{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4423-3BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4423-3BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4423-3BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4423-3BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4423-3BC45 soft starter, 62 A at 40 °C, 690 V insulation voltage, integrated bypass, inside-delta circuit, screw fixing, 270 mm depth.","salesMarkdown":"The Siemens 3RW4423-3BC45 is a SIRIUS-brand soft starter, designed to ramp motor loads up gradually rather than slamming them across the line. It carries a rated current of 62 A at 40 °C, derating to 55 A at 50 °C and 50 A at 60 °C, so the real-world capacity depends on your enclosure's internal temperature. The insulation voltage is rated 690 V, and it operates on 50 or 60 Hz supplies at 230 V control voltage. The 62 A rating at 40 °C is the headline number, but the derating curve tells the real story: at 50 °C it drops to 55 A, and at 60 °C to 50 A. If your panel runs hot, size up or plan for forced ventilation. The minimum load of 8 % means it won't reliably start a motor drawing less than about 5 A — small pumps or fans may need a different starting method. Pollution degree 3 per IEC 60947-4-2 means the unit tolerates conductive pollution and occasional condensation — typical for industrial control panels not in a climate-controlled room. The integrated bypass contact system shunts the thyristors after start, eliminating heat-sink losses during run; the inside-delta circuit allows a six-wire motor connection that reduces the starter's per-phase current draw by about 42 % compared to standard-in-line wiring. ## Where this class of part is used Soft starters like this one go into motor control centers and individual motor starters for pumps, conveyors, compressors, and fans where a reduced-voltage start protects the driven load and the supply network from mechanical shock and voltage dips. The 3RW4423-3BC45 is a panel-mount unit with screw fixing, sized for a standard enclosure backplate. Dimensions are 170 mm wide, 192 mm high, 270 mm deep. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. Main circuit connections use box terminals; the auxiliary and control circuit uses spring-loaded terminals. Stranded wire capacity on the main terminals is 2x (4 to 50 mm²).","metaTitle":"Siemens 3RW4423-3BC45 SIRIUS Soft Starter, 62A at 40°C","metaDescription":"Siemens SIRIUS 3RW4423-3BC45 soft starter, 62A rated at 40°C, 690V insulation voltage, integrated bypass, inside-delta capable. Active production, sourced 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","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","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":"22kW","at standard circuit at 50 °C rated value":"25hp","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":"37kW","at inside-delta circuit at 50 °C rated value":"50hp","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":"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":"$1,869.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=372699&mlfb=3RW4423-3BC45","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RW4423-3BC45/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum motor cable length for this soft starter?","answer":"The maximum wire length is 500 m, which is typical for this class of soft starter and sufficient for most industrial installations where the motor is within a reasonable distance of the panel."},{"question":"Does the 3RW4423-3BC45 have an integrated bypass?","answer":"Yes, it has an integrated bypass contact system that shunts the thyristors after the motor reaches full speed, eliminating heat-sink losses during continuous running."},{"question":"Can this soft starter be wired in inside-delta configuration?","answer":"Yes, it supports inside-delta circuit wiring, which reduces the per-phase current draw through the starter by roughly 42% compared to standard-in-line connection, allowing a smaller starter for a given motor current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4423-3BC45","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/3RW4423-3BC45 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}