{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4426-3BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4426-3BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4426-3BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4426-3BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW44 soft starter, 3RW4426-3BC34, 133 A at 40°C, 690 V insulation voltage, 50/60 Hz, integrated bypass contactor, screw fixing.","salesMarkdown":"## Current derating drives the real-world rating The 3RW4426-3BC34: For a panel with a 50°C internal ambient — common in enclosed drives — the usable continuous current is 118 A, not the headline figure. The 690 V rated insulation voltage and 50/60 Hz operating frequency cover standard global supply voltages without a voltage derating step. ## Inside-delta wiring cuts line current by 42% This soft starter supports inside-delta circuit configuration, which reduces the current through the thyristors to 58% of the motor full-load current. For a 133 A motor, the line-side contactor and cabling see only about 77 A — allowing smaller upstream components. The integrated bypass contactor then closes at full speed, removing the thyristors from the circuit and eliminating their heat dissipation during run. ## Pollution degree 3 and clearance planning Rated pollution degree 3 per IEC 60947-4-2, this soft starter is designed for industrial environments where conductive dust or occasional condensation occurs. The required clearances are 100 mm above, 75 mm below, and 5 mm at the sides — the vertical clearance is the binding constraint in a shallow enclosure. ## Integrated protection eliminates external overload relay Motor overload protection is built in, removing the need for a separate thermal or electronic overload relay in the motor circuit. Intrinsic device protection monitors thyristor temperature and overcurrent — a fault display on the unit gives local diagnostics without a connected HMI. The adjustable current limitation lets you set the start current between 8% and 100% of the soft starter rating, which also serves as a torque limiter for delicate loads. ## Termination: spring-loaded control, box-terminal power The main current circuit uses box terminals accepting 2x (4 to 50 mm²) stranded, with front and back clamping points both rated for 10 AWG to 2/0 AWG. Maximum motor cable length is 500 m, sufficient for remote motor installations without a drive-end reactor.","metaTitle":"Siemens 3RW4426-3BC34 SIRIUS Soft Starter, 133 A at 40°C","metaDescription":"Siemens 3RW4426-3BC34 SIRIUS soft starter, 133 A at 40°C, 690 V insulation, integrated bypass. Active production, quoted to order. Request RFQ.","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":"3RW4426-3BC34","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 68 A, 50 hp Inside-delta: 118 A, 75 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5526-3HA14<<","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":"115V","at 60 Hz rated value":"115V","at 40 °C rated value":"133A","at 50 °C rated value":"118A","at 60 °C rated value":"102A","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":"37kW","at standard circuit at 50 °C rated value":"50hp","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":"75kW","at inside-delta circuit at 50 °C rated value":"75hp","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":"45W","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":"15A","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/8ee4196bc4ac5d8af14c4d6b05d2885a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=172353&mlfb=3RW4426-3BC34"},"ai":{"faq":[{"question":"Where can I buy the 3RW4426-3BC34 and get a price?","answer":"Submit a request with your target quantity and delivery window for current pricing and lead time confirmation."},{"question":"What compliance documentation does Siemens provide for the 3RW4426-3BC34?","answer":"The soft starter carries pollution degree 3 certification per IEC 60947-4-2. Standard Siemens documentation includes the declaration of conformity for CE marking; UL and CSA listings are typical for the SIRIUS 3RW44 series but should be confirmed against the specific variant at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4426-3BC34","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/3RW4426-3BC34 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}