{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW3028-1BB04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW3028-1BB04","canonicalUrl":"https://aoctrl.com/siemens/3RW3028-1BB04","factsUrl":"https://aoctrl.com/api/mcp/products/3RW3028-1BB04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW3028-1BB04, S0 frame, 38 A at 40 °C, 24 V AC control, integrated bypass, screw terminals.","salesMarkdown":"## Siemens 3RW3028-1BB04 — SIRIUS Soft Starter, 38 A, S0 Frame The Siemens 3RW3028-1BB04 is a SIRIUS soft starter in the S0 frame size, rated 38 A at 40 °C, 34 A at 50 °C, and 31 A at 60 °C. Control voltage is 24 V AC at both 50 and 60 Hz. An integrated bypass contact system means the thyristors are shorted out after start, reducing heat dissipation in continuous run. The mounting position allows ±10° rotation and ±10° tilt from vertical. Derating begins at 40 °C. At 50 °C the current drops to 34 A, at 60 °C to 31 A. Minimum load is 10 % of rated current — below that the soft starter may not trigger reliably. Insulation voltage rated 600 V. Operating frequency 50 … 60 Hz. Maximum motor cable length 300 m — keep that in mind for remote motor runs. No integrated motor overload protection, no intrinsic device protection, no adjustable current limitation, no motor brake output. Inside-delta circuit not supported — this is a standard in-line soft starter, not a six-wire configuration. ## Dimensions and Clearances Width 45 mm, height 125 mm, depth 150 mm. Required clearances: 60 mm upwards, 40 mm downwards, 15 mm at the sides. Solid wire capacity: 2 x (0.5 … 2.5 mm²). Auxiliary contacts accept 2 x (20 … 14 AWG). Front clamping point accepts 1 x 8 AWG or 2 x (16 … 10 AWG).","metaTitle":"Siemens 3RW3028-1BB04 SIRIUS Soft Starter, 38A, S0 Frame, 24","metaDescription":"Siemens 3RW3028-1BB04 SIRIUS soft starter, 38 A rated at 40 °C, S0 frame, 24 V AC/50-60 Hz control voltage, integrated bypass, screw terminals. Active lifecycle, sourced to order a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"150mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"45mm","Height":"125mm","Upwards":"60mm","Downwards":"40mm","Thyristors":"Yes","At The Side":"15mm","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%","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":"38A","at 50 °C rated value":"34A","at 60 °C rated value":"31A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"screw-type 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":"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","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","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%","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":"19W","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":"$507.21","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=90265&mlfb=3RW3028-1BB04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RW3028-1BB04/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 3RW3028-1BB04?","answer":"Rated 38 A at 40 °C, 34 A at 50 °C, 31 A at 60 °C. Control voltage 24 V AC at 50/60 Hz. Insulation voltage 600 V. Integrated bypass. S0 frame, 45 mm wide."},{"question":"Where can I buy 3RW3028-1BB04?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW3028-1BB04","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/3RW3028-1BB04 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}