{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4436-2BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4436-2BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4436-2BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4436-2BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4436-2BC36 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, inside-delta circuit, adjustable current limitation, motor overload protection, screw fixing, 270 mm depth.","salesMarkdown":"## Rated current and thermal derating — the real-world limit The 3RW4436-2BC36: At 40 °C ambient, the soft starter is rated 281 A continuous. That drops to 251 A at 50 °C and 217 A at 60 °C. The derating is linear over that range — if the panel ambient runs above 40 °C, the load current must be reduced proportionally. The insulation voltage is rated 690 V, and the operating frequency covers 50 to 60 Hz. The minimum load is 8 % of the rated current — below that, the thyristor firing angle may not be reliable for some motor types. ## Wiring and termination — what fits the lugs Main circuit termination accepts stranded wire from 25 to 120 mm², or 4 to 250 kcmil. The main current circuit also supports busbar connection — common in high-current panels where lugging every phase individually is preferred. The depth is 270 mm, width 170 mm, height 200 mm — plan the gland plate and door clearance accordingly. ## Protection and control features built in Motor overload protection and intrinsic device protection are integrated — no separate overload relay needed for most applications. Adjustable current limitation lets you set the starting current between 8 % and the rated value, reducing mechanical stress on the driven load. The soft starter uses thyristors in an inside-delta circuit configuration — common for reducing line-side harmonics and allowing a smaller unit for a given motor current. External reset is supported, and a display shows fault signals for diagnostics. ## Environmental and mounting constraints Storage temperature range is -25 to +80 °C; operation is allowed up to 60 °C ambient. Maximum motor cable length is 500 m — beyond that, capacitive charging current may cause nuisance tripping or reduce the effective starting torque. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides for airflow.","metaTitle":"Siemens 3RW4436-2BC36 Soft Starter, 281 A, 690 V, SIRIUS","metaDescription":"Siemens SIRIUS 3RW4436-2BC36 soft starter, 281 A at 40 °C, 690 V insulation, 50/60 Hz. Active production. Quoted 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 (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4436-2BC36","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 145 A, 125 hp Inside-delta: 251 A, 250 hp 400-690 V AC, 115 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":"115V","at 60 Hz rated value":"115V","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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"160kW","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/6cb091ccc7549b5b632231318698a889.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=243998&mlfb=3RW4436-2BC36"},"ai":{"faq":[{"question":"What is the 3RW4436-2BC36 rated current at different temperatures?","answer":"At 40 °C the rated current is 281 A. These are the continuous current limits; starting current can be set via the adjustable current limitation feature."},{"question":"What wire sizes does the 3RW4436-2BC36 accept?","answer":"Main circuit terminals accept stranded wire 25 to 120 mm² or 4 to 250 kcmil. Auxiliary terminals accept solid wire 0.25 to 1.5 mm² (24 to 16 AWG). Busbar connection is also supported for the main circuit."},{"question":"Does the 3RW4436-2BC36 include motor overload protection?","answer":"Yes, motor overload protection and intrinsic device protection are built in. The unit also has adjustable current limitation and an external reset input. A display shows fault signals for diagnostics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4436-2BC36","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/3RW4436-2BC36 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}}