{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4036-1BB15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4036-1BB15","canonicalUrl":"https://aoctrl.com/siemens/3RW4036-1BB15","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4036-1BB15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4036-1BB15 soft starter, 45 A at 40 °C, S2 frame, 110-230 VDC control supply, integrated bypass, screw-type terminals.","salesMarkdown":"## Rated current across the temperature band The 3RW4036-1BB15 delivers 45 A at 40 °C, derating to 42 A at 50 °C and 39 A at 60 °C. That 6 A drop from 40 °C to 60 °C means the thermal budget in a warm cabinet directly sets the motor full-load current you can start — if the enclosure ambient runs at 50 °C, you lose 3 A of headroom off the 40 °C nameplate. The derating temperature threshold is 40 °C, so any panel ambient above that forces a linear reduction in continuous motor current. For a 37 kW motor at 400 V drawing roughly 72 A FLC, this unit is undersized — you step up to the next frame. It fits 22 kW motors comfortably at 40 °C ambient. ## Integrated bypass and thyristor stack An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed. This eliminates SCR conduction losses during run — the heat load in the panel drops to just the bypass contactor's dissipation, not the full semiconductor drop. The thyristors themselves handle the start ramp only. Because the bypass is internal, you do not need an external contactor in parallel. That saves one DIN-rail slot and the wiring between the soft starter and the bypass contactor. The S2 frame (55 mm wide) fits standard 35 mm DIN rail with screw or snap-on mounting. ## Control supply and protection features Control supply voltage accepts 110-230 VDC, which covers common DC bus voltages in industrial panels. The wide range means you can power it from a standard 24 VDC supply only if you step up — 110 VDC is the minimum, so a 24 VDC-only panel needs a DC-DC converter or a separate 110 VDC rail. Motor overload protection is built in, along with intrinsic device protection and adjustable current limitation. The minimum load is 20 % of the rated current, so light-load applications like small pumps or fans need to stay above that threshold or the soft starter may not trigger correctly. The insulation voltage is 600 V, matching standard 400 VAC systems with margin. ## Mounting clearances and cable lengths The 3RW4036-1BB15 requires 60 mm clearance upwards, 40 mm downwards, and 30 mm at the sides. These are the minimum air gaps for heat dissipation from the thyristor stack and bypass contactor — crowding them raises internal temperature and accelerates derating. Maximum motor cable length is 300 m. For long cable runs from the panel to the motor, stay under this limit to avoid reflected wave voltage spikes that can stress the thyristors. The unit accepts stranded wire up to 25 mm² on the main circuit terminals and solid wire up to 2.5 mm² for control.","metaTitle":"Siemens 3RW4036-1BB15 SIRIUS Soft Starter, 45A at 40°C","metaDescription":"Siemens 3RW4036-1BB15 SIRIUS soft starter, 45A rated at 40°C, S2 frame size, 110-230 VDC control supply. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Soft Starters"],"specifications":{"Depth":"170mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"55mm","title":"3RW4036-1BB15","Height":"160mm","Upwards":"60mm","Stranded":"2x (1.5 ... 25 mm²)","Downwards":"40mm","Thyristors":"Yes","At The Side":"30mm","description":"SIRIUS soft starter S2 45 A, 30 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":"45A","at 50 °C rated value":"42A","at 60 °C rated value":"39A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"screw-type terminals","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (16 ... 2)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S2","Using The Back Clamping Point":"16 ... 2","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"18 ... 2","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":"30kW","at standard circuit at 50 °C rated value":"40hp","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":"6W","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":"23A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$543.56","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/41f0fac0d3f82d4de4fe49bbf3647749.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=466597&mlfb=3RW4036-1BB15"},"ai":{"faq":[{"question":"What is the maximum motor cable length for the 3RW4036-1BB15?","answer":"300 m. For runs approaching this limit, consider output reactors or dv/dt filters to protect the thyristors from reflected wave spikes."},{"question":"How can I order the 3RW4036-1BB15 or check availability?","answer":"Submit an RFQ for current availability and pricing — no stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4036-1BB15","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/3RW4036-1BB15 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}}