{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5840-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5840-6","canonicalUrl":"https://aoctrl.com/siemens/5TT5840-6","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5840-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON Insta contactor, 5TT5840-6, 4 NO contacts, 230 V AC coil, 40 A at 400 V AC, 3 modular width units, IP20.","salesMarkdown":"## What This SENTRON Insta Contactor Does The Siemens 5TT5840-6 is a SENTRON Insta contactor with 4 normally open (NO) contacts, designed for switching resistive and incandescent lamp loads up to 4000 W. The coil is rated 230 V AC, and the main contacts switch 40 A at 400 V AC — a common fit for lighting panels, HVAC contactor banks, and general-purpose switching in commercial distribution boards. ## Mounting and Heat Dissipation The manufacturer explicitly requires spacers between adjacent devices for heat dissipation — pack them tight without airflow and the 4 W per-pole power loss (16 W total at rated load) will accumulate. IP20 finger-safe housing suits enclosed panel mounting, not open washdown areas. ## Contact Configuration and Coil Voltage Four NO contacts, zero NC contacts — this is a make-only contactor for normally-off loads. The 230 V AC coil is the only coil voltage variant on record. Supplementary devices (auxiliary contact blocks, surge suppressors) can be added via the product extension interface.","metaTitle":"Siemens 5TT5840-6 SENTRON Insta Contactor, 4 NO","metaDescription":"Siemens 5TT5840-6 SENTRON Insta contactor with 4 normally open contacts, 230V AC coil, rated 40A at 400V. Active production, quoted to order. IP20 finger-safe.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"54 mm","title":"5TT5840-6","Height":"90 mm","Maximum":"440 V","Minimum":"440 V","Rated Value":"230 V","description":"INSTA contactor 0/1-automatic with 4 NO contacts Contact for 230 V AC, 400V 40A Control 230 V AC","lifecycle_stage":"current","Installation Depth":"0 mm","Product Brand Name":"SENTRON","Product Designation":"Insta contactor","Rated Value Maximum":"230 V","protection class IP":"IP20","Design Of The Product":"4 NO contacts","number of NC contacts":"0","number of NO contacts":"4","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","Switching Capacity Active Power With Incandescent Lamp Load":"4 000 W","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":"$145.52","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/efb22f6f352bf30a5260bf8d6324b528.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=66222&mlfb=5TT5840-6"},"ai":{"faq":[{"question":"Does Siemens 5TT5840-6 have normally open or normally closed contacts?","answer":"It has 4 normally open (NO) contacts and zero normally closed (NC) contacts — a make-only contactor for normally-off loads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5840-6","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/5TT5840-6 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}}