{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2344-1BA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2344-1BA40","canonicalUrl":"https://aoctrl.com/siemens/3RT2344-1BA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2344-1BA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2344-1BA40 contactor, AC-1 rated 110 A at 400 V, 4-pole, 12 V DC coil, 1 NO + 1 NC auxiliary contacts, screw terminals, with varistor.","salesMarkdown":"## 110 A AC-1, 4-pole, 12 V DC coil The Siemens 3RT2344-1BA40 is a SIRIUS contactor rated 110 A in AC-1 duty at 400 V and 40 °C ambient — that resistive-load rating is the one to use for heater banks, lighting, or transformer primary switching, not the motor-breaking AC-3 figure. Four main poles with a 690 V rated insulation voltage (pollution degree 3) and an 8 kV rated impulse withstand voltage on the main circuit — this covers 400 V line-to-line switching with solid margin for transient spikes. Coil is 12 V DC with screw-type terminals; the integrated varistor snubs the back-EMF on dropout, so you can drive it from a PLC digital output without an external flyback diode. ## Auxiliary contacts and wire termination Built-in 1 NO + 1 NC auxiliary contacts with screw terminals — enough for a seal-in circuit and a status feedback without bolting on an extra block. Drop-out time on DC is 38 to 57 ms — that window matters if your safety circuit relies on the NC mirror contact opening fast enough to catch a fault before the next scan. ## Clearance and mounting Up to two auxiliary switch blocks can be attached on the front — the contactor ships with the base 1 NO+1 NC, but you can stack additional blocks without losing the side clearance. The SIRIUS line is Siemens' standard contactor family, so BOM continuity is stable for new builds and MRO spares.","metaTitle":"Siemens 3RT2344-1BA40 SIRIUS Contactor, 110 A AC-1, 4-pole","metaDescription":"Siemens 3RT2344-1BA40 SIRIUS contactor, 110 A AC-1 at 400 V, 4-pole, 12 V DC coil, 1 NO+1 NC auxiliary, screw terminals, with varistor.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at DC":"38 ... 57 ms","title":"3RT2344-1BA40","Upwards":"10 mm","Forwards":"20 mm","Downwards":"10 mm","Attachable":"2","At The Side":"10 mm","description":"Contactor, AC-1, 110 A/400 V/40 °C, S3, 4-pole, 12 V DC, 1 NO+1 NC, with varistor, screw terminal","Initial Value":"0.8","Of Magnet Coil":"Screw-type terminals","Type Of Voltage":"DC","lifecycle_stage":"current","Full-Scale Value":"1.1","Product Brand Name":"SIRIUS","Product Designation":"Contactor","Of Contactor Typical":"10 000 000","at 400 V rated value":"38 A","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","at AC in hot operating state":"29.2 W","Of Auxiliary Circuit Rated Value":"6 kV","Product Function Bus Communication":"No","At Contactor For Auxiliary Contacts":"Screw-type terminals","at AC in hot operating state per pole":"7.3 W","Product Function Short Circuit Protection":"No","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Limited To 1 S Switching At Zero Current Maximum":"Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"Use minimum cross-section acc. to AC-1 rated value","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of The Auxiliary And Control Circuit With Degree Of Pollution 3 Rated Value":"690 V","Design Of The Miniature Circuit Breaker For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (230 V, 400 A)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/589d2506d1b6308a8f97adbcbc16094e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630032&mlfb=3RT2344-1BA40"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RT2344-1BA40?","answer":"This part is quoted to order against your BOM quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2344-1BA40","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/3RT2344-1BA40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}