• Siemens SIRIUS 3SK1 Output Expansions (3SK1211, 3SK1213)
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Siemens SIRIUS 3SK1 Output Expansions (3SK1211, 3SK1213)

Siemens SIRIUS 3SK1 Output Expansions (3SK1211, 3SK1213)

SIRIUS 3SK121 output expansions that add safe relay outputs to any 3SK basic unit by wiring or 3ZY12 device connectors.

Key features

  • Up to SIL 3 / PL e
  • 3SK1211: four additional safe outputs, AC-15 5 A at 230 V
  • 3SK1213: three safe outputs with high switching capacity, AC-15 10 A at 230 V
  • 24 V DC versions connectable to 3SK1 Advanced and 3SK2 via 3ZY12 device connectors
  • Instantaneous NO enabling contacts plus NC contact for feedback circuit
  • Screw or spring-loaded (push-in) terminals

Specifications

Brand Siemens
Product line SIRIUS 3SK1 expansion units
Output type Relay, instantaneous switching
Ambient temperature -25 ... +60 °C
Degree of protection IP20
Safety level SIL 3 / PL e
Mounting 35 mm DIN rail
Source Siemens Catalog IC 10 · 2026, p. 1059-1060
3SK1211-1BB00 Type: 3SK1211 | Supply: 24 V AC 50/60 Hz | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1211-2BB00 Type: 3SK1211 | Supply: 24 V AC 50/60 Hz | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1211-1BB40 Type: 3SK1211 | Supply: 24 V DC | Outputs: 4 NO + 1 NC feedback | Device connector: Yes | Connection: Screw
3SK1211-2BB40 Type: 3SK1211 | Supply: 24 V DC | Outputs: 4 NO + 1 NC feedback | Device connector: Yes | Connection: Spring-loaded (push-in)
3SK1211-1BW20 Type: 3SK1211 | Supply: 110-240 V AC/DC | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1211-2BW20 Type: 3SK1211 | Supply: 110-240 V AC/DC | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1213-1AB40 Type: 3SK1213 | Supply: 24 V DC | Outputs: 3 NO + 1 NC feedback | Device connector: Yes | Connection: Screw
3SK1213-2AB40 Type: 3SK1213 | Supply: 24 V DC | Outputs: 3 NO + 1 NC feedback | Device connector: Yes | Connection: Spring-loaded (push-in)
3SK1213-1AJ20 Type: 3SK1213 | Supply: 115 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1213-2AJ20 Type: 3SK1213 | Supply: 115 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1213-1AL20 Type: 3SK1213 | Supply: 230 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1213-2AL20 Type: 3SK1213 | Supply: 230 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
Safety RelaysSiemens
12 product codes available in this family
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Siemens SIRIUS 3SK1 Output Expansions (3SK1211, 3SK1213)

Brand Siemens·Safety Relays

Available part numbers (12)

3SK1211-1BB00, 3SK1211-2BB00, 3SK1211-1BB40, 3SK1211-2BB40, 3SK1211-1BW20, 3SK1211-2BW20, 3SK1213-1AB40, 3SK1213-2AB40, 3SK1213-1AJ20, 3SK1213-2AJ20 + 2 more — see full table ↓

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Product codes & specifications
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Product codeSpec
3SK1211-1BB00Type: 3SK1211 | Supply: 24 V AC 50/60 Hz | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1211-2BB00Type: 3SK1211 | Supply: 24 V AC 50/60 Hz | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1211-1BB40Type: 3SK1211 | Supply: 24 V DC | Outputs: 4 NO + 1 NC feedback | Device connector: Yes | Connection: Screw
3SK1211-2BB40Type: 3SK1211 | Supply: 24 V DC | Outputs: 4 NO + 1 NC feedback | Device connector: Yes | Connection: Spring-loaded (push-in)
3SK1211-1BW20Type: 3SK1211 | Supply: 110-240 V AC/DC | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1211-2BW20Type: 3SK1211 | Supply: 110-240 V AC/DC | Outputs: 4 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1213-1AB40Type: 3SK1213 | Supply: 24 V DC | Outputs: 3 NO + 1 NC feedback | Device connector: Yes | Connection: Screw
3SK1213-2AB40Type: 3SK1213 | Supply: 24 V DC | Outputs: 3 NO + 1 NC feedback | Device connector: Yes | Connection: Spring-loaded (push-in)
3SK1213-1AJ20Type: 3SK1213 | Supply: 115 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1213-2AJ20Type: 3SK1213 | Supply: 115 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)
3SK1213-1AL20Type: 3SK1213 | Supply: 230 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Screw
3SK1213-2AL20Type: 3SK1213 | Supply: 230 V AC 50/60 Hz | Outputs: 3 NO + 1 NC feedback | Device connector: No | Connection: Spring-loaded (push-in)

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