{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1275-6NB36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1275-6NB36","canonicalUrl":"https://aoctrl.com/siemens/3RT1275-6NB36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6NB36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS vacuum contactor, S12 frame, 3RT1275-6NB36, 21-27.3 V coil, 70-240 mm² stranded cable, 750 ops/h AC-3, screw-type terminals.","salesMarkdown":"The S12 frame carries stranded cable from 70 mm² up to 240 mm², so this is sized for the heavy end of the low-voltage motor circuit, not a small auxiliary relay. The coil is rated 21 to 27.3 V, which is the standard 24 VDC nominal band with tolerance for a sagging battery or a long cable run. Pickup and dropout times are 80 to 100 ms on both AC and DC supplies, so the contactor responds consistently regardless of control voltage type — useful when the same BOM feeds both AC and DC panels. Switching frequency matters for duty cycle planning: at AC-3 (squirrel-cage motor starting) the maximum is 750 operations per hour; at AC-4 (plugging, inching) it drops to 250 ops/h. If your application needs frequent reversing or jogging, the AC-4 limit is the one that governs contactor life — exceeding it accelerates contact wear despite the vacuum bottle. Fastening is by screw fixing through an 11 mm hole — not a DIN-rail clip, so panel layout needs a drilled backplate or mounting rail with adapter. The 225 mm depth and 214 mm height mean it occupies significant panel volume — plan the gland plate and busbar routing accordingly.","metaTitle":"Siemens 3RT1275-6NB36 SIRIUS Vacuum Contactor, S12, 70-240 m","metaDescription":"Siemens SIRIUS vacuum contactor 3RT1275-6NB36, S12 frame, 70-240 mm² stranded, 21-27.3 V coil, AC-3 750 ops/h. Current production. Sourced to order.","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":"80 ... 100 ms","at DC":"80 ... 100 ms","Height":"214 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":"21 ... 27.3 V","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":"361 A","at 50 Hz rated value":"21 ... 27.3 V","at 500 V rated value":"2 A","at 60 Hz rated value":"21 ... 27.3 V","at 600 V rated value":"382 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"560 kW","For Auxiliary Contacts":"18 ... 14","Width Of Connection Bar":"25 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"125 hp","at 220/230 V rated value":"150 hp","at 460/480 V rated value":"300 hp","at 575/600 V rated value":"400 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":"63 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"350 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":"3.6 W","closing power of magnet coil at DC":"800 W","holding power of magnet coil at DC":"3.6 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":"21 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":"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/a5fb3fde8f76cca57f5eab6ffd09e393.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=362897&mlfb=3RT1275-6NB36","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6NB36/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1275-6NB36 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — no stock count or price is listed here."},{"question":"What is 3RT1275-6NB36's listed depth?","answer":"The depth is 225 mm. Combined with the 214 mm height and 160 mm width, this contactor requires careful panel layout planning, especially for gland plate and busbar clearance."},{"question":"What cable sizes does the 3RT1275-6NB36 accept?","answer":"The main power terminals accept stranded cable from 70 mm² up to 240 mm². The coil and auxiliary terminals accept solid or stranded wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²)."},{"question":"Will 3RT1275-6NB36 drop into a panel specified for 3RT1264-6AP36-0KA1 without rewiring?","answer":"No — the 3RT1275-6NB36 is an S12 frame with 70-240 mm² cable capacity, while the 3RT1264-6AP36-0KA1 is a different frame size with different terminal dimensions. Panel layout, mounting holes, and busbar connections would need to be reworked. These are not drop-in interchangeable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1275-6NB36","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/3RT1275-6NB36 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}}