{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5841-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5841-8","canonicalUrl":"https://aoctrl.com/siemens/5TT5841-8","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5841-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON Insta contactor, 5TT5841-8, 3 NO + 1 NC, 24 V AC coil, 400 V 40 A, IP20, 3 modular width units.","salesMarkdown":"The Siemens 5TT5841-8 is a SENTRON Insta contactor with 3 normally open and 1 normally closed contact, rated for 230 V AC control and switching 400 V at 40 A. Rated for 4 000 W incandescent lamp load, this contactor handles lighting circuits directly without an intermediate relay. ## Mounting and thermal considerations The manufacturer specifies that spacers must be provided between units to ensure heat dissipation. This is not optional — ganging multiple Insta contactors without the recommended air gap will raise the internal temperature above the rated operating condition and reduce service life. Plan for 3 MWU per device plus the spacer clearance. IP20 finger-safe protection means the contactor is intended for installation inside an enclosed panel or distribution box. The 5TT5841-8 carries an active lifecycle status from Siemens. It is a current-production part, not subject to phase-out or last-time-buy. For BOM planning, this means no requalification trigger from obsolescence — the part is a stable line item for serial production. Supplementary devices can be installed on the contactor, extending its functionality without replacing the base unit. This is useful when a field modification adds auxiliary contacts or a surge suppressor later in the machine life. ## Contact configuration and switching capacity Three NO main contacts and one NC auxiliary contact give the 5TT5841-8 a 3-pole switching capability plus a normally-closed feedback path. The NC contact can be wired as a status signal back to a PLC or as a holding-circuit interlock without adding an external auxiliary block. For a three-pole contactor carrying full load, that is 12 W total heat to dissipate inside the enclosure — another reason the spacer requirement matters for thermal management.","metaTitle":"Siemens 5TT5841-8 SENTRON Insta Contactor, 24 V AC Coil, 400","metaDescription":"Siemens 5TT5841-8 SENTRON Insta contactor, 3 NO + 1 NC contacts, 24 V AC coil, 400 V 40 A switching. Active production. IP20. 3 MW units. 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":"3 NO contacts 1 NC contact","number of NC contacts":"1","number of NO contacts":"3","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=481018&mlfb=5TT5841-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5TT5841-8/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of the 5TT5841-8?","answer":"Depth is 71 mm, width is 54 mm (3 modular width units), and height is 90 mm. Installation depth is 0 mm — the device sits flush on the DIN rail."},{"question":"What compliance documentation is available for the 5TT5841-8?","answer":"The part is a Siemens SENTRON product with standard CE marking for the European market. Specific RoHS, REACH, and UL documentation should be requested at RFQ time — the evidence does not list individual cert numbers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5841-8","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/5TT5841-8 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}}