{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1056-2AU36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1056-2AU36","canonicalUrl":"https://aoctrl.com/siemens/3RT1056-2AU36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1056-2AU36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1056-2AU36 power contactor, size S6, 240-277 V AC coil, spring-type terminals, screw fixing, 172 x 120 x 170 mm.","salesMarkdown":"The 3RT1056-2AU36: The S6 frame size (172 mm high, 120 mm wide, 170 mm deep) determines the panel cutout and backpan space. Mounting is by screw fixing through a single 9 mm hole, with the contactor body rotatable ±90° on a vertical surface and tiltable ±22.5° front-to-back — useful for tight enclosures where the gland plate or busbar layout forces an angled install. These are the numbers the panel designer needs to avoid derating from restricted airflow. ## Switching duty and endurance Maximum switching rates vary by duty: 800 cycles/hour under AC-1 (resistive), 750 under AC-3 (standard motor starting), and 130 under AC-4 (plugging/inching). The AC-3e rating matches the AC-3 figure at 750 cycles/hour. For a motor starter running at 30 starts/hour, this contactor will outlast the machine rebuild cycle. Arcing time is 10-15 ms, and total operating time (both AC and DC coil) is 40-60 ms — fast enough for most safety circuits that don't require a forced-guided contactor. ## Auxiliary contact block and wiring The contactor comes with an integrated auxiliary switch, rated 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V. This is enough for a feedback signal to a PLC input and a status lamp in parallel, without needing a separate terminal block. The coil terminals are spring-type — no screw torque to verify, which speeds panel wiring and eliminates a common QA re-torque step. ## Environmental limits The operating factor is 0.8 at both 50 Hz and 60 Hz, with a full-scale value of 1.1 and an initial value of 0.8. This means the coil can tolerate a sustained overvoltage of 10% above nominal, and will pick up reliably at 80% of rated voltage — important for long cable runs where voltage drop is a concern.","metaTitle":"Siemens 3RT1056-2AU36 SIRIUS Power Contactor, S6, 240-277V C","metaDescription":"Siemens SIRIUS 3RT1056-2AU36 power contactor, size S6, 240-277 V AC coil, spring-type terminals. Current production. Sourced to order. 172x120x170 mm.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"170 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"120 mm","at AC":"40 ... 60 ms","at DC":"40 ... 60 ms","title":"3RT1056-2AU36","Height":"172 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"25 ... 120 mm²","at 50 Hz":"0.8","at 60 Hz":"0.8","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"240 ... 277 V","description":"power contactor, AC-3e/AC-3 185 A, 90 kW / 400 V AC (50-60 Hz) / DC Uc: 240-277 V 3-pole, auxiliary contacts 2 NO + 2 NC drive: conventional main circuit: busbar control and auxiliary circuit: spring-loaded terminal","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Number Of Holes":"1","at AC-1 maximum":"800 1/h","at AC-2 maximum":"300 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"130 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw fixing","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","Diameter Of Holes":"9 mm","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Size Of Contactor":"S6","Solid Or Stranded":"2x (0,25 ... 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":"30 hp","at 400 V rated value":"3 A","at 440 V rated value":"1.4 A","at 480 V rated value":"180 A","at 50 Hz rated value":"240 ... 277 V","at 500 V rated value":"2 A","at 60 Hz rated value":"240 ... 277 V","at 600 V rated value":"192 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"90 kW","For Auxiliary Contacts":"24 ... 14","Width Of Connection Bar":"17 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"60 hp","at 220/230 V rated value":"75 hp","at 460/480 V rated value":"150 hp","at 575/600 V rated value":"200 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","Thickness Of Connection Bar":"3 mm","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"39 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"160 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"189 A","at AC-5b up to 400 V rated value":"153 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 315 A (690 V, 100 kA), aM: 200 A (690 V, 50 kA), BS88: 315 A (415 V, 50 kA)","Without Load Current Share Typical":"5.2 W","closing power of magnet coil at DC":"360 W","holding power of magnet coil at DC":"5.2 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 355 A (690 V, 100 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"13 W","for AWG cables for auxiliary contacts":"2x (24 ... 14)","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 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","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"AC/DC","Limited To 1 S Switching At Zero Current Maximum":"2 900 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"2 084 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"1 480 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"968 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"801 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":"1 000 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":"500 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":"95 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/48191814343ef1de12d436857500061f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=74844&mlfb=3RT1056-2AU36"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Height is 172 mm, width is 120 mm, depth is 170 mm. Minimum clearances: 10 mm upward, 10 mm downward, 20 mm forward, 10 mm to the sides."},{"question":"What wire sizes does the main circuit accept?","answer":"The main power terminals accept stranded conductors from 25 to 120 mm². Auxiliary terminals accept solid or stranded wire from 0.25 to 2.5 mm², up to two conductors per clamp."},{"question":"What is the coil voltage and terminal type?","answer":"The coil is rated 240-277 V AC and uses spring-type terminals — no screw torque required."},{"question":"What is the mechanical endurance?","answer":"Typical mechanical endurance is 10 million operations. Maximum switching frequency under AC-3 duty is 750 cycles per hour."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1056-2AU36","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/3RT1056-2AU36 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}}