{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-1BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-1BB44","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-1BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-1BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2027-1BB44 power contactor, size S0, 24 VDC coil, screw-type terminals, 3-pole main contacts, 45 mm width.","salesMarkdown":"The 3RT2027-1BB44: The 24 VDC coil draws 6 A at its rated value, which is the inrush current to pull the armature in. The coil operating range is 0.8 to 1.1 times the rated voltage, so it will pick up reliably at 19.2 VDC and hold in up to 26.4 VDC. This is a standard control voltage for industrial DC buses, common in PLC-driven panels. The main contacts are rated for AC-3 duty (squirrel-cage motor switching) at 750 operating cycles per hour maximum, and AC-1 (resistive) at 1,000 cycles per hour. For the most demanding AC-4 duty (inching/plugging), the maximum is 250 cycles per hour. These limits govern the thermal load on the contact tips — exceeding them accelerates wear, especially on AC-4 where the contacts make and break under full motor current. For DC switching, the contactor is rated at 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. These are the maximum resistive currents the contacts can interrupt at those voltages — DC arcs are harder to extinguish than AC, so the ratings drop sharply as voltage rises. The motor rating at 230 V is 5 hp, which gives a quick sizing reference for typical North American motor loads on a 230 V single-phase or three-phase supply. This allows installation in tight or awkward panel orientations without derating. Physical dimensions are 85 mm height, 45 mm width, and 151 mm depth. These are minimum air gaps for arc flash and heat dissipation — crowding the contactor reduces its effective switching life. Wire range for the main and coil terminals: solid or stranded 1 to 10 mm², or two conductors of 0.5 to 1.5 mm² or 0.75 to 2.5 mm². The screw-type terminals are standard for panel wiring — no special crimp tools needed, but torque to the manufacturer's specification (not listed here) for reliable connection. ## Operating Conditions and Lifecycle The operating temperature range covers most indoor industrial environments; the wide storage range allows for unheated warehouses or shipping in extreme climates. The dropout delay is the time from coil power removal to main contact opening — important for sequencing in safety circuits or when coordinating with upstream breakers. ## Configuration Notes This variant has no auxiliary switch block integrated — the auxiliary switch is listed as 'No'. If you need auxiliary contacts for status feedback or interlocking, you will need to order a separate auxiliary contact block (e.g., the 3RT29 series) that clips onto the front or side of the S0 contactor. The main contact configuration is listed as '16... 8', which typically indicates the contact arrangement for a 3-pole contactor with normally open main contacts. This is the standard for motor starting — three NO poles for the motor circuit.","metaTitle":"Siemens SIRIUS 3RT2027-1BB44 Power Contactor, S0, 24 VDC Coi","metaDescription":"Siemens SIRIUS 3RT2027-1BB44 power contactor, size S0, 24 VDC coil, 3-pole main contacts. Rated for AC-3 switching at 750 cycles/h. Screw terminals, DIN rail mount. Current product","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"151 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"15 ... 18 ms","Height":"85 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":"Screw-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":"16 ... 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 ... 1.5 mm²), 2x (0.75 ... 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":"screw-type 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":"screw-type 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":"Screw-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 ... 16), 2x (18 ... 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), 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)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","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/fc70f4a3c54fd28da6b30f13cbb128ba.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=342648&mlfb=3RT2027-1BB44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2027-1BB44/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation is available for the 3RT2027-1BB44?","answer":"As a Siemens SIRIUS product, it is manufactured under IEC and EN standards (the DIN rail mounting references DIN EN 60715). Typical compliance includes CE marking for the European market, and UL/CSA listings for North America (though specific certification numbers are not in this record). The product is RoHS and REACH compliant as standard for current Siemens industrial control gear. For specific certificates, the Siemens Industry Online Support portal provides the declaration of conformity and UL file number under the 3RT2 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-1BB44","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/3RT2027-1BB44 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}}