{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4027-1BB15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4027-1BB15","canonicalUrl":"https://aoctrl.com/siemens/3RW4027-1BB15","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4027-1BB15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4027-1BB15 soft starter, size S0, 32 A at 40 °C, 600 V insulation voltage, integrated bypass, screw and snap-on mounting, 45 mm width.","salesMarkdown":"## Rated current and thermal derating — the real ceiling for motor starting The 3RW4027-1BB15: For a continuous-duty motor start application, the actual load current must stay below the derated value at the enclosure ambient — if the panel runs at 50 °C, budget 29 A max, not the 40 °C headline. Minimum load is 20 % of the rated current — below that the soft starter may not reliably detect the motor. Don't oversize the unit for a lightly loaded motor; match the frame to the motor FLA within the 20–100 % window. ## Integrated bypass — one less contactor to wire The integrated bypass contact system eliminates the external bypass contactor and its control wiring. That saves a DIN slot and reduces the bill of materials — the soft starter handles the start ramp, then the internal bypass shorts the thyristors for run mode, dropping heat dissipation. Size S0 frame (45 mm wide, 125 mm high, 155 mm deep) mounts on standard 35 mm DIN rail or screws directly to the panel backplate. The screw-and-snap-on fastening lets you pre-wire the panel and snap the unit in last. ## Control voltage and field wiring — global panel fit Control supply accepts 110–230 V DC, covering the common DC bus voltages in industrial panels. Insulation voltage is 600 V, pollution degree 3 per IEC 60947-4-2 — no derating needed in dusty industrial environments. Operating temperature range -25 to +60 °C covers most indoor panels without forced cooling.","metaTitle":"Siemens 3RW4027-1BB15 SIRIUS Soft Starter, 32 A, 600 V","metaDescription":"Siemens 3RW4027-1BB15 SIRIUS soft starter, 32 A at 40°C, integrated bypass, adjustable current limit, 600 V insulation, active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"155mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"45mm","title":"3RW4027-1BB15","Height":"125mm","Upwards":"60mm","Downwards":"40mm","Thyristors":"Yes","At The Side":"15mm","description":"SIRIUS soft starter S0 32 A, 18.5 k kW/500 V, 40 °C 400-600 V AC, 110-230 V AC/DC Screw terminals","During Storage":"-40 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw and snap-on mounting","Minimum Load [%]":"20%","Mounting Position":"With additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"300m","Derating Temperature":"40°C","Inside-Delta Circuit":"No","at 40 °C rated value":"32A","at 50 °C rated value":"29A","at 60 °C rated value":"26A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"screw-type terminals","Motor Overload Protection":"Yes","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S0","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"1x 8, 2x (16 ... 10)","control supply voltage 1 at DC":"110 ... 230V","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"red","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"No","during storage according to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","reference code according to EN 61346-2":"Q","control supply voltage 1 at AC at 50 Hz":"110 ... 230V","control supply voltage 1 at AC at 60 Hz":"110 ... 230V","during operation according to IEC 60721":"3K6 (no formation of ice, no condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6","during transport according to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Evaluation Of Thermistor Motor Protection":"No","at standard circuit at 40 °C rated value":"18.5kW","at standard circuit at 50 °C rated value":"25hp","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"AC/DC","Control Supply Voltage Frequency 1 Rated Value":"50Hz","Control Supply Voltage Frequency 2 Rated Value":"60Hz","Installation Altitude At Height Above Sea Level":"5 000m","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"400 ... 600V","contact rating of auxiliary contacts according to UL":"B300 / R300","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","relative negative tolerance of the control supply voltage at DC":"-15%","relative positive tolerance of the control supply voltage at DC":"10%","Relative Negative Tolerance Of The Control Supply Voltage Frequency":"-10%","Relative Positive Tolerance Of The Control Supply Voltage Frequency":"10%","Relative Negative Tolerance Of The Operating Voltage At Standard Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Standard Circuit":"10%","power loss [W] at operational current at 40 °C during operation typical":"13W","relative negative tolerance of the control supply voltage at AC at 50 Hz":"-15%","relative negative tolerance of the control supply voltage at AC at 60 Hz":"-15%","relative positive tolerance of the control supply voltage at AC at 50 Hz":"10%","relative positive tolerance of the control supply voltage at AC at 60 Hz":"10%","Adjustable Motor Current For Motor Overload Protection Minimum Rated Value":"17A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ecfd25e9c2b35795795de38f1fc94457.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=269530&mlfb=3RW4027-1BB15"},"ai":{"faq":[{"question":"What is 3RW4027-1BB15's listed depth?","answer":"The depth is 155 mm. Combined with the 45 mm width and 125 mm height, the S0 frame fits a standard 45 mm-wide DIN slot with 155 mm of enclosure depth required behind the panel door."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4027-1BB15","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RW4027-1BB15 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}