{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1275-6AD36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1275-6AD36","canonicalUrl":"https://aoctrl.com/siemens/3RT1275-6AD36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1275-6AD36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Vacuum contactor, Size S12, 3RT1275-6AD36, 42-48 V coil, screw fixing, 225 mm depth, 214 mm height, 160 mm width.","salesMarkdown":"## SIRIUS 3RT1275-6AD36 — Vacuum Contactor, Size S12 The Siemens 3RT1275-6AD36 is a SIRIUS-branded vacuum contactor in the S12 frame size, designed for high-cycle motor switching and furnace/kiln applications where air-break contacts wear too fast. The 42-48 V coil voltage means it drops into 48 VDC control buses common in heavy industrial panels — verify your supply rides above 42 V at the coil terminals under load, because the pickup threshold sits at 80% of rated value (33.6 V), and below that it won't pull in reliably. The main power terminals accept stranded cable from 70 up to 240 mm², so it handles the full range of motor feeder sizes for a S12-frame device. ## Duty Ratings & Switching Frequency This vacuum contactor is rated for 750 operations per hour in AC-3 (squirrel-cage motor starting) and AC-3e duty, and 700 ops/h in AC-1 (resistive load). The AC-4 (plugging/inching) ceiling is 250 ops/h — if your application reverses or jogs the motor frequently, that's the limit to respect for contact life. The arcing time on a vacuum bottle is 10-15 ms, which is tight enough to coordinate with upstream semiconductor fuses but fast enough to limit arc energy on inductive break. Auxiliary contacts are included, rated 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V — these are the dry-contact ratings for your PLC input or status feedback loop. The auxiliary switch block is screw-terminal type, same as the coil connection. If you're comparing against the 3RT1264-6AP36-0KA1 (a similar SIRIUS vacuum contactor in the same S12 frame), the key difference is the coil voltage and the auxiliary contact configuration. The 3RT1275-6AD36 uses a 42-48 V coil, while the 3RT1264-6AP36-0KA1 runs on a different voltage range. They share the same mounting footprint and main power terminal range, so a panel drilled for one can accept the other — but the coil supply must match. No rewiring of the main power circuit is needed; just confirm the control voltage. ## Environmental & Mounting The contactor is not sealed to an IP rating (it's an open-device panel mount), so it's intended for indoor, pollution-degree-2 environments inside a control cabinet. Mounting position flexibility (±22.5° tilt on vertical, or horizontal standing) helps when the backplate is already crowded. Physical envelope: 214 mm high, 160 mm wide, 225 mm deep. The depth is the dimension that typically catches people out during panel layout — 225 mm means you need at least 250 mm clear behind the mounting plate for cable bending radius on the 240 mm² terminals.","metaTitle":"Siemens 3RT1275-6AD36 SIRIUS Vacuum Contactor, S12 Size, 42-","metaDescription":"Siemens SIRIUS 3RT1275-6AD36 vacuum contactor, size S12, 42-48V coil. Rated for high-cycle motor switching. 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","title":"3RT1275-6AD36","Height":"214 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"70 ... 240 mm²","at 50 Hz":"0.9","at 60 Hz":"0.9","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"42 ... 48 V","description":"vacuum contactor AC-3e/AC-3 400 A, 200 kW / 400 V, 3-pole, Uc: 42-48 V AC(50-60 Hz) / DC drive: conventional auxiliary contacts 2 NO + 2 NC main circuit: busbar control and auxiliary circuit: screw terminal","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":"42 ... 48 V","at 500 V rated value":"2 A","at 60 Hz rated value":"42 ... 48 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":"10 W","closing power of magnet coil at DC":"920 W","holding power of magnet coil at DC":"10 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","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2b592b4c61df0dd6459bbce5a6bc4014.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=6313&mlfb=3RT1275-6AD36"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RT1275-6AD36?","answer":"The 3RT1264-6AP36-0KA1 is the closest peer in the same SIRIUS S12 vacuum contactor family. It shares the same mounting footprint and main power terminal range (70-240 mm² stranded), but the coil voltage differs — the 3RT1275-6AD36 uses 42-48 V, so verify your control voltage before substituting. No rewiring of the main power circuit is needed if the coil supply matches."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1275-6AD36","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/3RT1275-6AD36 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}