• Siemens SIRIUS 3RT20 Railway Contactors, Extended Range (S00-S3)
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Siemens SIRIUS 3RT20 Railway Contactors, Extended Range (S00-S3)

Siemens SIRIUS 3RT20 Railway Contactors, Extended Range (S00-S3)

SIRIUS 3RT20 3-pole contactors with extended DC operating range (0.7 to 1.25 x Uc) and railway approval to IEC 60077-2/EN 50155, for motor loads up to 110 A / 55 kW at 400 V.

Key features

  • Approved to IEC 60947-4-1, IEC 60077-2 and EN 50155 for railway applications
  • Extended coil operating range 0.7 ... 1.25 x Uc, -40 to +70 °C
  • Coupling, series-resistor and solid-state DC operating mechanism versions
  • Integrated surge suppression (suppressor diode or varistor)
  • Spring-loaded terminals for vibration resistance (S2/S3: auxiliary and control circuits)
  • AC-3/AC-3e ratings from 12 A (S00) to 110 A (S3) at 400 V

Specifications

Brand Siemens SIRIUS
Series 3RT20
Poles 3
Standards IEC 60947-4-1, IEC 60077-2, EN 50155
Operation DC
Terminals Spring-loaded
Mounting TH 35 DIN rail or screw fixing
Source Siemens Catalog IC 10 · 2026, p. 4/57-4/59
3RT2017-2KF41 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, suppressor diode | Aux. contacts: 1 NO | Coil: 110 V DC
3RT2017-2KF42 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, suppressor diode | Aux. contacts: 1 NC | Coil: 110 V DC
3RT2017-2LB41 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO | Coil: 24 V DC
3RT2017-2LF41 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO | Coil: 110 V DC
3RT2017-2LB42 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NC | Coil: 24 V DC
3RT2017-2LF42 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NC | Coil: 110 V DC
3RT2017-2KB42-0LA0 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2017-2KF42-0LA0 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2018-2KB42-0LA0 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2018-2KF42-0LA0 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2017-2LB42-0LA0 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2017-2LF42-0LA0 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2018-2LB42-0LA0 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2018-2LF42-0LA0 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2017-2XB41-0LA2 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 24...34 V DC
3RT2017-2XF41-0LA2 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 72...125 V DC
3RT2017-2XB42-0LA2 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 24...34 V DC
3RT2017-2XF42-0LA2 Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 72...125 V DC
3RT2018-2XB41-0LA2 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 24...34 V DC
3RT2018-2XF41-0LA2 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 72...125 V DC
3RT2018-2XB42-0LA2 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 24...34 V DC
3RT2018-2XF42-0LA2 Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 72...125 V DC
3RT2025-2KF40 Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2026-2KF40 Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2027-2KF40 Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2025-2XB40-0LA2 Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2025-2XF40-0LA2 Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2026-2XB40-0LA2 Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2026-2XF40-0LA2 Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2027-2XB40-0LA2 Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2027-2XF40-0LA2 Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2028-2XB40-0LA2 Size: S0 | AC-3 (400 V): 38 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2028-2XF40-0LA2 Size: S0 | AC-3 (400 V): 38 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2035-3XB40-0LA2 Size: S2 | AC-3 (400 V): 40 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2035-3XF40-0LA2 Size: S2 | AC-3 (400 V): 40 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2036-3XB40-0LA2 Size: S2 | AC-3 (400 V): 50 A / 22 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2036-3XF40-0LA2 Size: S2 | AC-3 (400 V): 50 A / 22 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2037-3XB40-0LA2 Size: S2 | AC-3 (400 V): 65 A / 30 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2037-3XF40-0LA2 Size: S2 | AC-3 (400 V): 65 A / 30 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2038-3XB40-0LA2 Size: S2 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2038-3XF40-0LA2 Size: S2 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2045-3XB40-0LA2 Size: S3 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2045-3XF40-0LA2 Size: S3 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2046-3XB40-0LA2 Size: S3 | AC-3 (400 V): 95 A / 45 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2046-3XF40-0LA2 Size: S3 | AC-3 (400 V): 95 A / 45 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2047-3XB40-0LA2 Size: S3 | AC-3 (400 V): 110 A / 55 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2047-3XF40-0LA2 Size: S3 | AC-3 (400 V): 110 A / 55 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
Magnetic ContactorsSiemens
47 product codes available in this family
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Siemens SIRIUS 3RT20 Railway Contactors, Extended Range (S00-S3)

Brand Siemens·Magnetic Contactors

Available part numbers (47)

3RT2017-2KF41, 3RT2017-2KF42, 3RT2017-2LB41, 3RT2017-2LF41, 3RT2017-2LB42, 3RT2017-2LF42, 3RT2017-2KB42-0LA0, 3RT2017-2KF42-0LA0, 3RT2018-2KB42-0LA0, 3RT2018-2KF42-0LA0 + 37 more — see full table ↓

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Product codeSpec
3RT2017-2KF41Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, suppressor diode | Aux. contacts: 1 NO | Coil: 110 V DC
3RT2017-2KF42Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, suppressor diode | Aux. contacts: 1 NC | Coil: 110 V DC
3RT2017-2LB41Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO | Coil: 24 V DC
3RT2017-2LF41Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO | Coil: 110 V DC
3RT2017-2LB42Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NC | Coil: 24 V DC
3RT2017-2LF42Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NC | Coil: 110 V DC
3RT2017-2KB42-0LA0Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2017-2KF42-0LA0Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2018-2KB42-0LA0Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2018-2KF42-0LA0Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, suppressor diode | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2017-2LB42-0LA0Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2017-2LF42-0LA0Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2018-2LB42-0LA0Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 24 V DC
3RT2018-2LF42-0LA0Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Series resistor, varistor | Aux. contacts: 1 NC (used for resistor) | Coil: 110 V DC
3RT2017-2XB41-0LA2Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 24...34 V DC
3RT2017-2XF41-0LA2Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 72...125 V DC
3RT2017-2XB42-0LA2Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 24...34 V DC
3RT2017-2XF42-0LA2Size: S00 | AC-3 (400 V): 12 A / 5.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 72...125 V DC
3RT2018-2XB41-0LA2Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 24...34 V DC
3RT2018-2XF41-0LA2Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO | Coil: 72...125 V DC
3RT2018-2XB42-0LA2Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 24...34 V DC
3RT2018-2XF42-0LA2Size: S00 | AC-3 (400 V): 16 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NC | Coil: 72...125 V DC
3RT2025-2KF40Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2026-2KF40Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2027-2KF40Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Coupling, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2025-2XB40-0LA2Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2025-2XF40-0LA2Size: S0 | AC-3 (400 V): 17 A / 7.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2026-2XB40-0LA2Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2026-2XF40-0LA2Size: S0 | AC-3 (400 V): 25 A / 11 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2027-2XB40-0LA2Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2027-2XF40-0LA2Size: S0 | AC-3 (400 V): 32 A / 15 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2028-2XB40-0LA2Size: S0 | AC-3 (400 V): 38 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2028-2XF40-0LA2Size: S0 | AC-3 (400 V): 38 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2035-3XB40-0LA2Size: S2 | AC-3 (400 V): 40 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2035-3XF40-0LA2Size: S2 | AC-3 (400 V): 40 A / 18.5 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2036-3XB40-0LA2Size: S2 | AC-3 (400 V): 50 A / 22 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2036-3XF40-0LA2Size: S2 | AC-3 (400 V): 50 A / 22 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2037-3XB40-0LA2Size: S2 | AC-3 (400 V): 65 A / 30 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2037-3XF40-0LA2Size: S2 | AC-3 (400 V): 65 A / 30 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2038-3XB40-0LA2Size: S2 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2038-3XF40-0LA2Size: S2 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2045-3XB40-0LA2Size: S3 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2045-3XF40-0LA2Size: S3 | AC-3 (400 V): 80 A / 37 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2046-3XB40-0LA2Size: S3 | AC-3 (400 V): 95 A / 45 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2046-3XF40-0LA2Size: S3 | AC-3 (400 V): 95 A / 45 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC
3RT2047-3XB40-0LA2Size: S3 | AC-3 (400 V): 110 A / 55 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 24 V DC
3RT2047-3XF40-0LA2Size: S3 | AC-3 (400 V): 110 A / 55 kW | Version: Solid-state, varistor | Aux. contacts: 1 NO + 1 NC | Coil: 110 V DC

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