{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4027-2BB15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4027-2BB15","canonicalUrl":"https://aoctrl.com/siemens/3RW4027-2BB15","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4027-2BB15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4027-2BB15 soft starter, S0 frame, 32 A at 40 °C, 45 mm width, 150 mm height, 155 mm depth, spring-loaded terminals, integrated bypass.","salesMarkdown":"## S0 frame, 32 A — the derating curve sets the real limit The 3RW4027-2BB15: The S0 frame size means the power stage and bypass are sized for this current band — the derating above 40 °C is the number that governs the motor FLA you can actually start in a warm panel. An integrated bypass contact system carries the motor current once the start ramp completes, taking the thyristors out of the circuit and eliminating continuous heat dissipation. This keeps the enclosure temperature rise lower than a non-bypassed starter running the same load. The adjustable current limitation lets you set the start current between 20 % and the rated value — useful for soft-starting conveyors or pumps where the load torque curve is known and you want to limit inrush on the supply side. ## Mounting and wiring — screw or snap, spring terminals Fastening is by screw or snap-on mounting onto a DIN rail. The 45 mm width and 150 mm height fit a standard S0 footprint — the 155 mm depth is the dimension to check against enclosure depth, especially if a fan or additional clearance is needed above the unit. Auxiliary and control circuits also use spring-loaded terminals, which speeds wiring in panel assembly — no screw torque control needed. Pollution degree 3 per IEC 60947-4-2 means the starter is rated for industrial environments where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation may occur. This is the standard pollution severity for most control panels without sealed enclosures. ## Control voltage and operating conditions Control supply voltage is 110 … 230 V DC — a wide-range input that covers common DC bus voltages in industrial panels. Operating frequency is 50 … 60 Hz, so the same unit works on 50 Hz or 60 Hz mains without adjustment. The mounting position is flexible: with an additional fan, the unit can be rotated ±90° on a vertical surface and tilted ±22.5° front-to-back; without a fan, rotation is limited to ±10°. Motor overload protection and intrinsic device protection are built in — the starter monitors both the motor current and its own thyristor temperature, reducing the need for external overload relays in many applications.","metaTitle":"Siemens 3RW4027-2BB15 SIRIUS Soft Starter, 32 A, S0 Frame","metaDescription":"Siemens 3RW4027-2BB15 SIRIUS soft starter, 32 A at 40 °C, S0 frame, integrated bypass, spring terminals. Active production; quoted to order. Depth 155 mm.","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":"3RW4027-2BB15","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, 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","during storage acc. to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","For Auxiliary And Control Circuit":"spring-loaded terminals","during operation acc. 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 acc. to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","Product Component Motor Brake Output":"No","reference code acc. to DIN 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","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","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","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"400 ... 600V","protection class IP on the front acc. to IEC 60529":"IP20","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/08fef2bbb922864284ea4a14cd4931c6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=207362&mlfb=3RW4027-2BB15"},"ai":{"faq":[{"question":"What is the depth of 3RW4027-2BB15?","answer":"The depth is 155 mm. Combined with the 45 mm width and 150 mm height, this S0-frame unit fits standard DIN-rail enclosures — check the enclosure depth against the 155 mm plus any clearance for wiring or fan."},{"question":"What compliance documentation does Siemens provide for 3RW4027-2BB15?","answer":"The starter is rated pollution degree 3 per IEC 60947-4-2. Environmental storage conditions follow IEC 60721 classes 1K6, 1C2, 1S2, 1M4; operating conditions follow 3K6, 3C3, 3S2, 3M6. Siemens typically provides CE, UKCA, and UL/CSA declarations for the SIRIUS line — confirm the specific certificates with the order documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4027-2BB15","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/3RW4027-2BB15 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}}