 basic unit | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2122-1AA10Type: 3SK2122 basic unit | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm | Connection: Screw
3SK2122-2AA10Type: 3SK2122 basic unit | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm | Connection: Spring-loaded (push-in)
3SK2511-1FA10Type: 3SK2511 PROFINET interface module | Inputs: -- | Outputs: -- | Width: 22.5 mm | Connection: Screw
3SK2511-2FA10Type: 3SK2511 PROFINET interface module | Inputs: -- | Outputs: -- | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2941-2AA11Type: Basic starter kit (3SK2112-2AA10, cable) | Inputs: 10 F-DI | Outputs: 2 F-DQ + 1 non-safety | Width: 22.5 mm | Connection: Spring-loaded (push-in)
3SK2942-2AA11Type: PROFINET starter kit (3SK2122 + 3SK2511) | Inputs: 20 F-DI | Outputs: 4 F-DQ + 2 non-safety | Width: 45 mm + 22.5 mm | Connection: Spring-loaded (push-in)

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