{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW3027-2BB04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW3027-2BB04","canonicalUrl":"https://aoctrl.com/siemens/3RW3027-2BB04","factsUrl":"https://aoctrl.com/api/mcp/products/3RW3027-2BB04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW3027-2BB04 soft starter, 32 A at 40 °C, 600 V insulation voltage, size S0, integrated bypass contact system, spring-loaded terminals for main and control circuits, screw and snap-on mounting.","salesMarkdown":"## What the 32 A rating means on this SIRIUS soft starter The 3RW3027-2BB04: That 40 °C baseline is the typical panel internal temperature; if your enclosure runs hotter, the continuous current ceiling drops — plan the motor FLA against the derated figure at your actual ambient, not the 32 A headline. The integrated bypass contact system means once the motor reaches full speed, the thyristors are shorted out by an internal contactor — no external bypass contactor to wire, and the silicon junctions cool to near-ambient during run. This is the main differentiator from a basic soft starter that leaves the SCRs in circuit and burns heat continuously. ## Panel integration — size S0 and terminal style Size S0 frame measures 150 mm high x 45 mm wide x 150 mm deep. That 45 mm width is a single 9 mm DIN-rail module pitch — it occupies one slot. Screw and snap-on mounting lets you either clip it onto the DIN rail or screw-fix it to a backplate; the snap-on is faster for panel builds. Spring-loaded terminals on both the main current circuit and the auxiliary/control circuit — no screwdriver required for the power wires or the 24 V control loop. The main circuit accepts 16 to 8 AWG; the auxiliary side takes 24 to 14 AWG. Solid conductors and ferruled stranded both lock in without retorquing. Clearance zones: 60 mm above, 40 mm below, 15 mm at the sides. Those are the ventilation gaps — stack them tighter and the thyristor heatsink loses airflow, pulling the derating curve down. The mounting position allows ±10° rotation and ±10° tilt forward/back, so you can angle it in a tight cabinet as long as the natural convection path isn't blocked. ## What it doesn't do — external protection you must add This soft starter has no motor overload protection, no intrinsic device protection, no adjustable current limitation, and no motor brake output. That means you need an external overload relay in the motor circuit, a separate upstream short-circuit protection device (MCCB or fuses), and a standalone brake controller if the application requires DC injection braking. The minimum load is 10 % — it won't start a motor that draws less than 3.2 A at 40 °C. No official successor or cross-reference is listed, so the 3RW3027-2BB04 is the active part for new builds and MRO spares.","metaTitle":"Siemens 3RW3027-2BB04 SIRIUS Soft Starter, 32 A, 600 V","metaDescription":"Siemens 3RW3027-2BB04 SIRIUS soft starter, 32 A at 40 °C, 600 V insulation, integrated bypass, spring terminals. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"150mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45mm","title":"3RW3027-2BB04","Height":"150mm","Upwards":"60mm","Downwards":"40mm","Thyristors":"Yes","At The Side":"15mm","description":"SIRIUS soft starter S0 32 A, 15 kW/400 V, 40 °C 200-480 V AC, 24 V AC/DC spring-type terminals","During Storage":"-40 ... +80°C","External Reset":"No","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw and snap-on mounting","Minimum Load [%]":"10%","For Main Contacts":"16 ... 8","Mounting Position":"With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° tiltable to the front and back","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 50 Hz rated value":"24V","at 60 Hz rated value":"24V","at 40 °C rated value":"32A","at 50 °C rated value":"29A","at 60 °C rated value":"26A","For Auxiliary Contacts":"2x (24 ... 14)","For Main Current Circuit":"spring-loaded terminals","Motor Overload Protection":"No","Intrinsic Device Protection":"No","Adjustable Current Limitation":"No","Size Of Engine Control Device":"S0","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"1x 8, 2x (16 ... 10)","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"red","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"spring-loaded 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","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 (0.25 ... 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":"15kW","at standard circuit at 50 °C rated value":"20hp","control supply voltage 1 at DC rated value":"24V","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"1","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":"200 ... 480V","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%","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%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/194db00ebbdc7f78a53e696fddf5a843.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=419746&mlfb=3RW3027-2BB04"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW3027-2BB04?","answer":"The maximum motor cable length is 300 m. Beyond that, voltage drop and reflected-wave effects on the thyristors become a risk — keep the run under 300 m or add a motor reactor."},{"question":"Does 3RW3027-2BB04 include an integrated bypass contactor?","answer":"Yes, the integrated bypass contact system eliminates the need for an external bypass contactor. Once the motor is up to speed, the thyristors are shorted out, reducing heat dissipation in the enclosure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW3027-2BB04","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/3RW3027-2BB04 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}}