{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4037-2BB04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4037-2BB04","canonicalUrl":"https://aoctrl.com/siemens/3RW4037-2BB04","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4037-2BB04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 63 A at 40 °C, 24 VDC control voltage, size S2, with integrated bypass and screw-type terminals.","salesMarkdown":"The Siemens 3RW4037-2BB04 is a SIRIUS soft starter in size S2, rated 63 A at 40 °C for standard motor starting duty. The adjustable current limitation and built-in motor overload protection let you set the starting ramp to match the load without adding an external relay. The S2 footprint is 55 mm wide, 160 mm high, and 170 mm deep, with clearance requirements of 60 mm upward, 40 mm downward, and 30 mm at the side. For vertical mounting surfaces, the unit can be rotated ±90° with an additional fan, or tilted ±22.5° front-to-back; without the fan, rotation is limited to ±10°. ## Environmental and Electrical Ratings Derating begins above 40 °C: the unit delivers 58 A at 50 °C and 53 A at 60 °C. Insulation voltage is rated 600 V, and the maximum motor cable length is 300 m. Main power connections use screw-type terminals. The main circuit accepts stranded wire from 1.5 mm² to 25 mm² (two conductors per clamp) and solid wire from 0.25 mm² to 2.5 mm² (two conductors per clamp). Auxiliary contact terminals accept 24 AWG to 14 AWG. The unit supports an external reset and provides a red fault signal display.","metaTitle":"Siemens 3RW4037-2BB04 SIRIUS Soft Starter, 63 A, 24 VDC","metaDescription":"Siemens 3RW4037-2BB04 SIRIUS soft starter, 63 A at 40 °C, 24 VDC control, integrated bypass, adjustable current limit. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"170mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55mm","title":"3RW4037-2BB04","Height":"160mm","Upwards":"60mm","Stranded":"2x (1.5 ... 25 mm²)","Downwards":"40mm","Thyristors":"Yes","At The Side":"30mm","description":"SIRIUS soft starter S2 63 A, 30 kW/400 V, 40 °C 200-480 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%","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":"63A","at 50 °C rated value":"58A","at 60 °C rated value":"53A","For Auxiliary Contacts":"2x (24 ... 14)","For Main Current Circuit":"screw-type terminals","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (16 ... 2)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S2","Using The Back Clamping Point":"16 ... 2","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"18 ... 2","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":"30kW","at standard circuit at 50 °C rated value":"40hp","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":"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":"-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":"12W","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":"26A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$562.61","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a35f558f2f24628434f23d1f0d09d0e4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=440160&mlfb=3RW4037-2BB04"},"ai":{"faq":[{"question":"Where can I buy 3RW4037-2BB04 soft starter?","answer":"The 3RW4037-2BB04 is available to order through our sourcing desk. Submit an RFQ for current pricing and lead time confirmation."},{"question":"What is the rated current of 3RW4037-2BB04?","answer":"The soft starter is rated 63 A at 40 °C, derating to 58 A at 50 °C and 53 A at 60 °C."},{"question":"What is the difference between 3RW4037-2BB04 and 3RW4037-2BB03?","answer":"The evidence does not provide a direct comparison between these two order codes. For fit confirmation, reference the full datasheet or submit the BOM line for a cross-check against your installed unit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4037-2BB04","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/3RW4037-2BB04 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}}