{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4037-2BB14","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4037-2BB14","canonicalUrl":"https://aoctrl.com/siemens/3RW4037-2BB14","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4037-2BB14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4037-2BB14 soft starter, size S2, 63 A at 40 °C, 55 x 160 x 170 mm, screw and snap-on mounting, integrated bypass, 110-230 V DC control supply.","salesMarkdown":"The 3RW4037-2BB14: The bypass contact system means the thyristors only handle the start transient — during continuous run, current passes through the bypass contacts, dropping the heat load inside the enclosure and letting you size the panel ventilation for the start duty, not the full-run dissipation. ## Temperature derating and enclosure planning Rated current steps down with ambient: 63 A at 40 °C, 58 A at 50 °C, 53 A at 60 °C (-). If the panel ambient hits 50 °C, you lose 5 A of continuous motor capacity — plan the thermal budget before you lock the gland plate. The S2 frame measures 55 mm wide by 160 mm high by 170 mm deep. Snap-on DIN rail mounting with an additional screw fastening point keeps it secure under vibration in a mobile or conveyor-side panel. Clearance requirements: 60 mm above, 40 mm below, 30 mm at the sides. Stack multiple units side by side at the 30 mm gap and the derating curve shifts — allow the full free-air spacing if you want the 63 A figure at 40 °C. ## Control supply and wiring terminals Control supply accepts 110 to 230 V DC — common for 125 V DC control buses in industrial plants or 220 V DC battery-backed systems. The wide input range means it works across sites without a separate DC-DC converter. Maximum motor cable length is 300 m — beyond that, reflected wave voltage spikes at the motor terminals can stress the winding insulation, especially on 480 V and 600 V systems. ## Pollution degree 3 and operating range This is the standard for control panels in manufacturing environments not sealed to IP54. Operating ambient -25 to +60 °C, storage -40 to +80 °C. The thyristor junction temperature tracks the ambient plus the I²t of the start pulse — at 60 °C ambient you are at the derated 53 A ceiling, so a heavy start (long acceleration, high inertia load) may need a larger frame. Insulation voltage rated 600 V — suitable for 400 V and 480 V systems. Operating frequency 50/60 Hz.","metaTitle":"Siemens 3RW4037-2BB14 SIRIUS Soft Starter, 63A, Size S2","metaDescription":"Siemens 3RW4037-2BB14 SIRIUS soft starter, 63A at 40°C, size S2, integrated bypass, 110-230V DC control. Current production, quoted 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":"3RW4037-2BB14","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, 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%","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":"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","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":"30kW","at standard circuit at 50 °C rated value":"40hp","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":"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/5e0d70148a01c6c93fb854830cb3b187.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=204972&mlfb=3RW4037-2BB14"},"ai":{"faq":[{"question":"How can I order the 3RW4037-2BB14 or check availability?","answer":"Sourced through independent distribution channels. No stock-holding claim — availability is verified per inquiry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4037-2BB14","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/3RW4037-2BB14 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}}