{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1275-6AT36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1275-6AT36","canonicalUrl":"https://aoctrl.com/siemens/3RT1275-6AT36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6AT36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, size S12, 3RT1275-6AT36, rated 575-600 V AC, screw-type coil terminals, 225 mm depth, 214 mm height, 160 mm width.","salesMarkdown":"The Siemens 3RT1275-6AT36 is a SIRIUS-branded vacuum contactor, design size S12. Vacuum contactors are specified for switching medium-voltage motor loads where arc extinction in air is insufficient — the vacuum bottle quenches the arc in a sealed chamber, giving a clean break with minimal contact erosion. The rated voltage is 575... 600 V AC, which places it in the low-voltage range but at the upper end, often used in 600 V class industrial distribution in North America and 575 V Canadian mining or heavy industrial installations. The coil circuit uses screw-type terminals, accepting solid or stranded conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²). The main power circuit accepts stranded conductors from 70 up to 240 mm² — that is substantial cable, consistent with the current-carrying capacity of a size S12 frame. Pickup voltage is 0.8 of rated value; dropout is not stated but typically around 0.6–0.7 for this class. Maximum switching rates vary by duty category: at AC-1 (resistive loads) 700 operations per hour; at AC-2 (slip-ring motors) 250/h; at AC-3 (squirrel-cage motors, starting only) 750/h; at AC-4 (plugging, inching) 250/h; and at AC-3e (enhanced AC-3) also 750/h. The AC-3 and AC-3e rates are the ones that matter for most motor-starting applications — 750 ops/h means a cycle time of about 4.8 seconds, which is fast enough for conveyor or pump cycling. ## Mechanical Life and Environmental Limits That is a high count, consistent with vacuum contactors that see little contact wear. Fastening is by screw fixing through one 11 mm diameter hole. An auxiliary switch is included. Its rated values: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V. These are the continuous current ratings at the stated DC voltages — useful for control circuit design. The full-scale overload factor is 1.1, meaning the contactor can sustain 110% of its rated current for a defined period (typically 1 hour per IEC 60947).","metaTitle":"Siemens 3RT1275-6AT36 SIRIUS Vacuum Contactor, S12, 575-600V","metaDescription":"Siemens 3RT1275-6AT36 SIRIUS vacuum contactor, size S12. Rated 575-600 V AC, screw-type coil terminals, 225 mm depth. Active production, sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"225 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"160 mm","at AC":"60 ... 100 ms","at DC":"60 ... 100 ms","title":"3RT1275-6AT36","Height":"214 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"70 ... 240 mm²","at 50 Hz":"0.9","at 60 Hz":"0.9","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"575 ... 600 V","description":"vacuum contactor AC-3e/AC-3 400 A, 200 kW / 400 V, 3-pole, Uc: 575-600 V AC(50-60 Hz) / DC drive: conventional auxiliary contacts 2 NO + 2 NC 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":"700 1/h","at AC-2 maximum":"250 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 fixing","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","Diameter Of Holes":"11 mm","Mounting Position":"+/-22,5° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface; standing, on horizontal mounting surface","Size Of Contactor":"S12","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":"Vacuum 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":"6 A","at 400 V rated value":"3 A","at 480 V rated value":"361 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":"382 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"560 kW","For Auxiliary Contacts":"18 ... 14","Width Of Connection Bar":"25 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"125 hp","at 220/230 V rated value":"150 hp","at 460/480 V rated value":"300 hp","at 575/600 V rated value":"400 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","Thickness Of Connection Bar":"6 mm","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"63 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"350 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":"2/0 ... 500 kcmil","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 800 A (690 V, 50 kA), aM: 630 A (690 V, 50 kA), BS88: 800 A (415 V, 50 kA)","Without Load Current Share Typical":"10 W","closing power of magnet coil at DC":"920 W","holding power of magnet coil at DC":"10 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 800 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":"21 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","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":"370 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/5e66d12d9bed38ece89875ebb4e3de7e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=405038&mlfb=3RT1275-6AT36"},"ai":{"faq":[{"question":"What is the depth of 3RT1275-6AT36?","answer":"The depth is 225 mm, with a height of 214 mm and width of 160 mm."},{"question":"What conductor sizes does the main power circuit accept?","answer":"The main power circuit accepts stranded conductors from 70 mm² up to 240 mm²."},{"question":"Where can I buy 3RT1275-6AT36?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation is available for 3RT1275-6AT36?","answer":"As a Siemens SIRIUS product, the contactor carries CE marking and is designed to IEC 60947 standards. Specific RoHS, REACH, and UL documentation would be provided with the shipment or on request; the evidence does not list individual cert numbers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1275-6AT36","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/3RT1275-6AT36 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}}