Siemens 3RA1145-4KD45-1AU6
MPN3RA1145-4KD45-1AU6
Combination starter Nonreversing Fastbus mount,IEC SIRIUS Frame size S3,57 - 75a 277 VAC control voltage MSP aux-1 SPDT NO/NC Contactor auxiliary -1NO Front mount
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Product designation | non-fused motor starter |
| Main circuit poles | 3 |
| Brand | SIRIUS |
| Load feeder size | S3 |
| Product design / construction | direct starter |
| Circuit-breaker size | S3 |
| Included contactor (type) | 3RT1045-1AU60 |
| Included circuit-breaker (type) | 3RV1041-4KA15 |
| Included link module (type) | 3RA1941-1AA00 |
| Parameter | Value |
|---|---|
| Rated motor power at 400 V | 37 000 W |
| Operational current Ie, AC-3 at 400 V | 66 A |
| Rated voltage at AC-3, max. | 690 V |
| Rated motor power at 460/480 V (hp) | 60 hp |
| Rated motor power at 575/600 V (hp) | 75 hp |
| Rated current at 480 V | 75 A |
| Rated current at 600 V | 75 A |
| Rated operating frequency | 60 ... 60 Hz |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Rated insulation voltage Ui (AC, pollution degree 3) | 690 V |
| Mechanical service life, typ. (switching cycles) | 10 000 000 |
| Parameter | Value |
|---|---|
| Trip class | CLASS 10 |
| Short-circuit protection | Yes |
| Rated short-circuit current at 400 V (IEC 60947-4-1) | 50 000 A |
| Overload release setting range (current) | 57 ... 75 A |
| Overload release type | thermal (bimetallic) |
| Short-circuit trip type | magnetic |
| Duty / utilization type (IEC 60947-6-2) | 2 |
| Parameter | Value |
|---|---|
| Rated value | 690 V |
| Rated voltage range at 50 Hz | 221.6 ... 304.7 V |
| Auxiliary contacts, NO | 1 |
| Auxiliary contacts, NC | 1 |
| Auxiliary switch extension | Yes |
| Switching contact type | electromechanical |
| Parameter | Value |
|---|---|
| Main circuit connection type | screw-type terminals |
| Main contact conductor range (AWG) | 1x (10 ... 2/0), 2x (10 ... 1/0) |
| Mounting / fastening method | for snapping onto 60 mm busbar systems |
| Mounting position | vertical |
| Width | 70 mm |
| Height | 354 mm |
| Depth | 244 mm |
| Parameter | Value |
|---|---|
| Operating temperature range | -20 ... +60 °C |
| Storage temperature range | -50 ... +80 °C |
| Transport temperature range | -55 ... +80 °C |
| Pollution degree | 3 |
| Shock resistance (IEC 60068-2-27) | 6g / 11 ms |
MPN
3RA1145-4KD45-1AU6