{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1266-6NP36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1266-6NP36","canonicalUrl":"https://aoctrl.com/siemens/3RT1266-6NP36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6NP36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1266-6NP36 vacuum contactor, Size S10, 200-277 V AC/DC magnet coil, screw-type terminals, with auxiliary switch, screw fixing.","salesMarkdown":"## Vacuum contactor for high-cycle motor switching The Siemens 3RT1266-6NP36 is a SIRIUS vacuum contactor in Size S10, designed for applications where arc extinction and contact life are critical — vacuum bottles quench the arc in a sealed chamber, so the main contacts see minimal erosion even under frequent AC-3 or AC-4 duty. ## Mounting and clearance for panel integration Fastening is by screw fixing through a single 11 mm hole — the contactor is bolted, not DIN-rail snapped, so the panel backplate needs a drilled and tapped location. Dimensions are 210 mm high × 145 mm wide × 206 mm deep — the depth is the dominant constraint for enclosure selection; a standard 300 mm deep cabinet leaves about 94 mm for wiring and arc chute clearance behind the door. ## Switching performance and auxiliary contact ratings Mechanical endurance is 10 million operating cycles typical — the vacuum interrupter contributes to this by eliminating contact erosion from arcing in air, so the contactor outlasts an equivalent air-break unit in high-cycle applications like conveyor or pump cycling. Maximum switching rates: 750 operations per hour in AC-1 and AC-3 duty, 250 ops/h in AC-2 and AC-4 — AC-4 (plugging/inching) is the most severe; the 250 ops/h limit reflects the thermal recovery time of the vacuum bottle after a high-energy break. ## Power cable termination and ambient limits Main power conductors: stranded 70–240 mm² — this is a heavy cable range, consistent with a Size S10 contactor rated for motor currents up to roughly 400–500 A in AC-3; the lug or crimp terminal must match the contactor's bus bar hole pattern. Coil power factor at 50/60 Hz is 0.4 — this is the phase angle between voltage and current in the AC coil circuit; a control transformer feeding multiple such contactors must be sized for the apparent power (VA), not just the real power (W), to avoid saturation on inrush.","metaTitle":"Siemens 3RT1266-6NP36 SIRIUS Vacuum Contactor, Size S10","metaDescription":"Siemens 3RT1266-6NP36 SIRIUS vacuum contactor, Size S10, 200-277 V coil, screw terminals, auxiliary switch included. Active production, quoted to order.","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":"200 ... 277 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":"200 ... 277 V","at 500 V rated value":"2 A","at 60 Hz rated value":"200 ... 277 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)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"14 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","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/05d83fcbbae192dd26f1ab1ee78d80e1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=216856&mlfb=3RT1266-6NP36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1266-6NP36/alternatives.json"},"ai":{"faq":[{"question":"What size cable does the main power termination accept?","answer":"The main power terminals accept stranded conductors from 70 mm² up to 240 mm². This is a heavy cable range consistent with the Size S10 frame rating for motor currents up to roughly 400–500 A in AC-3 duty."},{"question":"What are the mounting clearances required for 3RT1266-6NP36?","answer":"These are for arc venting and magnetic blowout, not electrical creepage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1266-6NP36","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/3RT1266-6NP36 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}}