{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC35 soft starter, 1351 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta capable, pollution degree 3, screw fixing.","salesMarkdown":"## What the 1351A rating means in your enclosure The 3RW4456-2BC35: Insulation voltage rated 690 V gives headroom on 400/480/575 V systems, and the 50/60 Hz operating frequency means one unit covers both line frequencies globally. ## Inside-delta wiring and bypass — what they save you Inside-delta circuit capability lets you wire the thyristors inside the motor delta winding, reducing the current the soft starter must handle to 58% of the line-fed rating — a 1351 A line-rated starter covers a motor that would otherwise need a 2300 A unit in line configuration. Integrated bypass contact system means the thyristors are shorted out once the motor is at full speed — no external bypass contactor to buy, wire, or lose space for, and the heat load in the panel drops to the bypass contact resistance instead of the thyristor forward voltage drop. ## Mounting, clearances, and wiring — what fits in the panel Clearance requirements: 100 mm above for cable entry and airflow, 75 mm below, and only 5 mm at the sides — the side clearance is tight enough that adjacent units can be mounted side-by-side without a gap, but the vertical space is mandatory for the busbar connections and natural convection. Main circuit wiring accepts stranded 70-240 mm² or finely stranded 50-240 mm², or busbar connection — the busbar option is the cleanest for the 1351 A range, avoiding the bending radius and lug stack-up of parallel cables. Auxiliary and control circuit terminals are spring-loaded, accepting solid 0.25-1.5 mm² — tool-less insertion for PLC and relay signals, and the spring clamp holds under vibration better than screw terminals. ## Protection layers and diagnostics Motor overload protection, intrinsic device protection, and adjustable current limitation are all built in — the soft starter can replace a separate overload relay for most applications, and the current limit setting lets you cap inrush to protect driven machinery. Pollution degree 3 per IEC 60947-4-2 certifies the unit for industrial environments with conductive dust or occasional condensation — the creepage distances and enclosure sealing are designed for that severity level. A display for fault signals gives local diagnostic readout without a separate HMI or laptop — the first thing a technician looks at when the starter trips on a phase imbalance or over-temperature event. Motor brake output integrated means a brake motor can be controlled directly from the soft starter without a separate brake contactor — saves a panel component and the wiring between them.","metaTitle":"Siemens 3RW4456-2BC35 SIRIUS Soft Starter, 1351A at 40°C","metaDescription":"Siemens 3RW4456-2BC35 SIRIUS soft starter, rated 1351A at 40°C, 690V insulation voltage. Active production.","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":"3RW4456-2BC35","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 400-600 V AC, 115 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":"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":"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 ... 600V","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/7e7235665334696aec10e51039f3b0b7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=412716&mlfb=3RW4456-2BC35"},"ai":{"faq":[{"question":"What is the maximum motor cable length for the 3RW4456-2BC35?","answer":"The maximum wire length is 500 m — beyond that, reflected wave voltage spikes at the motor terminals can exceed the winding insulation rating, especially on 480/575 V systems."},{"question":"Does the 3RW4456-2BC35 include a bypass contactor?","answer":"Yes, the integrated bypass contact system shorts the thyristors in run mode — no external bypass contactor is needed, and the heat dissipation drops to the contact resistance level instead of the thyristor forward drop."},{"question":"What compliance documentation does Siemens provide for the 3RW4456-2BC35?","answer":"The unit is certified to IEC 60947-4-2 for pollution degree 3, and carries the SIRIUS brand with full RoHS, REACH, and CE declarations available from Siemens — the declaration of conformity covers the 690 V insulation voltage and 50/60 Hz operating frequency."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC35","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/3RW4456-2BC35 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}}