{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4037-2BB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4037-2BB05","canonicalUrl":"https://aoctrl.com/siemens/3RW4037-2BB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4037-2BB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4037-2BB05 soft starter, Size S2, 63 A at 40 °C, 50/60 Hz, integrated bypass contact, screw terminals, active production.","salesMarkdown":"## Size S2 frame and panel integration The 3RW4037-2BB05: The Size S2 frame measures 55 mm wide by 160 mm high by 170 mm deep. Screw and snap-on mounting to DIN rail — the 55 mm width fits standard 35 mm DIN rail without overhang. Clearance requirements: 60 mm above, 40 mm below, 30 mm at the side. The mounting position is flexible: with the optional fan, the unit can be rotated ±90° or tilted ±22.5°; without the fan, rotation is limited to ±10°. ## Terminal sizing and wire range Maximum wire length to the motor is 300 m — this limits voltage drop and capacitive charging current on long cable runs. The auxiliary contact block accepts 2x (24... 14) AWG. ## Environmental and protection ratings Pollution degree 3 per IEC 60947-4-2 — the soft starter is rated for conductive dust environments typical of industrial panels. Insulation voltage rated 600 V. Motor overload protection and intrinsic device protection are both built in. The adjustable current limitation lets the user set the start current between 20% and the rated value.","metaTitle":"Siemens 3RW4037-2BB05 SIRIUS Soft Starter, 63 A, Size S2","metaDescription":"Siemens 3RW4037-2BB05 SIRIUS soft starter, 63 A at 40 °C, Size S2 frame, integrated bypass, active production. Quoted to order against BOM quantities.","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":"3RW4037-2BB05","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, 37 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%","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":"37kW","at standard circuit at 50 °C rated value":"50hp","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":"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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3add6a2022e1e3e7cf9278b64174b279.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=340689&mlfb=3RW4037-2BB05"},"ai":{"faq":[{"question":"What is the continuous current rating of 3RW4037-2BB05 at 40 °C?","answer":"It derates to 58 A at 50 °C and 53 A at 60 °C."},{"question":"Does 3RW4037-2BB05 include an internal bypass contact?","answer":"Yes, the 3RW4037-2BB05 has an integrated bypass contact system. This eliminates the need for an external bypass contactor, reducing panel wiring and heat dissipation after the motor reaches full speed."},{"question":"How can I order 3RW4037-2BB05 or check availability?","answer":"Submit an RFQ for current availability and volume pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4037-2BB05","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/3RW4037-2BB05 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}}