{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4026-1BB15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4026-1BB15","canonicalUrl":"https://aoctrl.com/siemens/3RW4026-1BB15","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4026-1BB15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4026-1BB15 soft starter, size S0, 45 mm width, 25 A rated at 40 °C, 110-230 VDC control supply, screw-type terminals, integrated bypass contact system.","salesMarkdown":"## Rated current and thermal derating The 3RW4026-1BB15: That 40 °C derating temperature means the full 25 A is only available up to that point — above it, the thyristor junction temperature limits the output. For a 400 V motor drawing 22 A FLA in a 50 °C cabinet, this unit lands right at the derated 23 A ceiling; no headroom for overload cycling. ## Mounting and panel fit Size S0 frame, 45 mm wide, 125 mm tall, 155 mm deep — fits a standard 45 mm DIN-rail slot with screw or snap-on fastening. The mounting position is flexible: with the optional fan, the unit rotates ±90° on a vertical surface and tilts ±22.5° front-to-back; without the fan, rotation is limited to ±10°. Clearance requirements: 60 mm above, 40 mm below, 15 mm at the sides for airflow and wiring access. ## Control supply and wiring Control supply is 110-230 VDC, with screw-type terminals for both the main current circuit and auxiliary/control circuits. Maximum wire length to the motor is 300 m — beyond that, voltage drop on start and cable capacitance can cause nuisance trips on the thyristor gate drive. ## Integrated protection and bypass Built-in motor overload protection and intrinsic device protection (thyristor overtemperature, phase imbalance) are standard. The adjustable current limitation lets you set the start current between 20% and 100% of the rated current — useful for soft-starting conveyors or pumps where the breakaway torque is low. The integrated bypass contact system shorts the thyristors after start, eliminating semiconductor conduction losses during run; the unit runs cool and the bypass relay handles the continuous current. ## Environmental and compliance Operating temperature range -25 to +60 °C; storage -40 to +80 °C. Storage class per IEC 60721: 1K6 (occasional condensation), 1C2 (no salt mist), 1S2 (sand ingress prevented), 1M4 (mechanical). Insulation voltage rated 600 V, operating frequency 50-60 Hz.","metaTitle":"Siemens 3RW4026-1BB15 SIRIUS Soft Starter, 25A, Size S0","metaDescription":"Siemens 3RW4026-1BB15 SIRIUS soft starter, 25 A at 40 °C, size S0, 45 mm wide. 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":"3RW4026-1BB15","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, 110-230 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 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)","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":"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","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 (0.5 ... 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","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":"-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/3ac1253826836184f637aa3efd307b0e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=81774&mlfb=3RW4026-1BB15"},"ai":{"faq":[{"question":"What is the 3RW4026-1BB15's rated current at different temperatures?","answer":"The derating temperature is 40 °C — above that, output current must be reduced per the curve."},{"question":"Does the 3RW4026-1BB15 include an internal bypass contactor?","answer":"Yes, it has an integrated bypass contact system that shorts the thyristors after the motor reaches full speed, eliminating semiconductor conduction losses during continuous run."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4026-1BB15","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/3RW4026-1BB15 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}}