{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4424-1BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4424-1BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4424-1BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4424-1BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW44 series soft starter, 3RW4424-1BC44, 81 A at 40 °C, 690 V insulation voltage, integrated bypass, screw fixing.","salesMarkdown":"The Siemens 3RW4424-1BC44 is a SIRIUS 3RW44 soft starter for three-phase induction motors, built around thyristor stacks with an integrated bypass contact system that removes the semiconductors from the circuit once the motor reaches full speed — cutting heat dissipation in the enclosure and extending the life of the power stage. Rated 81 A at 40 °C, it derates to 73 A at 50 °C and 64 A at 60 °C, so the ambient temperature inside the panel directly governs the motor current it can handle — a 40 °C panel buys you the full nameplate; a 50 °C panel loses about 10 % of the rating. Insulation voltage is rated 690 V, operating frequency 50 … 60 Hz at 230 V, and the unit supports inside-delta circuit wiring — a configuration that lets a smaller-rated soft starter control a larger motor by placing the thyristors in the delta legs rather than the line. Motor overload protection is built in, adjustable current limitation is standard, and the minimum load is 8 % of the rated current — meaning it can handle very lightly loaded motors or unloaded starts without dropping out. Fastened by screw fixing to a vertical mounting surface; the unit can be rotated ±90° or tilted ±22.5° front-to-back, giving flexibility in tight enclosures. Dimensions are 170 mm wide, 192 mm high, 270 mm deep — a substantial footprint that needs 100 mm clearance above, 75 mm below, and 5 mm at the sides for airflow and wiring access. Main current circuit uses box terminals accepting stranded 2x (4 … 50 mm²) or solid 2x (0.5 … 2.5 mm²); auxiliary and control circuits use screw-type terminals for 2x (20 … 14 AWG). Maximum motor cable length is 500 m — relevant when the starter is panel-mounted far from the motor, as long cable runs increase charging current that can nuisance-trip the overload. ## Environmental and protection features Operating temperature range is 60 °C maximum during operation; storage range is -25 … +80 °C. Intrinsic device protection (over-temperature monitoring of the thyristors) is included, and an external reset input allows remote fault clearing — useful for unattended or remote installations. Fault signals are shown on an integrated display, not just a single LED — giving a plain-text or coded fault message that speeds troubleshooting.","metaTitle":"Siemens 3RW4424-1BC44 SIRIUS Soft Starter, 81A at 40°C","metaDescription":"Siemens SIRIUS 3RW4424-1BC44 soft starter, 81A rated at 40°C, 690V insulation voltage, integrated bypass, current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4424-1BC44","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 47 A, 22 kW Inside-delta: 81 A, 45 kW 200-460 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5524-1HA14<<","During Storage":"-25 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","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":"81A","at 50 °C rated value":"73A","at 60 °C rated value":"64A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"box terminal","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (10 ... 1/0)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"10 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"10 ... 2/0","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":"22kW","at standard circuit at 50 °C rated value":"25hp","Finely Stranded Without Core End Processing":"2x (4 ... 35 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":"45kW","at inside-delta circuit at 50 °C rated value":"50hp","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","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","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":"32W","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":"9A","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":"$1,869.00 – $2,922.27","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/24337564b2824777c96fe54d5faa862c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=280594&mlfb=3RW4424-1BC44"},"ai":{"faq":[{"question":"What are the key current ratings at different ambient temperatures?","answer":"81 A at 40 °C, 73 A at 50 °C, and 64 A at 60 °C. Derating begins above 40 °C."},{"question":"What is the insulation voltage and frequency rating?","answer":"Rated insulation voltage is 690 V; operating frequency is 50 … 60 Hz at 230 V."},{"question":"Does it have an integrated bypass contactor?","answer":"Yes, the integrated bypass contact system removes the thyristors from the circuit after starting, reducing heat and extending component life."},{"question":"What are the physical dimensions and mounting requirements?","answer":"170 mm wide, 192 mm high, 270 mm deep. Requires 100 mm clearance above, 75 mm below, and 5 mm at the sides. Mounts via screw fixing on a vertical surface."},{"question":"What wire sizes does the main circuit accept?","answer":"Box terminals accept stranded 2x (4 … 50 mm²) or solid 2x (0.5 … 2.5 mm²). Auxiliary circuits use screw terminals for 2x (20 … 14 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4424-1BC44","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/3RW4424-1BC44 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}}