{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-2BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-2BB44","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-2BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor 3RT2027-2BB44, S0 frame, 24 VDC coil, spring-type terminals, 45 mm width on DIN rail.","salesMarkdown":"The coil is 24 VDC with spring-type terminals, rated to pick up at 0.8 x the rated value and hold at up to 1.1 x the rated value. No built-in auxiliary switch is fitted. The headline motor rating is 5 hp at 230 V, which is the AC-3 duty point for a standard squirrel-cage motor. That tells you the contactor is sized for a 3–4 kW motor on a 230 V three-phase line. For DC switching, the rated breaking currents drop sharply with voltage: 6 A at 24 VDC, 2 A at 48 V, 1 A at 110 V, 0.3 A at 220 V — this is the DC-13 rating for switching solenoids and electromagnets. Switching frequency limits are: 1 000 cycles/hour for AC-1 resistive loads, 750 cycles/hour for AC-2 and AC-3 motor loads, and 250 cycles/hour for AC-4 reversing or inching duty. The AC-3e rating at 750 cycles/hour applies to energy-efficient IE3/IE4 motors with higher inrush. ## Mounting and Clearance — Panel Integration Height is 102 mm, depth is 154 mm. Clearance needed: 10 mm above and below, 10 mm forward, 6 mm at the sides.","metaTitle":"Siemens 3RT2027-2BB44 SIRIUS Power Contactor, 24 VDC Coil, S","metaDescription":"Siemens SIRIUS power contactor 3RT2027-2BB44, 24 VDC coil, spring-type terminals, S0 frame, 45 mm wide, current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"154 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"15 ... 18 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","For Main Contacts":"18 ... 8","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 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"6 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"27 A","at 500 V rated value":"2 A","at 600 V rated value":"27 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 hp","at 575/600 V rated value":"25 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"6.3 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"22 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"44 A","at AC-5b up to 400 V rated value":"26.5 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)","Without Load Current Share Typical":"5.9 W","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.3 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"DC","Limited To 1 S Switching At Zero Current Maximum":"499 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"341 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"260 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"199 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"162 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6142d4d18561e583334019ee325de07c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=409334&mlfb=3RT2027-2BB44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BB44/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 3RT2028-1BB44-3MA0?","answer":"The 3RT2028-1BB44-3MA0 is a peer in the same S0 frame family, but it carries a different coil voltage and auxiliary contact configuration. The 3RT2027-2BB44 has a 24 VDC coil with spring-type terminals and no auxiliary switch. If your panel was wired for 24 VDC and spring terminals, the 3RT2028-1BB44-3MA0 may not drop in without rewiring. Verify the coil voltage and auxiliary contact count before substituting."},{"question":"What is the listed depth?","answer":"The depth is 154 mm. That is the dimension from the DIN rail mounting surface to the front of the contactor body, not including any protruding auxiliary contact blocks or wiring."},{"question":"What wire sizes does it accept?","answer":"The main contacts accept solid or stranded wire from 1 to 10 mm². The coil terminals accept 2 x (0.5 to 2.5 mm²) solid or stranded. All terminations are spring-type — no screw tightening required."},{"question":"Will it drop into a panel specified for 3RT2028-1BB44-3MA0 without rewiring?","answer":"Only if the panel was wired for a 24 VDC coil and spring-type terminals, and no auxiliary contacts were required. The 3RT2028-1BB44-3MA0 may have a different coil voltage or auxiliary configuration. Check the nameplate coil rating and the auxiliary contact count before assuming a direct swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-2BB44","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/3RT2027-2BB44 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}}