{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4075-6BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4075-6BB44","canonicalUrl":"https://aoctrl.com/siemens/3RW4075-6BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4075-6BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, size S12, order code 3RW4075-6BB44, rated 356 A at 40 °C, 230 V at 50/60 Hz, thyristor-based with adjustable current limitation and motor overload protection.","salesMarkdown":"## Soft starter for motor starting duty Thyristor-based output stages handle the inrush; the unit carries an adjustable current limitation and integral motor overload protection. At 40 °C ambient it is rated for 356 A, derating to 315 A at 50 °C and 280 A at 60 °C. The control supply is 230 V at 50 or 60 Hz. Mounting is screw-fixing to a vertical surface. With the additional fan fitted, the unit can be rotated ±90° or tilted ±22.5° front-to-back; without the fan, rotation and tilt are limited to ±10°. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides. ## Current ratings and thermal derating Above 40 °C, derate linearly: 315 A at 50 °C, 280 A at 60 °C. The minimum load is 20 % of the rated current — below that, the thyristor firing angle may not produce a clean waveform. Insulation voltage is rated 600 V, pollution degree 3 per IEC 60947-4-2. ## Wiring and connection Main power connections accept busbar or cable. For the main current circuit, the front clamping point accepts 3/0 to 600 kcmil, the back clamping point 250 to 500 kcmil, and using both clamping points together 2/0 to 500 kcmil. Stranded cable: 70 to 240 mm²; finely stranded: 50 to 240 mm². Solid auxiliary wiring: 2x (0.5 to 2.5 mm²). Maximum wire length from the soft starter to the motor is 300 m.","metaTitle":"Siemens 3RW4075-6BB44 SIRIUS Soft Starter, 356A at 40°C","metaDescription":"Siemens 3RW4075-6BB44 SIRIUS soft starter, size S12, rated 356A at 40°C. Thyristor-based, adjustable current limitation, motor overload protection. Sourced to order against RFQ.","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":"3RW4075-6BB44","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 356 A, 200 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 >>3RW5075-6AB14<<","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":"356A","at 50 °C rated value":"315A","at 60 °C rated value":"280A","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":"200kW","at standard circuit at 50 °C rated value":"250hp","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":"125W","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":"131A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3,216.91 – $3,800.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/67e95ce143d5efa34f322235f3fc8cf1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=422079&mlfb=3RW4075-6BB44"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RW4075-6BB44?","answer":"Submit an RFQ through this listing. The part is sourced to order; current pricing and stock status are confirmed at quote time."},{"question":"What are the key ratings for 3RW4075-6BB44?","answer":"Rated 356 A at 40 °C, 230 V control supply at 50/60 Hz, size S12. Thyristor-based with adjustable current limitation and motor overload protection."},{"question":"What clearance is needed around 3RW4075-6BB44?","answer":"100 mm above, 75 mm below, and 5 mm at the sides."},{"question":"What compliance documentation does Siemens provide for 3RW4075-6BB44?","answer":"The part carries pollution degree 3 per IEC 60947-4-2 and insulation voltage rating of 600 V. Standard Siemens declarations (RoHS, REACH, UL, IEC) are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4075-6BB44","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/3RW4075-6BB44 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}}