{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1276-6AD36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1276-6AD36","canonicalUrl":"https://aoctrl.com/siemens/3RT1276-6AD36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1276-6AD36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, Size S12, order code 3RT1276-6AD36, screw fixing, 225 mm depth, 160 mm width, 214 mm height.","salesMarkdown":"The 3RT1276-6AD36 is a Siemens SIRIUS vacuum contactor in the Size S12 frame, designed for high-cycle motor switching where arc extinction needs to be fast and contact erosion minimal. Vacuum interrupters mean the arcing time stays tight at 10 to 15 ms, and the contactor handles up to 750 operations per hour in AC-3 duty (and 750/h in AC-3e as well), so it's suited for frequent start-stop profiles on conveyors, pumps, or compressors. The coil pulls in on 42 to 48 V, with a pick-up threshold of 0.8 × rated value and a drop-out band of 0.9 at 50/60 Hz — that's a standard control voltage range for many panel designs. ## Termination and cable prep — what lands on the lugs The main power circuit accepts stranded cable from 70 mm² up to 240 mm² — that's a heavy lug range, typical for feeders in the 200–400 A class. The coil and auxiliary terminals are screw-type, accepting solid or stranded conductors: 2× (0.5 to 1.5 mm²), 2× (0.75 to 2.5 mm²), or max 2× (0.75 to 4 mm²). The auxiliary switch is included (yes, it ships with it), so the kit is complete for feedback or interlock wiring. Fastening is screw fixing through a single 11 mm hole — no DIN-rail clip on this frame; it bolts directly to the panel backplate. ## Switching times and coil data — for the commissioning engineer The full-scale value is 1.1.","metaTitle":"Siemens 3RT1276-6AD36 SIRIUS Vacuum Contactor, Size S12","metaDescription":"Siemens 3RT1276-6AD36 SIRIUS vacuum contactor, Size S12 frame. Rated for 70-240 mm² stranded cable. Current lifecycle stage. Quoted 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":"3RT1276-6AD36","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":"42 ... 48 V","description":"vacuum contactor AC-3e/AC-3 500 A, 250 kW / 400 V, 3-pole, Uc: 42-48 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":"477 A","at 50 Hz rated value":"42 ... 48 V","at 500 V rated value":"2 A","at 60 Hz rated value":"42 ... 48 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","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":"32 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/ceb5ffdb61dadb10d2ef43e097fb93ec.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=115930&mlfb=3RT1276-6AD36"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1276-6AD36?","answer":"The peer MPN 3RT1264-6AP36-0KA1 is a Size S10 frame contactor in the same SIRIUS vacuum family, but it is a smaller frame — it will not drop into a panel wired for the S12 without rewiring the main power lugs and checking the mounting hole pattern."},{"question":"What are the key dimensions of 3RT1276-6AD36?","answer":"Depth is 225 mm, width is 160 mm, and height is 214 mm. It mounts via screw fixing through a single 11 mm hole."},{"question":"What cable sizes does the main circuit accept?","answer":"The main power terminals accept stranded cable from 70 mm² up to 240 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1276-6AD36","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/3RT1276-6AD36 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}}