{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4423-3BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4423-3BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4423-3BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4423-3BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4423-3BC44 soft starter, 62 A at 40 °C, 230 V, 50/60 Hz, 3-phase, integrated bypass, box terminal main circuit, spring-loaded auxiliary terminals, screw fixing, 270 mm depth.","salesMarkdown":"## 62 A at 40 °C — what it means for the motor branch The 3RW4423-3BC44: That 62 A figure is the continuous current in the bypass-closed state — the integrated bypass contactor carries the load after start, so the thyristor stack only sees starting current. For a 30 kW motor at 230 V (roughly 85 A FLA), this unit is undersized; it fits motors up to about 22 kW at 230 V where FLA lands near 60 A. The adjustable current limitation lets you cap starting current between 100% and about 400% of the motor FLA — useful for soft-starting conveyors or pumps that can't take a full-voltage jolt. Minimum load is 8%, so lightly loaded machines still get controlled acceleration without the unit dropping out. ## Panel fit and wiring — what the dimensions and terminals tell you At 270 mm deep, 170 mm wide, and 192 mm tall, this soft starter needs a back-panel clearance of 100 mm above and 75 mm below for airflow — the thyristor heat sink dumps about 30 W at rated current, so don't box it in. Side clearance is only 5 mm, so you can pack units tight horizontally. Screw fixing means four M5 bolts into the backplate — no DIN-rail clip. Main circuit uses box terminals accepting stranded 2x (4...50 mm²) — that's up to 1/0 AWG. The mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front-to-back, so you can orient it for cable entry without fighting the gland plate. ## Lifecycle and sourcing — still an active catalog line No stock-holding claim here; sourced per RFQ from authorized industrial distribution. ## Protection and diagnostics — what's built in Motor overload protection is integrated — no separate thermal relay or electronic overload in the branch. The unit also has intrinsic device protection that monitors thyristor junction temperature and over-current, so a stalled rotor or phase imbalance won't take out the power stack. A display shows fault codes — no programmer needed to read the last trip cause. External reset input lets you clear faults remotely from a PLC or a pushbutton on the panel door, which saves a trip to the cabinet on a nuisance trip.","metaTitle":"Siemens 3RW4423-3BC44 SIRIUS Soft Starter, 62 A, 230 V","metaDescription":"Siemens 3RW4423-3BC44 SIRIUS soft starter, 62 A at 40 °C, 230 V, 50/60 Hz. Active production.","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":"3RW4423-3BC44","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 36 A, 18.5 kW Inside-delta: 62 A, 30 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5517-3HA14<<","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":"62A","at 50 °C rated value":"55A","at 60 °C rated value":"50A","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":"18.5kW","at standard circuit at 50 °C rated value":"20hp","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":"30kW","at inside-delta circuit at 50 °C rated value":"40hp","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":"10W","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":"7A","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":"$2,541.27","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/32569206b7534ff2ac9a6f13d4293525.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=329688&mlfb=3RW4423-3BC44"},"ai":{"faq":[{"question":"What is the 3RW4423-3BC44 used for?","answer":"It's a SIRIUS soft starter for three-phase induction motors up to about 22 kW at 230 V, 50/60 Hz. It provides controlled acceleration with adjustable current limitation and includes integrated motor overload protection and an internal bypass contactor that eliminates thyristor losses during run mode. Typical applications include conveyors, pumps, fans, and compressors where reduced starting current and mechanical shock prevention are needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4423-3BC44","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/3RW4423-3BC44 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}}