{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4073-2BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4073-2BB45","canonicalUrl":"https://aoctrl.com/siemens/3RW4073-2BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4073-2BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4073-2BB45 soft starter, Size S12, 230 A at 40 °C, 50/60 Hz, 600 V insulation, screw fixing, 278 mm depth.","salesMarkdown":"## 230 A at 40 °C — derating drives the real current budget The 3RW4073-2BB45: This is the headline current, but the real budget is set by the ambient: at 50 °C the unit delivers 205 A, and at 60 °C it drops to 180 A. If your enclosure runs hot near the furnace line, plan on the 180 A ceiling — the 230 A figure assumes a 40 °C environment with no derating. Size S12 frame, 230 mm high, 160 mm wide, 278 mm deep — screw fixing to the back panel. The depth matters for gland-plate clearance; allow the full 278 mm plus the 100 mm upward and 75 mm downward clearance for ventilation and cable bending radius. ## Pollution degree 3 and mounting position flexibility The soft starter handles it without conformal coating on the power board, but the cabinet should maintain basic filtration. Mounting position is flexible: with the additional fan fitted, the unit can be mounted on a vertical surface and rotated ±90° or tilted ±22.5° front-to-back. Without the fan, the tilt range narrows to ±10°. This matters when shoehorning the S12 frame into a tight MCC bucket or a retrofit panel. ## Motor protection and adjustable current limitation Built-in motor overload protection and intrinsic device protection mean the 3RW4073-2BB45 can serve as the sole overload element in the motor branch circuit, provided the downstream contactor and overload relay coordination is respected. The adjustable current limitation lets you set the starting current between 20% and 100% of the rated current — useful for soft-starting conveyors or pumps without mechanical shock. The unit is not configured for inside-delta wiring — it is a standard in-line soft starter. The main circuit connection uses busbar or cable lugs: the back clamping point accepts 250–500 kcmil, the front clamping point 3/0–600 kcmil, and both clamping points together can take 2/0–500 kcmil per side. Wire length to the motor is limited to 300 m maximum.","metaTitle":"Siemens 3RW4073-2BB45 SIRIUS Soft Starter, 230 A, Size S12","metaDescription":"Siemens 3RW4073-2BB45 SIRIUS soft starter, 230 A at 40 °C, 50/60 Hz, Size S12. Active production, quoted to order. Screw fixing, 278 mm depth.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"278mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"160mm","title":"3RW4073-2BB45","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 230 A, 160 kW/500 V, 40 °C 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5073-2AB15<<","During Storage":"-40 ... +80°C","External Reset":"Yes","Finely Stranded":"50 ... 240 mm²","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw fixing","Minimum Load [%]":"20%","For Main Contacts":"2/0 ... 500 kcmil","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":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"230A","at 50 °C rated value":"205A","at 60 °C rated value":"180A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"min. 2x 2/0, max. 2x 500 kcmil","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S12","Using The Back Clamping Point":"250 ... 500 kcmil","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"3/0 ... 600 kcmil","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":"160kW","at standard circuit at 50 °C rated value":"200hp","Finely Stranded Without Core End Processing":"min. 2x 50 mm², max. 2x 185 mm²","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","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 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":"90W","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":"80A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77393ab17ba01f0e5e1991c2eeee3d5a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=520722&mlfb=3RW4073-2BB45"},"ai":{"faq":[{"question":"What is the depth of 3RW4073-2BB45?","answer":"The depth is 278 mm. Combined with the 160 mm width and 230 mm height, the S12 frame requires a minimum enclosure depth of about 300 mm to allow for the screw fixing and cable bend radius behind the unit."},{"question":"Does 3RW4073-2BB45 include motor overload protection?","answer":"Yes, it has built-in motor overload protection and intrinsic device protection. The adjustable current limitation lets you set the starting current between 20% and 100% of the rated current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4073-2BB45","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/3RW4073-2BB45 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}}