{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5TT5851-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5TT5851-2","canonicalUrl":"https://aoctrl.com/siemens/5TT5851-2","factsUrl":"https://aoctrl.com/api/mcp/products/5TT5851-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON Insta contactor, 5TT5851-2, 3 NO + 1 NC contacts, 400V 63A, 24 V AC coil, 71 mm depth, 3 modular width units, IP20.","salesMarkdown":"The Siemens 5TT5851-2 is a SENTRON Insta contactor with a 24 V AC coil and a 3 NO + 1 NC contact arrangement, rated for 400V 63A main pole switching. ## Panel fit and heat management The 54 mm width (3 MW units) matches the common breaker footprint, so it rows cleanly alongside SENTRON MCBs. The 71 mm depth leaves clearance behind the mounting plate — no overhang issue. The critical detail: the spec explicitly requires spacers between adjacent units for heat dissipation. At 8 W per pole in hot state, stacking contactors without gaps will derate the assembly. Plan for a 1-module spacer or leave an empty slot between each 5TT5851-2 if you're grouping several. IP20 rated — fine for enclosed panels, not for washdown zones or outdoor cabinets without a secondary enclosure. ## What the contact arrangement means on the line The single normally-closed contact gives you a feedback or interlock path without adding an auxiliary block. The 5 000 W incandescent lamp rating confirms it handles the high inrush of cold filaments, so it's a fit for lighting contactor duty where incandescent or halogen loads are present.","metaTitle":"Siemens 5TT5851-2 SENTRON Insta Contactor, 24V AC Coil, 3NO+","metaDescription":"Siemens SENTRON 5TT5851-2 Insta contactor, 24 V AC coil, 400V 63A main poles, 3 NO + 1 NC contacts. Active production. Sourced to order against RFQ. 71 mm depth, 3 MW units.","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":"5 000 W","power loss [W] for rated value of the current at AC in hot operating state per pole":"8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/70064976fcade5c460bd327282199a84.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=270005&mlfb=5TT5851-2","alternativesUrl":"https://aoctrl.com/api/mcp/products/5TT5851-2/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5TT5851-2?","answer":"Submit an RFQ through our quoting system — we source the 5TT5851-2 to order and confirm current pricing and availability at the time of your request."},{"question":"Will 5TT5851-2 drop into a panel that was specified around 5SL4363-7 without rewiring?","answer":"No — the 5SL4363-7 is a miniature circuit breaker, not a contactor. They share the same 54 mm width (3 MW units) and SENTRON DIN-rail footprint, but the 5TT5851-2 is a contactor with a 24 V AC coil and power contacts, while the 5SL4363-7 is a protective device. The panel wiring and function are entirely different."},{"question":"What compliance documentation does this brand provide for 5TT5851-2?","answer":"As a Siemens SENTRON product, the 5TT5851-2 carries the manufacturer's standard declaration of conformity for CE marking and RoHS compliance. The specific certificate numbers and UL/CSA file listings are available with the product documentation upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5TT5851-2","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/5TT5851-2 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}}