{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4027-2BB14","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4027-2BB14","canonicalUrl":"https://aoctrl.com/siemens/3RW4027-2BB14","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4027-2BB14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4027-2BB14 soft starter, 32 A at 40°C, 45 mm width, S0 frame, spring-loaded terminals, integrated bypass contactor, 110-230 V DC control supply.","salesMarkdown":"## S0 frame, 32 A at 40°C — the current rating that governs the motor The 3RW4027-2BB14 is a SIRIUS soft starter in the S0 frame size, rated 32 A at 40°C. That 32 A is the continuous current at the derating temperature floor — above 40°C the output drops to 29 A at 50°C and 26 A at 60°C, so the ambient in the panel decides the real motor current this unit can carry. The integrated bypass contactor takes the thyristors out of the circuit once the motor is at speed, so the 32 A rating applies to the bypass path, not just the start cycle. That means it can run continuously at rated current without derating the silicon for sustained operation. ## Spring-loaded terminals and snap-on DIN rail — panel fit without extra hardware Both the main current circuit and the auxiliary/control circuit use spring-loaded terminals — no screw torque to check, no loose connections from vibration. Mounting is screw and snap-on — the 45 mm width clips onto standard DIN rail, and the screw holes give a positive fix in high-vibration panels. The mounting position allows ±10° rotation on a vertical surface without a fan; with the optional fan, it can rotate ±90° and tilt ±22.5°. ## Adjustable current limit and motor overload — one device, two protection functions The soft starter includes motor overload protection and intrinsic device protection, plus adjustable current limitation that lets you set the start current between 20% and the rated value. That means you don't need a separate overload relay for most applications — the unit handles both the soft start ramp and the running protection. The control supply voltage is 110... 230 V DC, which covers common DC bus voltages in industrial panels. The operating frequency is 50... 60 Hz, so it works on either line frequency without adjustment. The insulation voltage is rated 600 V, and the pollution degree is 3 per IEC 60947-4-2 — suitable for industrial environments where conductive dust or condensation is present.","metaTitle":"Siemens 3RW4027-2BB14 SIRIUS Soft Starter, 32 A, 45 mm, S0","metaDescription":"Siemens 3RW4027-2BB14 SIRIUS soft starter, 32 A at 40°C, 45 mm width, S0 frame, spring-loaded terminals, integrated bypass. 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 (0.25 ... 2.5 mm²)","Width":"45mm","title":"3RW4027-2BB14","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, 110-230 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 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)","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":"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","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 (0.25 ... 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","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":"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%","Adjustable Motor Current For Motor Overload Protection Minimum Rated Value":"17A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$332.74","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2b2402e84347e0a1951a10d45fbec6ab.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=521261&mlfb=3RW4027-2BB14"},"ai":{"faq":[{"question":"What is the closest alternative to 3RW4027-2BB14 in the SIRIUS soft starter family?","answer":"The 3RW4027-2BB14 is a current-production unit; if a different current rating or frame size is needed, the SIRIUS 3RW40 series offers other S0-frame variants with similar terminal and bypass features."},{"question":"What compliance documentation does Siemens provide for 3RW4027-2BB14?","answer":"The pollution degree is 3 per IEC 60947-4-2, and the insulation voltage is 600 V. The storage environment follows IEC 60721 classes 1K6, 1C2, 1S2, and 1M4. RoHS, REACH, and UL documentation are typically available from Siemens for current-production SIRIUS devices; confirm with the factory or your distributor for the specific certificate numbers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4027-2BB14","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/3RW4027-2BB14 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}}