{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-6BC36 soft starter, 1351 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, inside-delta circuit, screw-type terminals for control, busbar connection for main circuit.","salesMarkdown":"## Rated current and thermal derating — sizing against the motor FLA The 3RW4456-6BC36: The headline rating is 1351 A at 40 °C ambient. That is the continuous current the soft starter can carry in a 40 °C panel environment — match it to the motor full-load amps at the same ambient. Above 40 °C, the unit derates: 1200 A at 50 °C and 1065 A at 60 °C. If the panel ambient runs hotter than 40 °C, size up or provide forced ventilation to stay within the thermal envelope. The insulation voltage is rated 690 V, covering standard 400 V and 480 V line supplies with margin. Operating frequency is 50/60 Hz, so it works on either mains standard without derating. ## Integrated bypass and inside-delta — wiring and panel space An integrated bypass contact system means the soft starter's thyristors are shorted out once the motor reaches full speed. Inside-delta circuit capability allows the soft starter to be connected inside the delta winding of a delta-wound motor. This reduces the line current drawn by the starter to about 58% of the motor FLA — useful when the supply transformer or upstream breaker is marginal. The main circuit connection uses busbar; the auxiliary and control circuit uses screw-type terminals. ## Mounting and enclosure fit The unit measures 510 mm wide × 640 mm high × 290 mm deep. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. These are the minimum air gaps for cooling airflow; tighter spacing forces derating. ## Protection and control features Built-in motor overload protection and intrinsic device protection cover the thyristors and the motor — no separate overload relay is required in the BOM. Adjustable current limitation sets the starting current peak, typically between 1.5× and 4× FLA, to limit mechanical shock to the driven load. Minimum load is 8% — the starter can handle lightly loaded motors or soft-start applications where the load is decoupled at start. An external reset input and a display for fault signals are provided. Maximum motor cable length is 500 m — beyond that, capacitive charging current from the cable may interfere with the thyristor gate firing; keep runs shorter or add an output reactor.","metaTitle":"Siemens 3RW4456-6BC36 SIRIUS Soft Starter, 1351 A, 40 °C","metaDescription":"Siemens 3RW4456-6BC36 SIRIUS soft starter, 1351 A at 40 °C, 690 V insulation, integrated bypass, inside-delta capable. Active production, quoted to order.","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":"3RW4456-6BC36","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: 693 A, 750 hp Inside-delta: 1200 A, 1350 hp 400-690 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5554-6HA16<<","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":"1 351A","at 50 °C rated value":"1 200A","at 60 °C rated value":"1 065A","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":"560kW","at standard circuit at 50 °C rated value":"750hp","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":"900kW","at inside-delta circuit at 50 °C rated value":"1 350hp","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":"800kW","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":"214W","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":"156A","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/7c38b59b8347cd184e45c13f446ad37d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=534666&mlfb=3RW4456-6BC36"},"ai":{"faq":[{"question":"What is the maximum cable length for 3RW4456-6BC36?","answer":"The maximum motor cable length is 500 m. Beyond that, cable capacitance can cause false thyristor firing; for longer runs, consider an output reactor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-6BC36","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/3RW4456-6BC36 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}}