Siemens SIRIUS 3RW40 soft starters (Basic Performance), S0: normal starting (Class 10), with integrated motor overload protection and bypass contacts. Reduces starting current and mechanical stress of three-phase induction motors; up to 18.5 kW at 400 V.
Technical data
| Series | 3RW40 (Basic Performance) |
|---|---|
| Size | S0 |
| Rated current Ie (40 °C) | 12.5–38 A |
| Motor rating (400 V) | up to 18.5 kW |
| Line voltage | 200–480 V, 400–600 V |
| Control supply voltage | 110–230 V AC/DC, 24 V AC/DC |
| Circuit | Standard (inline) circuit |
| Standard | IEC 60947-4-2 |
Article numbers
| Ie 40 °C (A) | 230 V (kW) | 400 V (kW) | 500 V (kW) | Ie 50 °C (A) | Version | Screw terminals | Spring-loaded terminals |
|---|---|---|---|---|---|---|---|
| 12.5 | 3 | 5.5 | – | 11 | Line 200–480 V, control 24 V AC/DC | 3RW4024-1BB04 | 3RW4024-2BB04 |
| 25 | 5.5 | 11 | – | 23 | Line 200–480 V, control 24 V AC/DC | 3RW4026-1BB04 | 3RW4026-2BB04 |
| 32 | 7.5 | 15 | – | 29 | Line 200–480 V, control 24 V AC/DC | 3RW4027-1BB04 | 3RW4027-2BB04 |
| 38 | 11 | 18.5 | – | 34 | Line 200–480 V, control 24 V AC/DC | 3RW4028-1BB04 | 3RW4028-2BB04 |
| 12.5 | 3 | 5.5 | – | 11 | Line 200–480 V, control 110–230 V AC/DC | 3RW4024-1BB14 | 3RW4024-2BB14 |
| 25 | 5.5 | 11 | – | 23 | Line 200–480 V, control 110–230 V AC/DC | 3RW4026-1BB14 | 3RW4026-2BB14 |
| 32 | 7.5 | 15 | – | 29 | Line 200–480 V, control 110–230 V AC/DC | 3RW4027-1BB14 | 3RW4027-2BB14 |
| 38 | 11 | 18.5 | – | 34 | Line 200–480 V, control 110–230 V AC/DC | 3RW4028-1BB14 | 3RW4028-2BB14 |
| 12.5 | 3 | 5.5 | – | 11 | Line 200–480 V, control 24 V AC/DC, Thermistor motor protection | 3RW4024-1TB04 | 3RW4024-2TB04 |
| 25 | 5.5 | 11 | – | 23 | Line 200–480 V, control 24 V AC/DC, Thermistor motor protection | 3RW4026-1TB04 | 3RW4026-2TB04 |
| 32 | 7.5 | 15 | – | 29 | Line 200–480 V, control 24 V AC/DC, Thermistor motor protection | 3RW4027-1TB04 | 3RW4027-2TB04 |
| 38 | 11 | 18.5 | – | 34 | Line 200–480 V, control 24 V AC/DC, Thermistor motor protection | 3RW4028-1TB04 | 3RW4028-2TB04 |
| 12.5 | – | 5.5 | 7.5 | 11 | Line 400–600 V, control 24 V AC/DC | 3RW4024-1BB05 | 3RW4024-2BB05 |
| 25 | – | 11 | 15 | 23 | Line 400–600 V, control 24 V AC/DC | 3RW4026-1BB05 | 3RW4026-2BB05 |
| 32 | – | 15 | 18.5 | 29 | Line 400–600 V, control 24 V AC/DC | 3RW4027-1BB05 | 3RW4027-2BB05 |
| 38 | – | 18.5 | 22 | 34 | Line 400–600 V, control 24 V AC/DC | 3RW4028-1BB05 | 3RW4028-2BB05 |
| 12.5 | – | 5.5 | 7.5 | 11 | Line 400–600 V, control 110–230 V AC/DC | 3RW4024-1BB15 | 3RW4024-2BB15 |
| 25 | – | 11 | 15 | 23 | Line 400–600 V, control 110–230 V AC/DC | 3RW4026-1BB15 | 3RW4026-2BB15 |
| 32 | – | 15 | 18.5 | 29 | Line 400–600 V, control 110–230 V AC/DC | 3RW4027-1BB15 | 3RW4027-2BB15 |
| 38 | – | 18.5 | 22 | 34 | Line 400–600 V, control 110–230 V AC/DC | 3RW4028-1BB15 | 3RW4028-2BB15 |
| 12.5 | – | 5.5 | 7.5 | 11 | Line 400–600 V, control 24 V AC/DC, Thermistor motor protection | 3RW4024-1TB05 | 3RW4024-2TB05 |
| 25 | – | 11 | 15 | 23 | Line 400–600 V, control 24 V AC/DC, Thermistor motor protection | 3RW4026-1TB05 | 3RW4026-2TB05 |
| 32 | – | 15 | 18.5 | 29 | Line 400–600 V, control 24 V AC/DC, Thermistor motor protection | 3RW4027-1TB05 | 3RW4027-2TB05 |
| 38 | – | 18.5 | 22 | 34 | Line 400–600 V, control 24 V AC/DC, Thermistor motor protection | 3RW4028-1TB05 | 3RW4028-2TB05 |
Motor ratings refer to standard 4-pole motors and normal starting conditions; for heavy starting select the next larger size. On larger sizes spring-loaded terminals apply to the control circuit only, main conductors are connected via busbars. Contact us for selection support.
Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 6, soft starters) and are for information only. Image is representative.
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