{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4423-1BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4423-1BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4423-1BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4423-1BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW4423-1BC45, 62 A at 40 °C, 230 V AC 50/60 Hz, integrated bypass, screw fixing, 170 x 192 x 270 mm.","salesMarkdown":"## What this soft starter delivers The Siemens SIRIUS 3RW4423-1BC45 is a soft starter rated 62 A at 40 °C, with a 230 V control supply at 50/60 Hz. It includes an integrated bypass contact system, so the thyristors are shorted out once the motor is up to speed — that drops heat dissipation in the panel and extends the life of the semiconductor stack. That gives flexibility in panel layout, but the derating curve needs attention: at 50 °C the continuous current drops to 55 A, and at 60 °C it falls to 50 A. If your motor full-load amps sit near 62 A, you need to keep ambient below 40 °C or step up a frame size. ## Wiring and connections Main current circuit uses box terminals accepting 2x (4... 50 mm²) stranded. The auxiliary and control circuit uses screw-type terminals for 2x (0.5... 2.5 mm²) solid. Maximum wire length to the motor is 500 m — beyond that you risk voltage drop on the soft-starter output during the ramp. The unit supports inside-delta circuit wiring, which lets you connect the soft starter inside the motor's delta winding. That reduces the current through the thyristors to 58% of line current, effectively giving you a higher motor rating from the same frame. Minimum load is 8% of the rated current, so it handles small motors without nuisance tripping. ## Protection and control features Motor overload protection is built in, along with intrinsic device protection. Adjustable current limitation lets you set the start current between the minimum and the unit's rated maximum. An external reset input is provided, and fault signals show on the integrated display — no separate HMI needed for diagnostics.","metaTitle":"Siemens 3RW4423-1BC45 SIRIUS Soft Starter, 62A, 230V, Integr","metaDescription":"Siemens SIRIUS 3RW4423-1BC45 soft starter, 62A at 40°C, 230V 50/60Hz. Integrated bypass, inside-delta capable, screw fixing. 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 (0.5 ... 2.5 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 (20 ... 14)","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":"screw-type 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 (0.5 ... 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%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","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=432009&mlfb=3RW4423-1BC45","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RW4423-1BC45/alternatives.json"},"ai":{"faq":[{"question":"What are the key current ratings at different temperatures?","answer":"Rated 62 A at 40 °C, derated to 55 A at 50 °C, and 50 A at 60 °C. The derating temperature threshold is 40 °C, so the full 62 A is only available below that ambient."},{"question":"Does this soft starter include an internal bypass?","answer":"Yes, it has an integrated bypass contact system. Once the motor reaches full speed, the thyristors are bypassed, eliminating heat generation from the semiconductors during continuous running."},{"question":"What are the physical dimensions and mounting requirements?","answer":"Width 170 mm, height 192 mm, depth 270 mm. It uses screw fixing on a vertical surface, with ±90° rotation and ±22.5° tilt allowed. Clearance: 100 mm upward, 75 mm downward, 5 mm at the sides."},{"question":"Can this unit be wired in an inside-delta configuration?","answer":"Yes, inside-delta circuit is supported. This reduces the current through the soft starter to approximately 58% of the line current, allowing it to start a larger motor than its line-rated current would suggest."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4423-1BC45","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/3RW4423-1BC45 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}}