{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1266-6NF36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1266-6NF36","canonicalUrl":"https://aoctrl.com/siemens/3RT1266-6NF36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6NF36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, Size S10, order code 3RT1266-6NF36, 96-127 V coil voltage, screw-type terminals, 210 x 145 x 206 mm.","salesMarkdown":"The Siemens 3RT1266-6NF36 is a SIRIUS vacuum contactor in Size S10. Vacuum contactors use sealed vacuum interrupters, making the switching chamber maintenance-free with minimal contact erosion over the rated mechanical life of 10,000,000 operations typical for this contactor size. The coil is rated for 96-127 V, covering both AC and DC control circuits within that window. ## Power circuit and termination The main power terminals accept stranded conductors from 70 mm² up to 240 mm², sized for the high currents this contactor class switches. Auxiliary control wiring uses screw-type terminals on the magnet coil, accepting solid or stranded conductors: 2x (0.5-1.5 mm²), 2x (0.75-2.5 mm²), or max 2x (0.75-4 mm²). Fastening is by screw fixing through a single 11 mm diameter hole. The contactor footprint measures 210 mm high, 145 mm wide, 206 mm deep — confirm the backplate layout against these dimensions before committing the panel layout. These are the minimum free-air gaps around the contactor body for proper arc quenching and heat dissipation. The vacuum contactor is built for high-cycling applications. Maximum operating rates: 750 operations per hour at AC-1 (resistive) and AC-3 (motor starting) duty, and 250 ops/hour at AC-2 (slip-ring motor) and AC-4 (plugging/inching) duty. The arcing time is 10-15 ms, and the arc is contained within the vacuum bottle — no ionized gas vented into the enclosure. The auxiliary switch is present (yes), and the contactor includes an integrated surge suppressor with a rated value of 1.1 times the coil voltage and an initial value of 0.8 times — this limits voltage spikes during coil dropout without needing an external RC snubber in most installations.","metaTitle":"Siemens 3RT1266-6NF36 SIRIUS Vacuum Contactor, Size S10, 96-","metaDescription":"Siemens 3RT1266-6NF36 SIRIUS vacuum contactor, Size S10, 96-127 VAC/DC coil. Rated for heavy motor switching. 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":"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":"80 ... 100 ms","at DC":"80 ... 100 ms","Height":"210 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"70 ... 240 mm²","at 50 Hz":"0.4","at 60 Hz":"0.4","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"96 ... 127 V","Initial Value":"0.8","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","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":"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 50 Hz rated value":"96 ... 127 V","at 500 V rated value":"2 A","at 60 Hz rated value":"96 ... 127 V","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":"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: 500 A (690 V, 100 kA), aM: 400 A (690 V, 50 kA), BS88: 450 A (415 V, 50 kA)","Without Load Current Share Typical":"3.4 W","closing power of magnet coil at DC":"630 W","holding power of magnet coil at DC":"3.4 W","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","voltage at PLC-control input rated value":"24 V","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","type of PLC-control input according to IEC 60947-1":"Type 2","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","operating range factor of the voltage at PLC-control input":"0.8 ... 1.1","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/f50d98257aea1e0e4e230ec8b9ea258f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=434152&mlfb=3RT1266-6NF36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6NF36/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1266-6NF36?","answer":"The peer MPN 3RT1266-6AP36-0KA1 is a Size S10 vacuum contactor in the same SIRIUS family, but with a different coil voltage range. Verify your control voltage before substituting; the 3RT1266-6NF36 uses a 96-127 V coil, while the -6AP36 variant uses a different coil rating."},{"question":"What conductor sizes does the main power terminal accept?","answer":"Stranded conductors from 70 mm² up to 240 mm². The auxiliary coil terminals accept 2x (0.5-1.5 mm²), 2x (0.75-2.5 mm²), or max 2x (0.75-4 mm²) solid or stranded."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1266-6NF36","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/3RT1266-6NF36 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}}