{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4434-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4434-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4434-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4434-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4434-2BC44 soft starter, 196 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, adjustable current limitation, screw fixing, 170 x 200 x 270 mm.","salesMarkdown":"## Rated current and thermal derating — what the 196 A figure actually governs The 3RW4434-2BC44: The 196 A rating at 40 °C ambient is the ceiling for continuous motor current in a standard panel environment — provided the enclosure ventilation keeps the internal air below that threshold. At 50 °C the same unit delivers 173 A, and at 60 °C it drops to 152 A. The derating temperature is 40 °C, meaning any installation above that must apply the published curve; a 60 °C ambient cuts the available current by over 20 %, which matters when sizing for a pump or fan that runs near full load in a hot switchroom. The insulation voltage is rated 690 V, and the operating frequency covers 50 to 60 Hz at 230 V nominal. ## Mounting, connection, and panel integration That tilt range is useful when the backpanel is not perfectly plumb or when the starter sits on a swing frame. Dimensions are 170 mm wide, 200 mm high, 270 mm deep — the depth is the dimension that drives cabinet depth; the 270 mm figure means a 300 mm deep enclosure is tight, and 400 mm is comfortable for the busbar or cable bend radius behind it. Main current circuit connection is via busbar, accepting 4 to 250 kcmil. The busbar connection is the preferred method for the main circuit — if you are landing cable, the lug range covers up to 250 kcmil, which is roughly 120 mm², matching the upper end of the stranded range. ## Inside-delta wiring and adjustable current limit — what they mean for the motor circuit The inside-delta circuit capability means the thyristors can be wired in the delta legs of a six-lead motor, reducing the current through each SCR pair to 58 % of the line current. This is the standard configuration for larger soft starters — it halves the device rating needed for a given motor FLA, provided the motor has six leads accessible. The adjustable current limitation lets the user set the starting current between 8 % and roughly 400 % of the motor FLA, depending on the parameterisation; the 8 % minimum load figure is the floor below which the starter may not reliably detect the motor load. Motor overload protection and intrinsic device protection are both onboard — the starter monitors its own thyristor temperature and the motor current, so a separate overload relay is not required for most installations. The fault signal is shown on a display, and an external reset input allows remote clearing of trip conditions, which is standard for unattended pump or conveyor stations. The lifecycle stage is marked as current, meaning Siemens still lists this order code in the active catalog. Pollution degree 3 per IEC 60947-4-2 means the device is rated for industrial environments where conductive pollution occurs or dry non-conductive pollution becomes conductive due to condensation — standard for most control panels not in a climate-controlled clean room. The maximum wire length from starter to motor is 500 m, which is typical for soft starters and limits the cable charging current on long runs.","metaTitle":"Siemens 3RW4434-2BC44 SIRIUS Soft Starter, 196 A at 40°C","metaDescription":"Siemens 3RW4434-2BC44 SIRIUS soft starter, 196 A at 40°C, 690 V insulation, inside-delta capable, adjustable current limit, active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4434-2BC44","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 113 A, 55 kW Inside-delta: 196 A, 110 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5534-2HA14<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"16 ... 95 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"4 ... 250 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":"196A","at 50 °C rated value":"173A","at 60 °C rated value":"152A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"max. 2x 1/0","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"6 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"6 ... 2/0","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":"55kW","at standard circuit at 50 °C rated value":"75hp","Finely Stranded Without Core End Processing":"max. 1x 50 mm², 1x 70 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":"110kW","at inside-delta circuit at 50 °C rated value":"125hp","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%","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":"64W","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":"22A","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/b75d88223baf51965bb91f95ebe11a0b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=109098&mlfb=3RW4434-2BC44"},"ai":{"faq":[{"question":"What is the rated current of 3RW4434-2BC44 at different temperatures?","answer":"The derating starts above 40 °C ambient."},{"question":"Does 3RW4434-2BC44 support inside-delta wiring?","answer":"Yes, the inside-delta circuit capability is present, allowing the thyristors to be wired in the delta legs of a six-lead motor. This reduces the current per SCR pair to about 58 % of line current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4434-2BC44","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/3RW4434-2BC44 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}}