Siemens SIRIUS 3RW55 Failsafe soft starters (High Performance), Frame size 2: with failsafe (safe stop) function, normal starting (Class 10E), torque control and communication module slot. Reduces starting current and mechanical stress of three-phase induction motors; up to 45 kW at 400 V.
Technical data
| Series | 3RW55 Failsafe (High Performance) |
|---|---|
| Size | Frame size 2 |
| Rated current Ie (40 °C) | 47–93 A |
| Motor rating (400 V) | up to 45 kW |
| Line voltage | 200–480 V |
| Control supply voltage | 110–250 V AC, 24 V AC/DC |
| Circuit | Standard (inline) circuit; inside-delta circuit also possible |
| 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 |
|---|---|---|---|---|---|---|---|
| 47 | 11 | 22 | – | 41.6 | Line 200–480 V, control 24 V AC/DC | 3RW5524-1HF04 | 3RW5524-3HF04 |
| 63 | 18.5 | 30 | – | 55.5 | Line 200–480 V, control 24 V AC/DC | 3RW5525-1HF04 | 3RW5525-3HF04 |
| 77 | 22 | 37 | – | 68 | Line 200–480 V, control 24 V AC/DC | 3RW5526-1HF04 | 3RW5526-3HF04 |
| 93 | 22 | 45 | – | 82.5 | Line 200–480 V, control 24 V AC/DC | 3RW5527-1HF04 | 3RW5527-3HF04 |
| 47 | 11 | 22 | – | 41.6 | Line 200–480 V, control 110–250 V AC | 3RW5524-1HF14 | 3RW5524-3HF14 |
| 63 | 18.5 | 30 | – | 55.5 | Line 200–480 V, control 110–250 V AC | 3RW5525-1HF14 | 3RW5525-3HF14 |
| 77 | 22 | 37 | – | 68 | Line 200–480 V, control 110–250 V AC | 3RW5526-1HF14 | 3RW5526-3HF14 |
| 93 | 22 | 45 | – | 82.5 | Line 200–480 V, control 110–250 V AC | 3RW5527-1HF14 | 3RW5527-3HF14 |
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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