{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4073-6BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4073-6BB44","canonicalUrl":"https://aoctrl.com/siemens/3RW4073-6BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4073-6BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4073-6BB44 soft starter, size S12, 230 A at 40 °C, 205 A at 50 °C, 180 A at 60 °C, 230 V control supply, thyristor-switched, adjustable current limitation, motor overload protection.","salesMarkdown":"Derate to 205 A at 50 °C and 180 A at 60 °C — the thermal limit governs the real-world install, so size for the ambient in your enclosure. Operating frequency range is 50 to 60 Hz, covering standard line frequencies globally. Built-in motor overload protection and adjustable current limitation let you set the start current profile without an external overload relay. An external reset input is provided for remote restart after a fault trip. Intrinsic device protection monitors internal temperature and faults — no separate motor PTC needed for the starter itself. Dimensions: 230 mm high, 160 mm wide, 278 mm deep. Mounts via screw fixing to a vertical panel surface. With the additional fan, the mounting surface can be rotated up to +/-90° and tilted +/-22.5° front-to-back. Without the fan, rotation is limited to +/-10° and tilt to +/-10°. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. Main current circuit connects via busbar connection. Wire ranges: stranded 70 to 240 mm², finely stranded 50 to 240 mm². For kcmil terminations, the front clamping point accepts 3/0 to 600 kcmil, the back clamping point 250 to 500 kcmil, and using both clamping points together accepts 2/0 to 500 kcmil per side. Auxiliary contacts accept 20 to 14 AWG solid wire. Maximum motor cable length is 300 m — keep this in mind for long runs to avoid voltage drop affecting the soft starter's commutation. Derating begins at 40 °C. Not configured for inside-delta circuit wiring — this is a standard in-line soft starter.","metaTitle":"Siemens 3RW4073-6BB44 SIRIUS Soft Starter, 230A at 40°C","metaDescription":"Siemens SIRIUS 3RW4073-6BB44 soft starter, size S12. Rated 230 A at 40 °C, 205 A at 50 °C, 180 A at 60 °C. Thyristor-switched with adjustable current limitation and motor overload","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"278mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"160mm","title":"3RW4073-6BB44","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 230 A, 132 kW/400 V, 40 °C 200-460 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5073-6AB14<<","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 (20 ... 14)","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":"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":"132kW","at standard circuit at 50 °C rated value":"150hp","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":"200 ... 460V","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 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":"$1,710.00 – $2,171.70","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/173447028e7dbab26260f727614e58d3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=494614&mlfb=3RW4073-6BB44"},"ai":{"faq":[{"question":"What are the key current ratings for this soft starter?","answer":"Rated 230 A at 40 °C, derated to 205 A at 50 °C, and 180 A at 60 °C. The 40 °C figure is the headline rating; the 50 °C and 60 °C values govern real-world installs in warm enclosures."},{"question":"What is the physical size and mounting method?","answer":"Size S12, measuring 230 mm high, 160 mm wide, 278 mm deep. Mounts with screw fixing to a vertical panel. Clearance: 100 mm above, 75 mm below, 5 mm at the sides."},{"question":"What wire sizes does it accept for power connections?","answer":"Stranded 70 to 240 mm², finely stranded 50 to 240 mm². For kcmil: front clamp 3/0 to 600 kcmil, back clamp 250 to 500 kcmil, both clamps 2/0 to 500 kcmil per side."},{"question":"Does it include motor overload protection?","answer":"Yes, built-in motor overload protection and adjustable current limitation are standard. An external reset input allows remote restart after a fault."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4073-6BB44","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/3RW4073-6BB44 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}}