{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4026-2BB15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4026-2BB15","canonicalUrl":"https://aoctrl.com/siemens/3RW4026-2BB15","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4026-2BB15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4026-2BB15 soft starter, Size S0, 25 A at 40 °C, 110-230 VDC control, spring-loaded terminals, integrated bypass.","salesMarkdown":"## What this soft starter delivers The Siemens 3RW4026-2BB15 is a SIRIUS soft starter in the Size S0 frame, rated 25 A at 40 °C. That 25 A figure is the continuous motor current it can handle in standard ambient — at 50 °C it derates to 23 A, and at 60 °C to 21 A, so if your panel runs hot you size off the derated number, not the headline. It carries an integrated bypass contact system, meaning once the motor is up to speed the thyristors are shorted out — no continuous heat dissipation from the semiconductors, which keeps the enclosure cooler and extends component life. Control supply is 110-230 VDC, a single DC rail that covers most industrial control voltages without needing a separate transformer tap. Depth is 155 mm, so account for that when spacing the backplane. Main current circuit uses spring-loaded terminals; auxiliary and control circuits also use spring-loaded terminals. Accepts 2x (0.25... 2.5 mm²) solid or stranded — strip length is whatever the terminal spec calls for, but 8 mm is typical for this class. Clearance: 60 mm upwards, 40 mm downwards, 15 mm at the sides — those are the minimum air gaps for heat dissipation, not suggestions. ## Protection and control features Built-in motor overload protection and intrinsic device protection — the soft starter monitors its own temperature and the motor current. Adjustable current limitation lets you set the starting torque profile without external hardware. External reset is supported — useful if the starter is inside a locked panel and you want a remote reset button on the door. Minimum load is 20 % of the rated current; below that the internal current sensing may not trip reliably. Rated insulation voltage is 600 V, and the pollution degree is 3 per IEC 60947-4-2 — that's conductive pollution typical of industrial environments, so no derating needed for dusty or mildly humid panels.","metaTitle":"Siemens 3RW4026-2BB15 Soft Starter, 25 A, Size S0","metaDescription":"Siemens 3RW4026-2BB15 SIRIUS soft starter, 25 A at 40 °C, Size S0 frame with integrated bypass. Spring-loaded terminals, 110-230 VDC control.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"155mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45mm","title":"3RW4026-2BB15","Height":"150mm","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, 110-230 V AC/DC spring-type 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%","For Main Contacts":"16 ... 10, 1x 8","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 40 °C rated value":"25A","at 50 °C rated value":"23A","at 60 °C rated value":"21A","For Auxiliary Contacts":"2x (24 ... 14)","For Main Current Circuit":"spring-loaded 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)","control supply voltage 1 at DC":"110 ... 230V","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"red","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"spring-loaded 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","control supply voltage 1 at AC at 50 Hz":"110 ... 230V","control supply voltage 1 at AC at 60 Hz":"110 ... 230V","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":"No","at standard circuit at 40 °C rated value":"15kW","at standard circuit at 50 °C rated value":"20hp","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%","relative negative tolerance of the control supply voltage at DC":"-15%","relative positive tolerance of the control supply voltage at DC":"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":"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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f7e942a9e898f528ff4cef2f7509d41a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=337446&mlfb=3RW4026-2BB15"},"ai":{"faq":[{"question":"Does the 3RW4026-2BB15 require an external reset?","answer":"It supports an external reset, but it is not required — the soft starter can be reset locally. The external reset option is useful for remote panel installations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4026-2BB15","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/3RW4026-2BB15 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}}