{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-2BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-2BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-2BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2027-2BB40 power contactor, size S0, 24 VDC coil, spring-type terminals, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## S0 Frame, 24 VDC Coil, Spring-Terminal Power Contactor The Siemens 3RT2027-2BB40 is a SIRIUS power contactor in the S0 frame size, with a 24 VDC coil and spring-type terminals on both the coil and main circuits. It mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward. ## Switching Duty and Mechanical Life Rated for 1,000 switching cycles per hour in AC-1 resistive duty, 750 cycles/h in AC-2 and AC-3 motor duty, and 250 cycles/h in AC-4 plugging/reversing duty. Mechanical endurance is 10 million operations typical, which suits high-cycle applications like conveyor systems or pump panels where the contactor cycles frequently. ## Coil and Auxiliary Contact Ratings The 24 VDC coil draws 10 A at pickup (inrush) and 1.1 A holding, with an operating range of 0.8 to 1.1 times rated voltage. The built-in auxiliary switch is rated 2 A at 48/60 VDC, 1 A at 110 VDC, 0.9 A at 125 VDC, and 0.3 A at 220 VDC — these are the DC-13 inductive load ratings for the auxiliary contacts. At 230 V, the contactor is rated for 5 hp motor load; at 400 V the auxiliary contacts carry 3 A. ## Installation Clearances and Conductor Sizes The S0 envelope measures 45 mm wide, 102 mm high, and 107 mm deep — the depth figure is the dimension from the DIN rail mounting surface to the furthest projection. Minimum clearance to adjacent components: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm to the side. Main circuit terminals accept solid or stranded conductors from 1 to 10 mm², and the spring terminals accept two conductors of 0.5 to 2.5 mm² each. ## Environmental Range and Lifecycle Status Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C.","metaTitle":"Siemens 3RT2027-2BB40 SIRIUS Power Contactor, S0","metaDescription":"Siemens 3RT2027-2BB40 SIRIUS power contactor, size S0, 24 VDC coil, spring-type terminals. Active production. Sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"107 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":"Yes","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":"10 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)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.3 W","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 / P600","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":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$80.01","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e8a7914c3c8c7fb1a389d354c9ef5e6f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=265209&mlfb=3RT2027-2BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT2027-2BB40?","answer":"The 3RT2036-1AC20-ZX95 is a peer in the same SIRIUS S0 frame family, but it uses an AC coil rather than the 24 VDC coil of the 3RT2027-2BB40. Panel fit is the same S0 footprint and DIN-rail mounting, but the coil voltage difference means a direct drop-in without rewiring is not possible — the coil supply must match."},{"question":"What compliance documentation does Siemens provide for 3RT2027-2BB40?","answer":"Siemens provides RoHS and REACH compliance declarations, along with UL, CSA, and IEC certifications for the SIRIUS contactor series. The specific certification markings are printed on the nameplate and available in the product documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-2BB40","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/3RT2027-2BB40 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}}