{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4436-2BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4436-2BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4436-2BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4436-2BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4436-2BC45 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, adjustable current limitation, inside-delta circuit, screw fixing, 270 mm depth.","salesMarkdown":"## Rated current and thermal derating — what 281 A means on the panel The 3RW4436-2BC45: Thyristor-based output with adjustable current limitation lets you set the start ramp peak below the motor's locked-rotor draw, reducing mechanical shock on the load train. The inside-delta circuit configuration means the soft starter can be wired in the motor delta loop, reducing the unit's current rating requirement compared to in-line connection. ## Mounting and connection — screw-fixed, multi-cable entry Mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front/back — fits into tight panel layouts where the gland plate orientation is fixed. Fastening method is screw fixing, not DIN rail snap-on, so plan for drilled holes and M6 or M8 hardware. Main current circuit accepts busbar connection or cable: stranded 25–120 mm², finely stranded 16–95 mm², or AWG 4–250 kcmil. The front and back clamping points each handle 6–2/0 AWG; using both clamping points maxes at 2x 1/0 AWG. Clearance spaces: 100 mm upwards, 75 mm downwards, 5 mm at the side — essential for airflow and cable bending radius. Maximum wire length to the motor is 500 m; longer runs increase voltage drop and may cause nuisance overcurrent trips during start. ## Protection and diagnostics — built-in overload and fault display Motor overload protection is integrated, so a separate thermal overload relay is not needed for most installations. Intrinsic device protection (thyristor overtemperature, phase imbalance) is also included, reducing external monitoring hardware. Fault signal is shown on a display (not just a single LED), giving a readable code for troubleshooting — useful when the panel is remote from the operator station. External reset input allows remote clearing after a fault, avoiding a trip to the cabinet. Minimum load is 8% of the rated current — below that the soft starter may not detect the motor current correctly, so verify the no-load or light-load condition. Compliance documentation includes IEC 60947-4-2 (pollution degree 3), operating frequency 50/60 Hz, and storage temperature range -25 to +80 °C.","metaTitle":"Siemens 3RW4436-2BC45 SIRIUS Soft Starter, 281 A, 690 V","metaDescription":"Siemens 3RW4436-2BC45 SIRIUS soft starter, 281 A at 40°C, 690 V insulation voltage, thyristor-based, adjustable current limitation, inside-delta circuit","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":"3RW4436-2BC45","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 162 A, 110 kW Inside-delta: 281 A, 200 kW 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5536-2HA16<<","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":"281A","at 50 °C rated value":"251A","at 60 °C rated value":"217A","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":"110kW","at standard circuit at 50 °C rated value":"125hp","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":"200kW","at inside-delta circuit at 50 °C rated value":"250hp","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%","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":"95W","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":"32A","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/0ede2bc1a831405662537cf896a58342.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=532066&mlfb=3RW4436-2BC45"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 3RW4436-2BC45 in this Soft Starters family?","answer":"The 3RW4436-2BC45 is a current-production SIRIUS soft starter; any parametric substitute would require verifying the same current rating, inside-delta capability, and mounting footprint."},{"question":"What compliance documentation does Siemens provide for 3RW4436-2BC45?","answer":"The unit complies with IEC 60947-4-2 (pollution degree 3) and is rated for 50/60 Hz operation. Storage temperature range is -25 to +80 °C; operating ambient up to 60 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4436-2BC45","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/3RW4436-2BC45 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}