{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1276-6LA06","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1276-6LA06","canonicalUrl":"https://aoctrl.com/siemens/3RT1276-6LA06","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1276-6LA06","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, size S12, order code 3RT1276-6LA06, rated 477 A at 480 V, screw fixing, 225 mm depth.","salesMarkdown":"## SIRIUS vacuum contactor, size S12 — 477 A at 480 V The Siemens 3RT1276-6LA06 is a SIRIUS vacuum contactor in the S12 frame size, rated for 477 A at 480 V. That 477 A figure governs the main pole current-carrying capacity under AC-1 duty — resistive loads at that voltage. For motor switching (AC-3), the mechanical life is rated at 10,000,000 cycles typical, and the maximum operating rate hits 750 operations per hour. The vacuum arc-quenching chamber keeps arcing time to 10 to 15 ms, which means less contact erosion and a cleaner break on inductive loads compared to an air-break contactor of the same frame. Mounting is by screw fixing — four holes, 11 mm diameter, on a 160 mm wide by 214 mm tall footprint. Standing orientation on a horizontal surface is also permitted. That 225 mm depth includes the coil terminals, which are screw-type. For the main power circuit, stranded cable from 70 to 240 mm² is accepted. Control wiring takes solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²). ## Auxiliary switch and control ratings An auxiliary switch is included as standard. Its contact ratings across the voltage range: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. These are the make-and-break capacities for the auxiliary circuit — useful for interlocking, status feedback, or PLC input signals.","metaTitle":"Siemens 3RT1276-6LA06 SIRIUS Vacuum Contactor, 477 A at 480","metaDescription":"Siemens SIRIUS vacuum contactor 3RT1276-6LA06, size S12, rated 477 A at 480 V. 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","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","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","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 500 V rated value":"355 kW","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":"No","Substance Prohibitance (Date)":"05/01/2012","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)","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":"https://cdn.aoctrl.com/1b4cc38041a9ce5d2b6a50da77bfe506.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=350873&mlfb=3RT1276-6LA06","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1276-6LA06/alternatives.json"},"ai":{"faq":[{"question":"What is the rated current of 3RT1276-6LA06 at 480 V?","answer":"The contactor is rated for 477 A at 480 V, which is the AC-1 resistive load rating for the main poles."},{"question":"What are the mounting dimensions and clearances for 3RT1276-6LA06?","answer":"The contactor measures 160 mm wide by 214 mm tall by 225 mm deep. Required clearances: 10 mm up, 10 mm down, 20 mm forward, and 10 mm at the sides. Mounting is by screw fixing with four 11 mm diameter holes."},{"question":"How do I get pricing and availability for 3RT1276-6LA06?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at the time of quote."},{"question":"What wire sizes does 3RT1276-6LA06 accept for main and control circuits?","answer":"Main power circuit accepts stranded cable from 70 to 240 mm². Control circuit terminals accept solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1276-6LA06","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/3RT1276-6LA06 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}}