{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC34 soft starter, 1351 A at 40°C, 690 V insulation, 640×510×290 mm, screw fixing, integrated bypass contact system, inside-delta circuit.","salesMarkdown":"## 1351 A frame — what the derating curve means for your panel The 3RW4456-2BC34 is rated 1351 A at 40°C, derating to 1200 A at 50°C and 1065 A at 60°C. In a non-conditioned enclosure hitting 50°C ambient, budget for 1200 A continuous — the 1351 A number is only valid at or below 40°C. For a 1351 A bypass contactor, that's a significant panel cost and space reduction. Inside-delta circuit capability reduces motor cable current to 58% of line current — for a 1351 A motor, the cable between soft starter and motor carries ~783 A instead of the full 1351 A, allowing smaller cable or longer runs. ## Mounting and clearances — screw-fixed, not DIN-rail Mounting position allows ±90° rotation and ±22.5° tilt, useful for tight cabinets or angled backplates. Clearance requirements: 100 mm above, 75 mm below, only 5 mm at the sides — the tight side clearance helps pack multiple units side-by-side. Main current circuit connection is busbar — expect flat copper bars, not cable lugs, in the panel layout. Auxiliary and control circuit terminals are spring-loaded, accepting solid 0.25-1.5 mm² or stranded 70-240 mm² for mains. For North American installs, main terminals also accept 2/0-500 kcmil. ## Protection and control — integrated overload, brake output, diagnostics Motor overload protection and intrinsic device protection are built in — no separate thermal relay or motor protection circuit breaker needed. Adjustable current limitation lets you set the starting torque profile to match the load, from 8% minimum load up to the rated current. A motor brake output is integrated — for hoist, incline, or fast-stop applications, the soft starter controls the brake directly without an external brake relay. Fault signals appear on the onboard display, reducing troubleshooting time. Maximum motor cable length is 500 m — sufficient for most plant layouts. Operating ambient up to 60°C with storage range -25 to +80°C covers non-conditioned plant floors. ## Lifecycle and sourcing — current production, quoted to order Sourced through independent distribution channels. No stock-holding claim; quoted per inquiry.","metaTitle":"Siemens 3RW4456-2BC34 SIRIUS Soft Starter, 1351 A at 40°C","metaDescription":"Siemens 3RW4456-2BC34 SIRIUS soft starter, rated 1351 A at 40°C with integrated bypass and inside-delta circuit. Current production — quoted to order via RFQ.","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":"3RW4456-2BC34","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 693 A, 600 hp Inside-delta: 1200 A, 1050 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5554-2HA14<<","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 (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":"450kW","at standard circuit at 50 °C rated value":"600hp","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":"800kW","at inside-delta circuit at 50 °C rated value":"1 050hp","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":"200 ... 460V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","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/bc3638abb2831c865dd007f5a359c279.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=281181&mlfb=3RW4456-2BC34"},"ai":{"faq":[{"question":"What is the closest alternative to 3RW4456-2BC34 in the SIRIUS family?","answer":"No official pin-compatible alternative or successor is recorded for this order code. The 3RW4456-2BC34 occupies a specific current rating (1351 A at 40°C) and form factor within the SIRIUS soft starter range; a different current class would require a different frame size and mounting footprint."},{"question":"What compliance documentation does Siemens provide for 3RW4456-2BC34?","answer":"The unit is designed to IEC 60947-4-2 (pollution degree 3) and carries the SIRIUS brand. Specific RoHS, REACH, UL, and CE declarations are available from Siemens documentation; no separate cert numbers are listed in the spec record."},{"question":"What does the inside-delta circuit feature do on this soft starter?","answer":"Inside-delta connection reduces the current through the motor cables to 58% of the line current. For a 1351 A motor, that means the soft starter sees ~783 A per phase on the motor side, allowing smaller cable cross-sections or longer cable runs between the soft starter and the motor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC34","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/3RW4456-2BC34 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}}