{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4027-2BB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4027-2BB05","canonicalUrl":"https://aoctrl.com/siemens/3RW4027-2BB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4027-2BB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4027-2BB05 soft starter, S0 frame, 32 A at 40 °C, 45 mm width, spring-loaded terminals, integrated bypass contact system.","salesMarkdown":"## 32 A continuous — what it means for the motor The 3RW4027-2BB05: The 32 A rating at 40 °C sets the maximum continuous motor current this soft starter can handle in a standard 40 °C panel ambient. With an integrated bypass contact system, once the motor reaches full speed the thyristors are shorted out, eliminating semiconductor conduction losses during run. This means the 32 A rating is for the start transient only; the bypass carries the continuous load with no additional heat sink burden. ## S0 frame, 45 mm — panel fit and wiring The S0 frame is the compact Siemens soft starter chassis — 45 mm wide, 150 mm high, 155 mm deep. Spring-loaded terminals on both the main current circuit and auxiliary/control circuit mean no screwdriver needed for wiring — strip, push, done. ## Built-in overload and current limit Motor overload protection is integrated — no separate thermal relay needed. The adjustable current limitation lets you set the starting current between 20% and the rated current, reducing mechanical stress on the driven load and voltage drop on the line. External reset allows an automated restart signal from the controller. ## Sourcing and lifecycle — active, quoted to order The S0 frame, 32 A rating, and integrated bypass make it a direct fit for new panel builds or as a replacement for earlier 3RW40 series units.","metaTitle":"Siemens 3RW4027-2BB05 SIRIUS Soft Starter, 32A, S0 Frame","metaDescription":"Siemens 3RW4027-2BB05 SIRIUS soft starter, 32A at 40°C, S0 frame, 45mm wide. Active production, integrated bypass. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"155mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45mm","title":"3RW4027-2BB05","Height":"150mm","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, 24 V AC/DC spring-type 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%","For Main Contacts":"16 ... 10, 1x 8","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 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":"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)","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":"18.5kW","at standard circuit at 50 °C rated value":"25hp","control supply voltage 1 at DC rated value":"24V","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%","relative negative tolerance of the control supply voltage at DC":"-20%","relative positive tolerance of the control supply voltage at DC":"20%","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":"$382.27","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9fb717da81d87c090d64def1eae9b8e3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=428896&mlfb=3RW4027-2BB05"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW4027-2BB05?","answer":"The maximum wire length is 300 m. This is the total cable run from the soft starter to the motor; longer runs may cause reflected wave issues or voltage drop that affect starting performance."},{"question":"Does 3RW4027-2BB05 need an external bypass contactor?","answer":"No — the integrated bypass contact system is built in. Once the motor reaches full speed, the thyristors are bypassed internally, so no external contactor is required for the run state."},{"question":"What ambient temperature range does 3RW4027-2BB05 operate in?","answer":"Operating ambient is -25 to +60 °C. Storage range is -40 to +80 °C. Derate the current above 40 °C per the 29 A at 50 °C and 26 A at 60 °C ratings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4027-2BB05","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/3RW4027-2BB05 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}}