{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1055-6AU36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1055-6AU36","canonicalUrl":"https://aoctrl.com/siemens/3RT1055-6AU36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1055-6AU36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1055-6AU36 power contactor, size S6, 240-277 V AC coil, screw-type terminals, 172 x 120 x 170 mm.","salesMarkdown":"It's part of the SIRIUS modular contactor family, which means it integrates with the same SIRIUS accessory ecosystem for overload relays, suppressors, and busbar systems. The contactor measures 172 mm high by 120 mm wide by 170 mm deep, and mounts via screw fixing to a vertical surface. It carries a 240-277 V AC coil, with a pickup threshold of 0.8 x rated voltage at both 50 Hz and 60 Hz, and a dropout threshold of 0.8 x rated voltage. The full-scale operating range extends to 1.1 x rated voltage, so it holds in on a stiff 277 V line without saturation issues. That's a tight window for a contactor this size — it holds takt time on a weld line where every cycle is gated by the main contactor's dropout. The mechanical endurance is 10,000,000 operations typical, which translates to years of service at 750 cycles/hour under AC-3 duty. Switching frequency varies by duty class: 800 cycles/hour at AC-1 (resistive), 750 cycles/hour at AC-3 (motor start/run), and 130 cycles/hour at AC-4 (plugging/inching). If your application involves frequent reversing or jogging, the AC-4 limit is the one that governs — exceeding it will overheat the arc chamber. The main power circuit accepts stranded conductors from 25 to 120 mm², which covers everything from a 35 mm² motor feed to a 95 mm² busbar tap. The auxiliary circuit uses screw-type terminals accepting 2x (0.5-1.5 mm²) solid or 2x (0.75-2.5 mm²) stranded, with a max of 2x (0.75-4 mm²). That's enough for two parallel 1.5 mm² control wires per terminal. The built-in auxiliary switch is rated 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V. Those are the current-carrying limits for the auxiliary contacts — don't use them to switch the coil of a downstream contactor without checking the inrush against these ratings. ## Integration and Panel Layout These are the minimum air gaps to adjacent metalwork or other devices — ignoring them can cause flashover during arc extinction. The mounting holes are 9 mm diameter, single hole per terminal, so use M8 bolts or studs.","metaTitle":"Siemens 3RT1055-6AU36 SIRIUS Power Contactor, Size S6, 240-2","metaDescription":"Siemens SIRIUS 3RT1055-6AU36 power contactor, size S6, 240-277 V AC coil, screw terminals, 170 mm depth. Active production. Sourced to order.","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","title":"3RT1055-6AU36","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-3 150 A, 75 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: screw terminal","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":"156 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":"144 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":"50 hp","at 220/230 V rated value":"60 hp","at 460/480 V rated value":"125 hp","at 575/600 V rated value":"150 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":"27 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"132 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":"162 A","at AC-5b up to 400 V rated value":"124 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":"9 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":"2 727 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 831 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"1 300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"850 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"703 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=152804&mlfb=3RT1055-6AU36"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT1055-6AU36?","answer":"The 3RT1055-6LA06 is a direct peer within the same SIRIUS size S6 frame. The primary difference is the coil voltage — 6LA06 uses a 110 V AC coil versus the 240-277 V AC coil on the 6AU36. Panel cutouts and accessory compatibility are identical; the swap decision depends entirely on your control voltage."},{"question":"What are the physical dimensions of 3RT1055-6AU36?","answer":"Height is 172 mm, width is 120 mm, and depth is 170 mm. The mounting hole diameter is 9 mm."},{"question":"What wire sizes does the main power circuit accept?","answer":"The main terminals accept stranded conductors from 25 mm² up to 120 mm². The auxiliary terminals accept 2x (0.5-1.5 mm²) solid or 2x (0.75-2.5 mm²) stranded, with a maximum of 2x (0.75-4 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1055-6AU36","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/3RT1055-6AU36 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}}