{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4453-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4453-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4453-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4453-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4453-6BC36 soft starter, 954 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, inside-delta circuit capable, screw fixing.","salesMarkdown":"## 954 A at 40 °C — what that current rating means in the panel The 3RW4453-6BC36: The integrated bypass contact system switches the thyristors out of the circuit once the motor reaches full speed, eliminating the 1.5–2 V per-device forward drop that would otherwise waste heat continuously. For a 954 A motor, that saves roughly 1.5 kW of dissipation that would otherwise need to be vented from the enclosure. ## Inside-delta wiring and adjustable current limitation This soft starter supports inside-delta circuit configuration, which connects the thyristors in series with each motor winding rather than the supply lines. That reduces the line current the soft starter must carry to 58 % of the motor FLA — so a 954 A unit in inside-delta can control a motor drawing roughly 1645 A line current, effectively extending the range without stepping to a larger frame. Adjustable current limitation lets you set the starting torque profile from 8 % minimum load up to the unit's full rating. The minimum load of 8 % means it can soft-start near-unloaded machines like centrifugal pumps or fans without the current spike that would trip a fixed-torque starter. Motor overload protection and intrinsic device protection are both onboard — the soft starter monitors motor current and its own thyristor temperature, so no separate overload relay is needed in the power circuit. The display for fault signals shows the trip cause directly on the unit. Mounting is by screw fixing — no DIN rail clip. The unit measures 510 mm wide × 640 mm high × 290 mm deep, so it needs a backplate area roughly the size of a sheet of A3 paper plus clearance. The mounting position allows vertical surface mounting with ±90° rotation and ±22.5° tilt forward/back, which helps fit into existing enclosures with odd panel orientations. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides. The 5 mm side gap is tight — adjacent devices or cable ducts must not block the ventilation slots. Main circuit connections accept busbar or cable from 2/0 to 500 kcmil; control wiring uses screw terminals for 20–14 AWG. Maximum motor cable length is 500 m — beyond that, reflected wave voltages at the motor terminals can exceed the winding insulation rating, especially on 480 V systems. The unit operates at 50 or 60 Hz with a control supply of 115 V at both frequencies.","metaTitle":"Siemens 3RW4453-6BC36 SIRIUS Soft Starter, 954 A, 690 V","metaDescription":"Siemens 3RW4453-6BC36 SIRIUS soft starter, 954 A at 40 °C, 690 V insulation voltage, integrated bypass. Active production, quoted to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"510mm","title":"3RW4453-6BC36","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 494 A, 500 hp Inside-delta: 856 A, 950 hp 400-690 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5548-6HA16<<","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":"115V","at 60 Hz rated value":"115V","at 40 °C rated value":"954A","at 50 °C rated value":"856A","at 60 °C rated value":"759A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Insulation Voltage Rated Value":"690V","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":"355kW","at standard circuit at 50 °C rated value":"500hp","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":"630kW","at inside-delta circuit at 50 °C rated value":"950hp","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":"560kW","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%","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":"159W","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":"110A","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/76ef188b7e26e7f9f22ab0e5af286b1c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=104464&mlfb=3RW4453-6BC36"},"ai":{"faq":[{"question":"Does 3RW4453-6BC36 include a bypass contactor?","answer":"Yes, the integrated bypass contact system is built in. Once the motor reaches full speed, the thyristors are shorted out, eliminating continuous conduction losses. No external bypass contactor is needed."},{"question":"What compliance documentation does Siemens provide for 3RW4453-6BC36?","answer":"The unit carries degree of pollution 3 per IEC 60947-4-2 and is designed for 690 V insulation voltage. Standard Siemens documentation includes the CE declaration of conformity, UKCA marking, and the product manual with wiring diagrams. Specific RoHS/REACH declarations are available from Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4453-6BC36","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/3RW4453-6BC36 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}}