{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC46 soft starter, 1351 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, screw fixing, 640 x 510 x 290 mm.","salesMarkdown":"## Headline rating — 1351 A at 40 °C, what it means for motor sizing The 3RW4456-2BC46: The 1351 A at 40 °C is the continuous current rating in standard ambient. For a 690 V insulation class motor at 400 V, that translates to roughly 900 kW — but the actual motor FLC determines the soft starter frame, not the other way around. Derate to 1200 A at 50 °C and 1065 A at 60 °C if the cabinet ambient runs hot; the derating starts above 40 °C. The minimum load is 8% of the rated current — so it won't regulate down to a fractional-horsepower motor. Keep that in mind if the application is a small pump on the same line. ## Integrated bypass — one less contactor to stock The integrated bypass contact system means the soft starter's thyristors are shorted out once the motor is up to speed. That's one less external bypass contactor to buy, wire, and shelf-spare. The bypass also cuts heat dissipation in the cabinet during run — the thyristors only carry current during the start ramp. Inside-delta circuit wiring is supported — if the motor is delta-connected and you wire the soft starter in the delta legs, the per-phase current through the unit is roughly 58% of the line current. That can let you downsize the soft starter frame for the same motor, but the wiring gets more involved. ## Mounting and panel fit — screw-fixed, not DIN-rail Clearance: 100 mm above, 75 mm below, 5 mm at the sides. The side clearance is tight — adjacent devices or cable ducts need to respect that for cooling airflow. Main circuit cables: stranded 70-240 mm² or finely stranded 50-240 mm². For North American wire sizes, that's 2/0 to 500 kcmil. The auxiliary and control circuit terminals are spring-loaded, accepting 0.25-1.5 mm² solid or 24-16 AWG. No screw torque to check on the control wiring. ## Protection and diagnostics — onboard display, adjustable current limit Motor overload protection and intrinsic device protection are built in — the soft starter monitors its own thyristor temperature and the motor current. The adjustable current limitation lets you set the start current between 100% and, presumably, some lower percentage (the spec doesn't give the ceiling, but typical SIRIUS units go to about 400% of FLC). Fault signals show on the onboard display — no need to wire a separate HMI for basic diagnostics. External reset is available for remote clearing after a trip. The motor brake output is a product component — if the application has a DC brake, the soft starter can control it directly. Wire length maximum is 500 m from the unit to the motor; beyond that, voltage drop and reflected wave issues start to matter. Sourced through independent distribution against an RFQ. The SIRIUS brand is Siemens' standard industrial soft starter line, widely specified and cross-referenced.","metaTitle":"Siemens 3RW4456-2BC46 Soft Starter, 1351A at 40°C, SIRIUS","metaDescription":"Siemens SIRIUS 3RW4456-2BC46 soft starter, 1351A rated at 40°C, 690V insulation, integrated bypass. Active production, quoted to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"510mm","title":"3RW4456-2BC46","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 780 A, 800 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5554-2HA16<<","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":"230V","at 60 Hz rated value":"230V","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 (24 ... 16)","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":"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":"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%","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/d715b22cf3c3a398be2dfd211eca0ca4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=30113&mlfb=3RW4456-2BC46"},"ai":{"faq":[{"question":"Does 3RW4456-2BC46 need an external bypass contactor?","answer":"No — it has an integrated bypass contact system that shorts the thyristors once the motor is at speed. No external bypass contactor is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC46","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/3RW4456-2BC46 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}}