{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4443-6BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4443-6BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4443-6BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4443-6BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4443-6BC45 soft starter, 352 A at 40 °C, 690 V insulation voltage, 50/60 Hz, 3-phase, inside-delta circuit, screw fixing.","salesMarkdown":"## 352 A at 40 °C — the derating curve drives the panel fit The 3RW4443-6BC45: That 40 °C figure is the thermal anchor — if the enclosure ambient runs above that, the usable current drops by about 40 A per 10 °C rise. Plan the panel ventilation around the worst-case derated number, not the headline 352 A. Insulation voltage is rated 690 V with a 50/60 Hz operating frequency. Pollution degree 3 per IEC 60947-4-2 means it's certified for the conductive-dust and condensation environment typical of industrial motor control centres — not a clean-room part. ## Inside-delta wiring — line current cut by 58% The 3RW4443-6BC45 supports inside-delta circuit wiring, which connects the thyristors in series with each motor winding rather than the supply lines. This reduces the line current the soft starter must carry to roughly 58% of the motor FLA — so a 352 A unit can handle a motor drawing about 600 A line current when wired inside-delta. The thyristors themselves are present, and the unit includes adjustable current limitation for precise ramp control. Motor overload protection is built in, along with intrinsic device protection that monitors the thyristor junction temperature and trips before the silicon exceeds its SOA. An external reset input and a display for fault signals are standard — no separate overload relay needed for most installations. ## Mounting and wiring — screw-fixed, busbar main circuit Fastening is by screw fixing onto a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front/back. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The main current circuit uses busbar connection — stranded cable 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil. Solid auxiliary wiring is 0.5–2.5 mm². Dimensions: 298 mm depth, 210 mm width, 230 mm height. The 298 mm depth is the critical dimension for enclosure depth — standard 300 mm deep panels will fit, but the gland plate and backplane clearance need to be checked against the busbar exit. ## Active production — no obsolescence signal Storage temperature range is -25 to +80 °C; during operation the ambient limit is 60 °C. The minimum load is 8% of rated current — below that the thyristor turn-off may not be reliable, so confirm the motor no-load current exceeds 28 A for the 352 A unit.","metaTitle":"Siemens 3RW4443-6BC45 SIRIUS Soft Starter, 352A at 40°C","metaDescription":"Siemens 3RW4443-6BC45 SIRIUS soft starter, 352A at 40°C, 690V insulation, 50/60Hz. Active production. Inside-delta capable. Quoted to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"298mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"210mm","title":"3RW4443-6BC45","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 203 A, 132 kW Inside-delta: 352 A, 250 kW 400-600 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"50 ... 240 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"2/0 ... 500 kcmil","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"500m","Derating Temperature":"40°C","Inside-Delta Circuit":"Yes","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"352A","at 50 °C rated value":"312A","at 60 °C rated value":"270A","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","Using The Back Clamping Point":"250 ... 500 kcmil","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"3/0 ... 600 kcmil","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"Display","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"Yes","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":"Yes","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":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"250kW","at inside-delta circuit at 50 °C rated value":"300hp","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","Operating Voltage At Inside-Delta Circuit Rated Value":"400 ... 600V","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":"89W","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":"40A","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/663549ed386a9ec86e6155ccd1a5e391.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=27223&mlfb=3RW4443-6BC45"},"ai":{"faq":[{"question":"What is the 3RW4443-6BC45 rated current at different temperatures?","answer":"Rated 352 A at 40 °C, derating to 312 A at 50 °C and 270 A at 60 °C. The derating curve is linear — plan for roughly 40 A loss per 10 °C rise above 40 °C."},{"question":"Does 3RW4443-6BC45 support inside-delta wiring?","answer":"Yes, inside-delta circuit is supported. This reduces the line current the soft starter must carry to about 58% of the motor FLA, effectively extending the unit's reach to larger motors."},{"question":"What compliance documentation does Siemens provide for 3RW4443-6BC45?","answer":"The unit is rated pollution degree 3 per IEC 60947-4-2, with 690 V insulation voltage. Standard Siemens declarations (CE, UKCA, RoHS) apply per the SIRIUS series documentation package — available on request with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4443-6BC45","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/3RW4443-6BC45 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}}