{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1055-6AT36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1055-6AT36","canonicalUrl":"https://aoctrl.com/siemens/3RT1055-6AT36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1055-6AT36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1055-6AT36, Size S6 power contactor, 575-600 VAC 50/60 Hz coil, screw-type terminals, auxiliary switch included.","salesMarkdown":"It's the main switching device for motor loads and resistive heating banks in industrial control panels — the sort of thing you'd find on a MCC bucket or a standalone motor starter enclosure. The coil is rated for 575 to 600 VAC at 50/60 Hz, which means it's built for 600 V class control circuits common in North American and some export panels. Coil termination is screw-type, so you're landing ring or fork terminals, not spring cages. ## Mounting and Clearance — What the Panel Guy Needs Mounting is screw-fixing through a single 9 mm hole, not DIN rail — plan for a drilled backplate. The contactor can sit on a vertical surface and be rotated ±90° or tilted ±22.5° front-to-back, which gives some flexibility for cable entry orientation. Keep at least 10 mm clearance above and below, 10 mm to the sides, and 20 mm in front for arc flash and cooling. That's tighter than some older S6 frames, so check your existing gland plate layout if you're retrofitting. ## Ratings That Drive the Application The main power path accepts stranded conductors from 25 to 120 mm² — that's good for motor feeds up to around 200-250 A depending on duty cycle and ambient. The auxiliary switch (built-in) handles 10 A at 24 V, 2 A at 48 V or 60 V, and 1 A at 110 V. For resistive loads (AC-1), you can cycle it up to 800 times per hour. For standard motor starting (AC-3), it's 750 cycles per hour. Heavy inching or plugging (AC-4) drops that to 130 cycles per hour. The rated power factor at operational current is 0.8 at both 50 and 60 Hz, so it's designed for typical induction motor loads.","metaTitle":"Siemens 3RT1055-6AT36 SIRIUS Power Contactor, Size S6, 575-6","metaDescription":"Siemens SIRIUS 3RT1055-6AT36 power contactor, size S6. 575-600 VAC 50/60 Hz coil, screw terminals. Current production. Sourced to order against an 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":"156 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":"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,"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=98101&mlfb=3RT1055-6AT36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1055-6AT36/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RT1055-6AS36?","answer":"The 3RT1055-6AS36 is a peer within the same SIRIUS Size S6 family. The key difference is the coil voltage: the -6AT36 uses a 575-600 VAC coil, while the -6AS36 uses a different coil voltage. Panel footprint, mounting hole pattern, and main power terminal sizes are identical, so it will drop into the same mounting holes and bus bars without rewiring the power circuit. The auxiliary wiring and control circuit would need to match the new coil voltage."},{"question":"What are the main dimensions of this contactor?","answer":"Height is 172 mm, width is 120 mm, and depth is 170 mm. It mounts with a single 9 mm screw hole."},{"question":"What wire sizes does the main power path accept?","answer":"The main poles accept stranded conductors from 25 mm² up to 120 mm². The auxiliary switch terminals accept solid or stranded wire from 0.5 mm² up to 4 mm² (two conductors per terminal)."},{"question":"Will 3RT1055-6AT36 drop into a panel designed for 3RT1055-6AS36?","answer":"Yes, mechanically and for the power circuit. Both are Size S6 with the same mounting hole and clearance requirements. The only difference is the coil voltage — verify the control transformer taps or control voltage source before landing the coil wires."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1055-6AT36","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/3RT1055-6AT36 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}}