{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5740-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5740-2","canonicalUrl":"https://aoctrl.com/siemens/5TT5740-2","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5740-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON Insta contactor, 5TT5740-2, 4 NO contacts, 40 A rated operating current at 230/400 V AC, 24 V DC coil, IP20, 3 width units.","salesMarkdown":"## Siemens 5TT5740-2 SENTRON Insta Contactor — 40 A, 4 NO, 24 V DC Coil The coil is 24 V DC, making it compatible with standard 24 V DC control systems common in industrial panels. Rated operating current of 40 A at both 230 V and 400 V AC — this is the thermal current (Ith) for the contactor, meaning it can carry 40 A continuously through the main poles in open air. The 3 000 W filament lamp switching capacity tells you it handles incandescent lighting loads with high inrush; for LED or fluorescent ballasts, derate per the manufacturer's guidelines. The 3 width units (each 18 mm) give a 54 mm wide footprint on the DIN rail, so it occupies three standard modular positions in a distribution board. Overall dimensions: 90 mm high, 54 mm wide, 71 mm deep, with an installation depth of 64 mm behind the panel face. Four NO contacts give you four independent switching poles — useful for splitting a load across phases or for multi-circuit control.","metaTitle":"Siemens 5TT5740-2 SENTRON Insta Contactor, 40 A, 4 NO, 24 V","metaDescription":"Siemens 5TT5740-2 SENTRON Insta contactor, 4 NO contacts, 40 A rated at 230/400 V AC, 24 V DC coil, IP20, 3 width units. Active lifecycle, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"54 mm","Height":"90 mm","Maximum":"440 V","Minimum":"440 V","Rated Value":"230 V","lifecycle_stage":"current","Installation depth":"64 mm","Product brand name":"SENTRON","Product designation":"Insta contactor","Protection class IP":"IP20","at DC / rated value":"24 V","Number of NC contacts":"0","Number of NO contacts":"4","Number of width units":"3","Rated Value / Maximum":"24 V","acc. to DIN EN 61346-2":"Q","acc. to DIN EN 81346-2":"Q","Operating current / rated value":"40 A","Operating current / at AC / rated value":"40 A","Type of voltage / of the operating voltage":"AC","Switching capacity active power / with filament lamp load":"3 000 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=143351&mlfb=5TT5740-2","alternativesUrl":"https://aoctrl.com/api/mcp/products/5TT5740-2/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5TT5740-2?","answer":"The 5TT5740-2 is a 40 A rated contactor with 4 NO contacts, a 24 V DC coil, rated for 230 V and 400 V AC operation. It has a filament lamp switching capacity of 3 000 W and IP20 protection."},{"question":"Where can I buy the 5TT5740-2 and get a price?","answer":"The 5TT5740-2 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5740-2","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/5TT5740-2 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}}