{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1266-6LA06","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1266-6LA06","canonicalUrl":"https://aoctrl.com/siemens/3RT1266-6LA06","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6LA06","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1266-6LA06 vacuum contactor, S10 frame size, 302 A at 480 V AC-3, 3-pole, screw fixing, 70-240 mm² stranded main conductors.","salesMarkdown":"## S10 vacuum contactor built for heavy switching The Siemens 3RT1266-6LA06 is a SIRIUS vacuum contactor in the S10 frame size, designed for motor switching and resistive loads where the arc needs to be extinguished fast and cleanly — the vacuum bottle does that in 10-15 ms arcing time. Rated 302 A at 480 V in AC-3 duty, this contactor handles the full-load current of a 200-250 hp motor at 480 V without derating the main poles. ## Power terminations and wiring constraints Main power conductors land on screw-type terminals that accept stranded cable from 70 mm² up to 240 mm² — that is a 2/0 AWG to 500 kcmil range, sized for the full 302 A without needing parallel runs. The magnet coil has its own screw-type terminals, separate from the main power lugs, so the control wiring stays isolated from the high-current path. ## Mounting and panel clearance Fastening is by screw fixing through a single 11 mm diameter hole — no DIN rail clip on the S10 frame, so budget for a drilled backplate or mounting bracket. The contactor measures 210 mm high, 145 mm wide, and 206 mm deep, including the arc chute and coil housing. Minimum clearances: 10 mm above and below, 10 mm to the sides, and 20 mm forward of the arc chamber — respect these to keep the arc flash from tracking to adjacent gear. Mechanical endurance is 10 million cycles typical — the vacuum interrupter contacts do not erode the way air-break contacts do, so the rated life is effectively the coil and mechanism wear limit. Maximum switching rates: 750 operations per hour in AC-1 and AC-3 duty, 250 ops/h in AC-2 and AC-4 — the heavier the load make/break, the more thermal recovery time the contactor needs between operations. ## Temperature range and auxiliary contact ratings An auxiliary switch block is built in.","metaTitle":"Siemens 3RT1266-6LA06 SIRIUS Vacuum Contactor, S10","metaDescription":"Siemens SIRIUS 3RT1266-6LA06 vacuum contactor, S10 frame, rated 302 A at 480 V AC-3. Current production. Screw fixing, 70-240 mm² stranded termination.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"206 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"145 mm","at AC":"40 ... 80 ms","at DC":"40 ... 80 ms","Height":"210 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":"750 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":"S10","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":"302 A","at 500 V rated value":"200 kW","at 600 V rated value":"289 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"400 kW","For Auxiliary Contacts":"18 ... 14","Width Of Connection Bar":"25 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"100 hp","at 220/230 V rated value":"125 hp","at 460/480 V rated value":"250 hp","at 575/600 V rated value":"300 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":"42 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"280 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: 500 A (690 V, 100 kA), aM: 400 A (690 V, 50 kA), BS88: 450 A (415 V, 50 kA)","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 500 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":"14 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":"185 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/5814a74351c0346fb6a6db70416e038e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=252929&mlfb=3RT1266-6LA06","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6LA06/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1266-6LA06","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/3RT1266-6LA06 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}}