{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5843-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5843-2","canonicalUrl":"https://aoctrl.com/siemens/5TT5843-2","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5843-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5TT5843-2 insta contactor, 4 NC contacts, 24 V AC control, 400 V 40 A rated, IP20, 3 modular width units.","salesMarkdown":"The Siemens 5TT5843-2 is a SENTRON insta contactor with 4 normally-closed (NC) contacts, controlled by a 24 V AC coil and rated for 400 V at 40 A. The 4 NC contacts are all normally-closed — zero NO contacts — so this contactor is designed for fail-safe circuits where the load must be disconnected when the coil is de-energized. Think safety interlocks, emergency-stop chains, or holding circuits that drop out on power loss. The 400 V / 40 A rating on the description covers resistive and motor switching at that voltage level. The 24 V AC coil means it pulls from a control transformer, not a DC supply — verify your control voltage type before wiring. IP20 protection means it's safe from finger contact but not water ingress — strictly indoor panel use. The 71 mm depth and 90 mm height fit standard DIN-rail enclosures; the 54 mm width (3 MW) occupies three adjacent 18 mm module slots. ## Installation note — spacing matters Siemens explicitly requires spacers between adjacent units for heat dissipation. Plan for the extra width when laying out the panel. The 4 NC contacts can handle up to 4,000 W incandescent lamp load across the set.","metaTitle":"Siemens 5TT5843-2 SENTRON Insta Contactor, 4 NC, 24 V AC Coi","metaDescription":"Siemens 5TT5843-2 SENTRON insta contactor, 4 NC contacts, 24 V AC coil, 400 V 40 A rating. IP20, 3 MW. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"71 mm","Width":"54 mm","Height":"90 mm","Maximum":"440 V","Minimum":"440 V","Rated Value":"24 V","lifecycle_stage":"current","Installation Depth":"0 mm","Product Brand Name":"SENTRON","Product Designation":"Insta contactor","Rated Value Maximum":"24 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","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=341446&mlfb=5TT5843-2","alternativesUrl":"https://aoctrl.com/api/mcp/products/5TT5843-2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 5TT5843-2?","answer":"The Siemens 3RT7026-1AB05 is a contactor in the same general class but with 3 NO main contacts and 1 NC auxiliary contact — a fundamentally different contact arrangement. It will not drop into a panel wired for 4 NC without rewiring the load circuit."},{"question":"Does the 5TT5843-2 require any special mounting considerations?","answer":"Yes — Siemens specifies that spacers must be provided between adjacent units to ensure proper heat dissipation. The contactor dissipates 4 W per pole at rated current in hot operating state."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5843-2","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/5TT5843-2 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}}