{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT6027-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT6027-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT6027-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT6027-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT6027-1BW40, screw terminals, 27.5 kW at 400 V 60 °C, AC-3 rated 690 V, DIN rail snap-on.","salesMarkdown":"The Siemens SIRIUS 3RT6027-1BW40 is a Size S0 power contactor rated for motor switching at 27.5 kW at 400 V (60 °C ambient) in AC-3 duty, with a maximum AC-3 rated voltage of 690 V. ## Motor ratings and thermal headroom Rated motor power at 60 °C ambient is 15.5 kW at 230 V, 27.5 kW at 400 V, and 47.5 kW at 690 V. The 60 °C rating means this contactor holds its full load current without derating in a warm panel — useful for enclosures with multiple devices or limited ventilation. The 690 V AC-3 ceiling covers 480 V and 575 V systems with margin. Width is 45 mm (single S0 footprint), depth 107 mm, height 85 mm. Main circuit terminals accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid/stranded, or AWG 2x (16–12) / 2x (14–8). Side-by-side mounting is permitted — no spacing required between units.","metaTitle":"Siemens 3RT6027-1BW40 SIRIUS Contactors, 27.5 kW at 400 V","metaDescription":"Siemens SIRIUS 3RT6027-1BW40 power contactor, Size S0, 27.5 kW at 400 V 60 °C, 690 V AC-3 rated, screw terminals, DIN rail mount, RoHS compliant, active production, available to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Width":"45 mm","at DC":"1 500 1/h","Height":"85 mm","Rated Value":"48 V","During Storage":"-55 ... +80 °C","at AC-1 maximum":"1 000 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","at AC-3e maximum":"750 1/h","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Power contactor","at 24 V rated value":"6 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"10 mm²","at 60 °C minimum permissible":"10 mm²","Insulation Voltage Rated Value":"690 V","at 230 V at 60 °C rated value":"15.5 kW","at 400 V at 60 °C rated value":"27.5 kW","at 690 V at 60 °C rated value":"47.5 kW","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","With Type Of Assignment 2 Required":"gL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 35 A","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 100 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","at ambient temperature 40 °C rated value":"50 A","at ambient temperature 60 °C rated value":"42 A","Type Of Voltage Of The Control Supply Voltage":"DC","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/df6a2140b3cc001cec9d7e4aa18c18f8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580219&mlfb=3RT6027-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT6027-1BW40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RT6027-1BW40 drop into a panel specified around 3RT6027-1AC20 without rewiring?","answer":"Yes — both are Size S0 with the same footprint (45 mm width) and screw-terminal layout. The main difference is the coil type: DC on the 1BW40, AC on the 1AC20. No rewiring is needed if the control voltage matches."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT6027-1BW40","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/3RT6027-1BW40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}