{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1275-6AR36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1275-6AR36","canonicalUrl":"https://aoctrl.com/siemens/3RT1275-6AR36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6AR36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, size S12, 3RT1275-6AR36, 440-480 V AC, screw fixing, auxiliary switch included.","salesMarkdown":"The Siemens 3RT1275-6AR36 is a SIRIUS vacuum contactor in size S12 — that's the frame size that tells you the mechanical and thermal capacity before you even look at the coil. Vacuum contacts mean the arc is quenched in a sealed chamber, so there's no contact erosion from switching air-break arcs, which makes this a solid pick for frequent switching or dusty environments where a standard contactor would wear fast. It's a screw-fixing mount, not a DIN-rail snap, so plan for panel drilling on a vertical surface; the mounting position allows ±22.5° rotation and tilt, plus standing on a horizontal surface, which gives some layout flexibility in a tight cabinet. Rated coil voltage is 440-480 V AC, with a pickup threshold of 0.8 x rated value and a dropout at 0.9 x rated at 50/60 Hz — so at 440 V nominal, it holds in down to about 352 V and drops out around 396 V. That's a tight dropout band; if your line dips under brownout conditions, this contactor drops faster than a standard 0.7 x dropout design. Switching frequency varies by duty: AC-1 (resistive) maxes at 700 ops/h, AC-3 (squirrel-cage motor start/run) at 750 ops/h, AC-4 (plugging/inching) at 250 ops/h. The AC-3e rating also hits 750 ops/h — that's the energy-efficient motor version of the same duty. Arcing time is 10-15 ms, and operate times at both AC and DC are 60-100 ms. For a vacuum contactor, those are standard; the arc time is shorter than an air-break equivalent, which matters if you're coordinating with upstream fuses or a motor protection relay. ## Termination and wiring reality Main power terminals accept stranded cable from 70 mm² up to 240 mm² — that's serious cable, sized for the full rated current of the S12 frame. The coil connection is screw-type terminals, accepting solid or stranded wire: 2x 0.5-1.5 mm², 2x 0.75-2.5 mm², max 2x 0.75-4 mm². Auxiliary switch is included, so you don't need to order a separate side-mount block for feedback to the PLC. The auxiliary contacts are rated at 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V — typical for a signal-level contact, not for driving a load directly.","metaTitle":"Siemens 3RT1275-6AR36 SIRIUS Vacuum Contactor, S12 Size","metaDescription":"Siemens 3RT1275-6AR36 SIRIUS vacuum contactor, size S12. Rated 440-480 V AC, screw fixing. Current lifecycle stage. Sourced to order against 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":"3RT1275-6AR36","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":"440 ... 480 V","description":"vacuum contactor AC-3e/AC-3 400 A, 200 kW / 400 V, 3-pole, Uc: 440-480 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":"440 ... 480 V","at 500 V rated value":"2 A","at 60 Hz rated value":"440 ... 480 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/a0d47e01fa20764366383bb867310e8b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=414045&mlfb=3RT1275-6AR36"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RT1275-6AR36?","answer":"Submit an RFQ through this listing. Pricing and availability are confirmed at quote time through independent distribution channels. No stock count or price is shown here because both fluctuate with supply."},{"question":"What are the key dimensions of 3RT1275-6AR36?","answer":"Height is 214 mm, width is 160 mm, and depth is 225 mm. The 225 mm depth is the critical dimension for enclosure fit."},{"question":"Will 3RT1275-6AR36 drop into a panel designed for 3RT1264-6AP36-0KA1?","answer":"Both are S12 frame size contactors from the SIRIUS family, so the mounting hole pattern and overall footprint should match. The 3RT1275-6AR36 uses screw fixing, same as the peer. Verify the coil voltage — this one is 440-480 V AC — and the auxiliary contact configuration against your existing wiring, since the peer may have a different auxiliary arrangement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1275-6AR36","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/3RT1275-6AR36 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}}