{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4424-3BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4424-3BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4424-3BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4424-3BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4424-3BC45 soft starter, 81 A at 40 °C, 690 V insulation voltage, 50/60 Hz, 3-phase, integrated bypass contact system, inside-delta circuit, adjustable current limitation, motor overload protection, spring-loaded auxiliary/control terminals, box terminal main circuit, screw fixing, IP20, 270 x 170 x 192 mm (D x W x H).","salesMarkdown":"## Active production — what that means for your BOM line The 3RW4424-3BC45: It belongs to the SIRIUS family, Siemens' modular platform for motor management and soft starting, which means panel builders and OEMs can rely on consistent accessory compatibility (bypass contactors, overload relays, communication modules) across the range. ## Current rating and thermal derating — the real-world limit The derating temperature is 40 °C — above that, the continuous output current drops linearly. If your panel ambient runs at 50 °C, the usable current is 73 A, not the headline 81 A. The insulation voltage is rated 690 V, and the operating frequency covers 50 to 60 Hz, so it fits standard global line voltages without a hardware change. ## Integrated bypass and inside-delta — what they save you An integrated bypass contact system means the soft starter's thyristors are shorted out after the motor reaches full speed, eliminating continuous conduction losses and the need for an external bypass contactor. This reduces heat in the panel and improves system efficiency. Inside-delta wiring capability allows the soft starter to be connected in the motor's delta loop, reducing the current through each device leg to 58% of the line current. This lets a smaller-frame soft starter handle a given motor — a cost and space advantage in high-current applications. ## Protection and adjustment — motor overload and current limit Built-in motor overload protection (electronic, adjustable) and intrinsic device protection (over-temperature, phase imbalance, thyristor fault) eliminate the need for a separate overload relay in most installations. The adjustable current limitation lets you set the starting current between 8% and 100% of the soft starter's rated current, matching the motor's acceleration profile. The minimum load of 8% means it can start lightly loaded motors without nuisance tripping — useful for pumps running dry or conveyors with minimal friction at start. ## Mounting, wiring, and environmental fit Screw fixing to a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front-to-back — this gives flexibility in panel layout, but the clearance requirements are strict: 100 mm above, 75 mm below, 5 mm at the sides for airflow and service access. Main circuit uses box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0 AWG) using both clamping points. The maximum wire length to the motor is 500 m — beyond that, voltage drop and cable capacitance may affect the thyristor commutation. Degree of pollution 3 per IEC 60947-4-2, operating temperature up to 60 °C, storage from -25 to +80 °C — suitable for industrial environments with conductive dust or humidity, not for clean-room or outdoor exposure without additional enclosure. ## Fault indication and reset — service-friendly A display for fault signal shows the last fault code, speeding diagnosis. External reset input allows remote clearing of faults from a PLC or pushbutton panel — no need to open the enclosure door.","metaTitle":"Siemens 3RW4424-3BC45 SIRIUS Soft Starter, 81 A, 690 V","metaDescription":"Siemens 3RW4424-3BC45 SIRIUS soft starter, 81 A at 40 °C, 690 V insulation, 50/60 Hz. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4424-3BC45","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 47 A, 30 kW Inside-delta: 81 A, 45 kW 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5524-3HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","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":"81A","at 50 °C rated value":"73A","at 60 °C rated value":"64A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"box terminal","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (10 ... 1/0)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"10 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"10 ... 2/0","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":"30kW","at standard circuit at 50 °C rated value":"30hp","Finely Stranded Without Core End Processing":"2x (4 ... 35 mm²)","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":"45kW","at inside-delta circuit at 50 °C rated value":"60hp","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":"32W","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":"9A","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/3907a6527c3e86911e4c87cd816b1ba5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=522630&mlfb=3RW4424-3BC45"},"ai":{"faq":[{"question":"What is the rated current of 3RW4424-3BC45 at different ambient temperatures?","answer":"At 40 °C ambient the continuous rated current is 81 A. It derates to 73 A at 50 °C and to 64 A at 60 °C. The derating starts above 40 °C, so panel temperature must be considered when sizing for full motor current."},{"question":"Does 3RW4424-3BC45 include an integrated bypass contactor?","answer":"Yes, it has an integrated bypass contact system that shorts the thyristors after start, eliminating continuous conduction losses and the need for an external bypass contactor."},{"question":"What is the inside-delta wiring capability of 3RW4424-3BC45?","answer":"It supports inside-delta circuit connection, which reduces the current through each soft starter leg to 58% of the line current. This allows a smaller unit to handle a given motor, saving panel space and cost."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4424-3BC45","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/3RW4424-3BC45 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}}