{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1276-6AR36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1276-6AR36","canonicalUrl":"https://aoctrl.com/siemens/3RT1276-6AR36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1276-6AR36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, Size S12, 3RT1276-6AR36, rated 440-480 V, screw fixing, 225 mm depth.","salesMarkdown":"Rated for 440 to 480 V, it handles the common 480 V three-phase distribution voltage found across North American and some European industrial plants. The vacuum switching technology means the arcing time sits at 10 to 15 ms, which keeps contact erosion low. Operating time is 60 to 100 ms on both AC and DC control supplies, so the coil response is consistent regardless of the control voltage type. Fastening is by screw fixing through a single 11 mm diameter hole, so the contactor bolts directly to a backplate or sub-panel — no DIN rail adapter is used here. Dimensions are 214 mm high, 160 mm wide, and 225 mm deep — verify the gland plate and enclosure depth before laying out the panel. ## Wiring and conductor ranges The main power circuit accepts stranded conductors from 70 to 240 mm² — sized for the full rated current of the S12 frame. The coil and auxiliary terminals are screw-type and accept solid or stranded wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or a maximum of 2x (0.75 to 4 mm²). An auxiliary switch is built in, rated at 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V — check the control voltage against these ratings for the aux circuit. ## Switching rates and duty cycles Maximum switching rates per hour: 700 for AC-1 (resistive loads), 250 for AC-2 (slip-ring motors), 750 for AC-3 (squirrel-cage motors, starting only), 250 for AC-4 (plugging/inching), and 750 for AC-3e (enhanced AC-3). The AC-3 rate of 750 operations per hour is the one that governs most standard motor-starting applications — it matches the mechanical capability without thermal overload. ## Environmental limits","metaTitle":"Siemens 3RT1276-6AR36 SIRIUS Vacuum Contactor, Size S12, 440","metaDescription":"Siemens 3RT1276-6AR36 SIRIUS vacuum contactor, Size S12, rated 440-480V. Current lifecycle stage. Screw fixing, 225 mm depth. 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","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","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":"477 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":"472 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"710 kW","For Auxiliary Contacts":"18 ... 14","Width Of Connection Bar":"25 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"150 hp","at 220/230 V rated value":"200 hp","at 460/480 V rated value":"400 hp","at 575/600 V rated value":"500 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":"96 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"430 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":"32 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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=213947&mlfb=3RT1276-6AR36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1276-6AR36/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT1276-6AR36?","answer":"The depth is 225 mm, measured from the mounting surface to the furthest front projection."},{"question":"What conductor sizes does the main circuit accept?","answer":"The main power terminals accept stranded conductors from 70 to 240 mm²."},{"question":"What compliance documentation does Siemens provide for 3RT1276-6AR36?","answer":"As a SIRIUS product, it typically carries CE marking for the European market and may have UL/CSA certifications depending on the specific variant. Request the declaration of conformity and the specific approval markings from your Siemens contact or distributor for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1276-6AR36","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/3RT1276-6AR36 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}}