{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4424-1BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4424-1BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4424-1BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4424-1BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4424-1BC36 soft starter, thyristor-based, 81 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass contactor, screw fixing.","salesMarkdown":"## Thyristor-based soft starter, 81 A at 40 °C — the thermal budget decides the real current The 3RW4424-1BC36 is a SIRIUS soft starter using thyristors for voltage ramp starting — the core switching element handles the inrush without mechanical wear on the main contacts. An integrated bypass contactor closes after the start ramp, taking the thyristors out of the circuit during run mode — this cuts heat dissipation and lets the soft starter handle continuous loads without oversized heatsinks. Motor overload protection is built in, and the unit also provides intrinsic device protection against overtemperature — no separate overload relay or thermistor relay is needed for the starter itself. ## Panel fit and wiring — screw fixing, box terminals, 270 mm depth Mounting is by screw fixing (not DIN rail snap-on), with the unit sized 170 mm wide, 192 mm high, and 270 mm deep — the depth is the dimension to check when the enclosure back-panel clearance is tight. The mounting position allows vertical surface mounting with ±90° rotation and ±22.5° tilt forward/backward, so the panel layout can tilt the unit without derating. Main circuit connections use box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0 AWG) using both clamping points. Clearance around the unit: 100 mm above, 75 mm below, 5 mm at the sides. Maximum motor cable length is 500 m — sufficient for most industrial motor runs, but long cable installations should check for reflected wave effects on the thyristor stack. ## Inside-delta wiring and adjustable current limit — application flexibility The soft starter supports inside-delta circuit wiring, which connects the thyristors in the delta legs of a six-wire motor. This reduces the current through each thyristor to 58 % of the line current, allowing the 81 A unit to start motors with a higher nominal current in delta configuration. Adjustable current limitation lets the user set the maximum start current as a multiple of the motor FLA — useful for applications where the supply transformer or generator has limited short-term capacity. Minimum load is 8 %, so the starter can handle lightly loaded motors without instability. Pollution degree 3 per IEC 60947-4-2 means it is rated for industrial environments with conductive dust or occasional condensation. ## Fault display and external reset — local and remote diagnostics A display on the unit shows fault codes locally — no HMI or software needed for first-level diagnostics. An external reset input allows remote clearing of faults from a PLC or pushbutton panel, which is standard for automated restart sequences.","metaTitle":"Siemens 3RW4424-1BC36 SIRIUS Soft Starter, 81 A, 690 V","metaDescription":"Siemens 3RW4424-1BC36 SIRIUS soft starter, 81 A at 40 °C, 690 V insulation, thyristor-based with integrated bypass. 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 (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4424-1BC36","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 42 A, 30 hp Inside-delta: 73 A, 60 hp 400-690 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5524-1HA16<<","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":"115V","at 60 Hz rated value":"115V","at 40 °C rated value":"81A","at 50 °C rated value":"73A","at 60 °C rated value":"64A","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":"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%","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":"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/a1b5110e1bb711dc2ef26a9b88b476e4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=508935&mlfb=3RW4424-1BC36"},"ai":{"faq":[{"question":"What is the maximum current at 60 °C ambient for the 3RW4424-1BC36?","answer":"At 60 °C ambient the rated current is 64 A, down from 81 A at 40 °C. The derating curve is linear between those points — at 50 °C it is 73 A."},{"question":"Does the 3RW4424-1BC36 include a bypass contactor?","answer":"Yes, it has an integrated bypass contactor that closes after the start ramp, taking the thyristors out of the circuit during run mode to reduce heat dissipation."},{"question":"What wiring options does the 3RW4424-1BC36 support for the motor?","answer":"It supports standard three-wire starting and inside-delta circuit wiring for six-wire motors. The inside-delta connection reduces the current through each thyristor to 58 % of the line current."},{"question":"How is the 3RW4424-1BC36 mounted and what are the clearance requirements?","answer":"It uses screw fixing (not DIN rail). Clearance around the unit: 100 mm above, 75 mm below, 5 mm at the sides. The mounting surface can be vertical with ±90° rotation and ±22.5° tilt."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4424-1BC36","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/3RW4424-1BC36 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}}