{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1056-6AT36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1056-6AT36","canonicalUrl":"https://aoctrl.com/siemens/3RT1056-6AT36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1056-6AT36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S6 power contactor, 3RT1056-6AT36, 575-600 V AC coil, screw-type coil terminals, size S6 frame.","salesMarkdown":"## SIRIUS S6 power contactor — 3RT1056-6AT36 The Siemens 3RT1056-6AT36 is a SIRIUS S6-size power contactor with a 575-600 V AC coil, screw-type coil terminals, and an integrated auxiliary switch. It's built for motor switching in industrial control panels where the coil voltage matches a 575-600 VAC control bus — common in North American 600 V class installations. Size S6 frame means the main power terminals accept stranded cable from 25 to 120 mm², so it handles motor feeders up to roughly 200-250 A depending on duty. The coil pulls in at 24 V rated value 10 A on the auxiliary contacts, with the main poles rated for AC-3 switching at 750 operations per hour. ## Duty cycle and switching frequency The contactor's maximum switching rate varies sharply by duty class: 800 ops/h for AC-1 resistive loads, 750 ops/h for AC-3 motor starting, and only 130 ops/h for AC-4 plugging/reversing. That AC-4 limit is the one that catches panel builders — if your application involves inching or reversing under load, you need to respect that 130 ops/h ceiling or the contactor will overheat. Arcing time runs 10-15 ms, with total opening time 40-60 ms on both AC and DC control. The 0.8 power factor at 50/60 Hz matches typical motor loads. Mounts via screw fixing with a 9 mm hole. That forward clearance is the tightest dimension — make sure the panel door or gland plate doesn't crowd the arc chute. Envelope is 172 mm high, 120 mm wide, 170 mm deep. The main cable entry uses the 25-120 mm² stranded range; auxiliary wiring accepts 2x 0.5-1.5 mm² solid or 2x 0.75-2.5 mm² stranded, max 2x 4 mm².","metaTitle":"Siemens 3RT1056-6AT36 SIRIUS Power Contactor, S6 Size, 575-6","metaDescription":"Siemens 3RT1056-6AT36 SIRIUS power contactor, S6 size, 575-600V AC coil, screw terminals. Rated for AC-3 switching at 750 ops/h. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"170 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"120 mm","at AC":"40 ... 60 ms","at DC":"40 ... 60 ms","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":"575 ... 600 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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 (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²), max. 2x (0,75 ... 4 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":"575 ... 600 V","at 500 V rated value":"2 A","at 60 Hz rated value":"575 ... 600 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":"18 ... 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","at AWG cables for main contacts":"4 ... 250 kcmil","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":"screw-type 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":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 355 A (690 V, 100 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"13 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), 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","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,"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=483040&mlfb=3RT1056-6AT36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1056-6AT36/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT1056-6AT36?","answer":"The 3RT1055-6QF35 is a smaller frame (S3 vs S6) with a different coil voltage and lower current capacity — it won't drop into the same footprint or handle the same motor feeder cable (25-120 mm² vs smaller terminals). The 3RT1264-6AP36-0KA1 is a vacuum contactor variant with a different arc extinction method. Neither is a direct swap without rewiring and re-rating the panel."},{"question":"Where can I buy 3RT1056-6AT36?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What compliance documentation does Siemens provide for 3RT1056-6AT36?","answer":"As a standard SIRIUS catalog item, this contactor carries CE marking for the European market and is designed to meet IEC 60947-4-1 for contactors and motor-starters. UL/CSA listings are typical for the SIRIUS family but should be confirmed against the specific variant's declaration of conformity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1056-6AT36","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/3RT1056-6AT36 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}}