{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5043-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5043-0","canonicalUrl":"https://aoctrl.com/siemens/5TT5043-0","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5043-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5TT5043-0 insta contactor, 4 NC contacts, 230 V AC control, 400 V rated, 40 A, IP20, 3 MW width, 71 mm depth.","salesMarkdown":"## What this contactor does — 4 NC switching for 230 V AC circuits The 5TT5043-0 is a Siemens SENTRON insta contactor with 4 normally-closed (NC) contacts and zero normally-open (NO) contacts. It is designed for switching loads at 230 V AC control voltage, with a maximum rated voltage of 400 V and DC control capability at 220 V DC. The 4 NC configuration means this contactor is normally passing current when de-energized — it opens the circuit when the coil is energized. This suits applications like safety interlocks, emergency stops, or fail-safe circuits where the load must be powered in the default state. ## Panel fit and thermal management — 3 MW on DIN rail The contactor occupies 3 modular width units (MW) on a 35 mm DIN rail. Dimensions are 71 mm depth, 53.5 mm width, and 90 mm height, with an installation depth of 64 mm. The IP20 rating means it is intended for enclosed panel use only — no washdown or outdoor exposure. Siemens explicitly notes that spacers must be provided between contactors to ensure adequate heat dissipation. Each pole dissipates 4 W at rated current in hot operating state — stacking units without air gap can exceed the thermal budget.","metaTitle":"Siemens 5TT5043-0 Insta Contactor, 4 NC, 230 V AC, 400 V","metaDescription":"Siemens SENTRON 5TT5043-0 insta contactor, 4 NC contacts, 230 V AC control, 400 V rated. Active production. Quoted to order against BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"53.5 mm","Height":"90 mm","Maximum":"400 V","Minimum":"400 V","Rated Value":"230 V","lifecycle_stage":"current","at DC rated value":"220 V","Installation Depth":"64 mm","Product Brand Name":"SENTRON","Product Designation":"Insta contactor","Rated Value Maximum":"230 V","protection class IP":"IP20","Design Of The Product":"4 NC contacts","number of NC contacts":"4","number of NO contacts":"0","Installation Or Assembly Note":"provision must be made for spacers to ensure heat dissipation","Number Of Modular Width Units":"3","Type Of Voltage Of The Operating Voltage":"AC","Product Extension Installable Supplementary Devices":"Yes","Type Of Voltage Of The Operating Voltage For Actuation":"AC/DC","power loss [W] for rated value of the current at AC in hot operating state per pole":"4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/504a7b83efff1b4548e34dc9a8fdd367.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=229624&mlfb=5TT5043-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5TT5043-0/alternatives.json"},"ai":{"faq":[{"question":"Does 5TT5043-0 have any normally-open contacts?","answer":"No, it has 4 NC contacts and zero NO contacts. If your circuit requires a normally-open switching path, this contactor does not provide one — you would need a different variant or an auxiliary contact block."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5043-0","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/5TT5043-0 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}}