{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4424-3BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4424-3BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4424-3BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4424-3BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4424-3BC46 soft starter, 81 A at 40 °C, 230 V AC, 50/60 Hz, inside-delta circuit, integrated bypass, spring-loaded terminals.","salesMarkdown":"## 81 A at 40 °C — the derating curve sets your panel budget The 3RW4424-3BC46: That 21 % drop from 40 to 60 °C means the panel ventilation and adjacent heat sources directly govern whether this starter holds its full current rating in your enclosure. Inside-delta wiring reduces the current through each thyristor leg to 58 % of the line current — so this 81 A unit can start a motor with a nominal FLA well above 81 A when wired inside-delta. Confirm the motor winding configuration before specifying; the starter supports both standard and inside-delta connections. Integrated bypass contact system eliminates the need for an external bypass contactor — the bypass closes after the start ramp, shunting the thyristors and dropping the heat load to near zero during run. This saves panel space and wiring compared to a starter-plus-bypass combination. ## Mounting, wiring, and clearance — what fits in the panel Dimensions are 270 mm deep, 170 mm wide, 192 mm high — a compact footprint for the 81 A rating. Screw fixing to the mounting plate; the unit can be rotated ±90° on a vertical surface and tilted ±22.5° front-to-back, giving flexibility in tight enclosures. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. The top clearance is the critical one — it allows hot air from the thyristor heatsink to rise without recirculating. Skimping on the 100 mm overhead will force derating beyond the published curve. Main current circuit uses box terminals accepting 2x (4 … 50 mm²) stranded or 2x (10 … 1/0) AWG. ## Protection and diagnostics — built-in, no add-ons Motor overload protection and intrinsic device protection (thyristor overtemperature, phase imbalance, stalled rotor) are integrated. No external overload relay or motor protection circuit breaker is required for the starter itself — the 3RW44 series handles it internally. Adjustable current limitation lets you set the start current anywhere from 0 to the rated value — useful for soft-starting conveyors or pumps where a hard limit on inrush protects downstream mechanicals. Minimum load is 8 % of rated current, so it can start lightly loaded motors without dropping out. Fault signal is displayed on the unit itself — a local display shows the fault code, which speeds troubleshooting on the floor without needing a laptop. External reset input allows remote clearing from a PLC or pushbutton station. ## Environmental and electrical ratings — industrial duty Pollution degree 3 per IEC 60947-4-2 — the standard for industrial environments where conductive dust or condensation can occur. Insulation voltage rated 690 V, giving headroom on 400/480 V systems. Operating frequency 50 … 60 Hz — one unit covers both line frequencies. Storage temperature range -25 … +80 °C, operation up to 60 °C ambient. Maximum motor cable length 500 m — long enough for most pump and conveyor runs without output reactors.","metaTitle":"Siemens 3RW4424-3BC46 Soft Starter, 81 A, 230 V, SIRIUS","metaDescription":"Siemens 3RW4424-3BC46 SIRIUS soft starter, 81 A at 40 °C, 230 V, 50/60 Hz. Integrated bypass, inside-delta circuit, motor overload protection.","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":"3RW4424-3BC46","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 47 A, 45 kW Inside-delta: only up to 600 V 400-690 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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"45kW","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/4255ff182c71db9ea987b4b7ffa3003c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=404284&mlfb=3RW4424-3BC46"},"ai":{"faq":[{"question":"What is the inside-delta circuit and why does it matter?","answer":"Inside-delta wiring connects the soft starter in series with each motor winding rather than in the line. This reduces the current through each thyristor to 58 % of the line current, so the 81 A unit can start a motor with a higher FLA when wired inside-delta. Confirm the motor winding configuration before specifying."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4424-3BC46","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/3RW4424-3BC46 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}}