• Siemens SIRIUS 3RT20 Fail-Safe Contactors S2-S3 (18.5-55 kW)
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Siemens SIRIUS 3RT20 Fail-Safe Contactors S2-S3 (18.5-55 kW)

Siemens SIRIUS 3RT20 Fail-Safe Contactors S2-S3 (18.5-55 kW)

SIRIUS 3RT20 contactors in sizes S2 and S3 with AC/DC operating mechanism and certified fail-safe 24 V DC digital input for F-PLC or safety relay control.

Key features

  • Certified fail-safe 24 V DC digital input with max. 20 mA
  • SIL 2 / PL c with one contactor, SIL 3 / PL e with two contactors in series (IEC 62061, ISO 13849-1)
  • Extended solenoid coil operating range 0.8 to 1.1 x Uc, power reduced to holding power
  • Ratings 41 to 110 A (18.5 to 55 kW at 400 V), integrated 1 NC
  • Screw terminals or spring-loaded terminals

Specifications

Brand line SIRIUS
Series 3RT20 power contactor
Poles 3 (main contacts)
Utilization AC-3 / AC-3e, IE3/IE4 ready
Aux. contacts 1 NC
Version Fail-safe 24 V DC input
Manufacturer Siemens
Product category Magnetic Contactors
Catalog chapter Contactors for switching motors
Catalog section SIRIUS 3RT contactors, 3-pole up to 250 kW
Source Siemens Catalog IC 10 · 2026, p. 188
3RT2035-1SB30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2035-3SB30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2035-1SF30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2035-3SF30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2035-1SP30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2035-3SP30 Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2036-1SB30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2036-3SB30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2036-1SF30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2036-3SF30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2036-1SP30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2036-3SP30 Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2037-1SB30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2037-3SB30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2037-1SF30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2037-3SF30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2037-1SP30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2037-3SP30 Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2038-1SB30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2038-3SB30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2038-1SF30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2038-3SF30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2038-1SP30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2038-3SP30 Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2045-1SB30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2045-3SB30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2045-1SF30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2045-3SF30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2045-1SP30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2045-3SP30 Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2046-1SB30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2046-3SB30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2046-1SF30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2046-3SF30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2046-1SP30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2046-3SP30 Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2047-1SB30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2047-3SB30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2047-1SF30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2047-3SF30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2047-1SP30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2047-3SP30 Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
Magnetic ContactorsSiemens
42 product codes available in this family
Sourced direct from KoreaExport-ready supplyCompetitive pricing
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Siemens SIRIUS 3RT20 Fail-Safe Contactors S2-S3 (18.5-55 kW)

Brand Siemens·Magnetic Contactors

Available part numbers (42)

3RT2035-1SB30, 3RT2035-3SB30, 3RT2035-1SF30, 3RT2035-3SF30, 3RT2035-1SP30, 3RT2035-3SP30, 3RT2036-1SB30, 3RT2036-3SB30, 3RT2036-1SF30, 3RT2036-3SF30 + 32 more — see full table ↓

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Product codes & specifications
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RFQ List (0)
Product codeSpec
3RT2035-1SB30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2035-3SB30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2035-1SF30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2035-3SF30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2035-1SP30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2035-3SP30Type: 3RT2035 (S2) | Rating: AC-3 41 A/18.5 kW; AC-1 60 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2036-1SB30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2036-3SB30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2036-1SF30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2036-3SF30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2036-1SP30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2036-3SP30Type: 3RT2036 (S2) | Rating: AC-3 51 A/22 kW; AC-1 70 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2037-1SB30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2037-3SB30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2037-1SF30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2037-3SF30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2037-1SP30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2037-3SP30Type: 3RT2037 (S2) | Rating: AC-3 65 A/30 kW; AC-1 80 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2038-1SB30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2038-3SB30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2038-1SF30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2038-3SF30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2038-1SP30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2038-3SP30Type: 3RT2038 (S2) | Rating: AC-3 80 A/37 kW; AC-1 90 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2045-1SB30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2045-3SB30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2045-1SF30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2045-3SF30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2045-1SP30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2045-3SP30Type: 3RT2045 (S3) | Rating: AC-3 80 A/37 kW; AC-1 125 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2046-1SB30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2046-3SB30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2046-1SF30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2046-3SF30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2046-1SP30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2046-3SP30Type: 3RT2046 (S3) | Rating: AC-3 95 A/45 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded
3RT2047-1SB30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Screw
3RT2047-3SB30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 21-33 V AC/DC | Connection: Spring-loaded
3RT2047-1SF30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Screw
3RT2047-3SF30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 83-150 V AC/DC | Connection: Spring-loaded
3RT2047-1SP30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Screw
3RT2047-3SP30Type: 3RT2047 (S3) | Rating: AC-3 110 A/55 kW; AC-1 130 A | Coil: 175-280 V AC/DC | Connection: Spring-loaded

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