{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1275-6AU36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1275-6AU36","canonicalUrl":"https://aoctrl.com/siemens/3RT1275-6AU36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6AU36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, Size S12, 3RT1275-6AU36, 240-277 V AC coil, screw-type terminals, 225 mm depth, 160 mm width, 214 mm height.","salesMarkdown":"The Siemens 3RT1275-6AU36 is a SIRIUS vacuum contactor in Size S12. The vacuum arc-quenching chamber keeps contacts clean over the rated mechanical life of 10,000,000 operations. Rated coil voltage is 240-277 V AC, and the coil termination is screw-type terminals. The auxiliary switch is included, which saves ordering a separate block for basic feedback or status indication. The power circuit accepts stranded cable from 70 to 240 mm² — that's a heavy lug range, consistent with the Size S12 frame's current-handling capability. The control circuit solid/stranded range is 0.5 to 4 mm², which covers standard control wiring. If you're terminating fine-stranded control wire, note the 0.5 mm² minimum; don't go smaller. Switching frequency limits: 750 operations per hour at AC-3 (motor starting), 700 at AC-1 (resistive), and 250 at AC-2 or AC-4 (slip-ring motor or plugging duty). The AC-3e rating also maxes at 750 ops/h. Auxiliary contact ratings: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V. These are the make/break capacities for the built-in auxiliary switch — useful for interlocking or PLC input feedback. If you need more than one auxiliary contact, you'll add a separate block. The power factor is 0.9 at both 50 and 60 Hz. Fastening is screw fixing through a single 11 mm hole. The contactor dimensions are 225 mm deep, 160 mm wide, 214 mm high. That forward clearance is the one to watch — 20 mm means the arc chute and coil cover need that space for cooling and access. The Size S12 frame is a standard Siemens contactor footprint; if you're replacing a similar SIRIUS unit, the mounting hole pattern and busbar connections should align. The arcing time is 10-15 ms, and the dropout times at both AC and DC are 60-100 ms — that's the interval before the auxiliary contacts change state after coil de-energization.","metaTitle":"Siemens 3RT1275-6AU36 SIRIUS Vacuum Contactor, Size S12, 240","metaDescription":"Siemens 3RT1275-6AU36 SIRIUS vacuum contactor, Size S12, 240-277V coil, 225mm depth. Sourced to order against RFQ. Current lifecycle stage.","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":"3RT1275-6AU36","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":"240 ... 277 V","description":"vacuum contactor AC-3e/AC-3 400 A, 200 kW / 400 V, 3-pole, Uc: 240-277 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":"240 ... 277 V","at 500 V rated value":"2 A","at 60 Hz rated value":"240 ... 277 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","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)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"21 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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/9c1f49e5c90a14be01c8399936ae8ff9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=18635&mlfb=3RT1275-6AU36"},"ai":{"faq":[{"question":"What is the depth of the 3RT1275-6AU36?","answer":"The depth is 225 mm, with a width of 160 mm and height of 214 mm. Clearance requirements are 10 mm up/down, 20 mm forward, and 10 mm at the sides."},{"question":"What wire sizes does the 3RT1275-6AU36 accept?","answer":"The power circuit accepts stranded cable from 70 to 240 mm². The control circuit accepts solid or stranded wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1275-6AU36","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/3RT1275-6AU36 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}}