{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4026-1BB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4026-1BB05","canonicalUrl":"https://aoctrl.com/siemens/3RW4026-1BB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4026-1BB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4026-1BB05 soft starter, Size S0, 25 A at 40 °C, 50-60 Hz, 24 V control, screw terminals, integrated bypass, active production.","salesMarkdown":"## SIRIUS 3RW4026-1BB05 — 25 A soft starter with integrated bypass The unit includes motor overload protection and intrinsic device protection, plus adjustable current limitation to tailor the starting torque to the load. ## Panel fit and mounting flexibility Fastening is by screw or snap-on onto a DIN rail. Mounting position is flexible: with the optional fan, the unit can be rotated ±90° on a vertical surface and tilted ±22.5° front-to-back; without the fan, rotation is limited to ±10°. Clearance requirements: 60 mm above and 40 mm below for airflow, 15 mm at the sides. ## Derating and ambient limits The 25 A rating is at 40 °C ambient; above that derate linearly to 23 A at 50 °C and 21 A at 60 °C. Minimum load is 20 % of the rated current — below that the motor may not start reliably. The maximum motor cable length is 300 m, so long runs from the panel to the motor are fine as long as the voltage drop is accounted for.","metaTitle":"Siemens 3RW4026-1BB05 Soft Starter, SIRIUS, 25 A, Size S0","metaDescription":"Siemens 3RW4026-1BB05 SIRIUS soft starter, 25 A at 40 °C, Size S0, integrated bypass, screw terminals. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"155mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"45mm","title":"3RW4026-1BB05","Height":"125mm","Upwards":"60mm","Downwards":"40mm","Thyristors":"Yes","At The Side":"15mm","description":"SIRIUS soft starter S0 25 A, 15 kW/500 V, 40 °C 400-600 V AC, 24 V AC/DC Screw terminals","During Storage":"-40 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw and snap-on mounting","Minimum Load [%]":"20%","Mounting Position":"With additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"300m","Derating Temperature":"40°C","Inside-Delta Circuit":"No","at 50 Hz rated value":"24V","at 60 Hz rated value":"24V","at 40 °C rated value":"25A","at 50 °C rated value":"23A","at 60 °C rated value":"21A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"screw-type terminals","Motor Overload Protection":"Yes","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S0","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"1x 8, 2x (16 ... 10)","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"red","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"No","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":"No","at standard circuit at 40 °C rated value":"15kW","at standard circuit at 50 °C rated value":"20hp","control supply voltage 1 at DC rated value":"24V","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"AC/DC","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","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 at DC":"-20%","relative positive tolerance of the control supply voltage at DC":"20%","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":"8W","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":"10A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$320.04","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1505c819ef332617aa1e155337536e23.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=186427&mlfb=3RW4026-1BB05"},"ai":{"faq":[{"question":"What is the 3RW4026-1BB05's rated current at different ambient temperatures?","answer":"At 40 °C it is rated 25 A, derating to 23 A at 50 °C and 21 A at 60 °C. The derating temperature threshold is 40 °C — plan your panel ambient accordingly."},{"question":"Does the 3RW4026-1BB05 have an integrated bypass contactor?","answer":"Yes, it includes an integrated bypass contact system that shorts the thyristors after the motor reaches speed, reducing heat dissipation and extending the life of the power electronics."},{"question":"What mounting positions are allowed for the 3RW4026-1BB05?","answer":"With the optional fan, it can be mounted on a vertical surface with ±90° rotation and ±22.5° tilt front-to-back. Without the fan, rotation is limited to ±10°. Clearance: 60 mm above, 40 mm below, 15 mm at the sides."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4026-1BB05","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/3RW4026-1BB05 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}}