{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4443-2BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4443-2BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4443-2BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4443-2BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4443-2BC46 soft starter, 352 A at 40 °C, 312 A at 50 °C, 270 A at 60 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, inside-delta circuit, screw fixing, 298 mm depth, 210 mm width, 230 mm height.","salesMarkdown":"## Active production, derated current profile The 3RW4443-2BC46: The 40 °C figure is the reference for panel sizing; if your enclosure ambient runs above 40 °C, the 50 °C or 60 °C column is the one that governs the motor FLA match. ## Thyristor stack and inside-delta wiring Built around a thyristor power section — no mechanical contacts to weld or pit during the start cycle. The inside-delta circuit topology is supported, which lets you wire the soft starter between the motor windings rather than in the supply lines, reducing the per-phase current the unit carries by roughly 58 % for a given motor rating. Pollution degree 3 per IEC 60947-4-2 means it tolerates conductive dust and condensation typical in industrial panel environments. ## Mounting and connection — panel layout constraints Mounting position allows a vertical surface with ±90° rotation and ±22.5° tilt forward/back. Screw fixing to the backplate — no DIN-rail clip, so plan for drilled and tapped mounting points. Dimensions are 298 mm deep by 210 mm wide by 230 mm high; the depth is the dimension that governs enclosure depth, not the width. Main circuit connections accept busbar or cable: stranded 70–240 mm², finely stranded 50–240 mm², or AWG/kcmil from 2/0 up to 500 kcmil using both clamping points. The back clamping point takes 250–500 kcmil, the front takes 3/0–600 kcmil. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The 5 mm side gap is tight — adjacent devices or cable ducts must not encroach into that zone for airflow and arc flash clearance. ## Protection, display, and control features Motor overload protection and intrinsic device protection are built in — no separate overload relay needed for the soft starter itself. Adjustable current limitation lets you set the start current below the full-load locked-rotor value, and the minimum load threshold is 8 % of the rated current. A display provides fault signal readout on the unit. External reset input is present, so the starter can be reset from a remote pushbutton or PLC digital output without opening the panel door. Maximum motor cable length is 500 m — relevant for installations where the starter is in an MCC room and the motor is at the far end of a long cable run. Storage temperature range is -25 to +80 °C; operating ambient max is 60 °C.","metaTitle":"Siemens 3RW4443-2BC46 SIRIUS Soft Starter, 352 A at 40 °C","metaDescription":"Siemens 3RW4443-2BC46 SIRIUS soft starter, rated 352 A at 40 °C, 312 A at 50 °C, 270 A at 60 °C. Active production. Thyristor-based, inside-delta capable.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"298mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"210mm","title":"3RW4443-2BC46","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 203 A, 200 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-2HA16<<","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 (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","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":"spring-loaded 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 (0.25 ... 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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"200kW","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%","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/4379574a70a8faf357df305de53256d3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=389390&mlfb=3RW4443-2BC46"},"ai":{"faq":[{"question":"What is the closest alternative to the 3RW4443-2BC46 in the SIRIUS soft starter family?","answer":"No official successor or direct cross-reference is recorded from Siemens. Within the SIRIUS 3RW44 series, the 3RW4443-2BC46 is a specific current rating tier (352 A at 40 °C); a lower or higher current variant in the same frame size would require a different order code. Confirm the motor FLA and ambient temperature against the derating table before selecting an alternative."},{"question":"What compliance documentation is available for the 3RW4443-2BC46?","answer":"The part carries pollution degree 3 rating per IEC 60947-4-2. Standard Siemens declarations (CE, UKCA, RoHS, REACH) apply to the SIRIUS series; specific certification documents are issued against the serialized unit at time of manufacture. No UL or CSA listing is explicitly stated in the available spec record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4443-2BC46","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/3RW4443-2BC46 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}}